Tsukuba Uchu Forum

122nd Uchu Forum

Molecular cloud collisions and machine learning

Image

Shinji Fujita

Osaka Prefecture University

Massive stars are very important for the physical and chemical evolution of the interstellar medium and the galaxy as a whole. The key to their formation is the accretion of mass onto their parent molecular cloud cores. In recent years, the rapid compression caused by supersonic collisions between molecular clouds...

121st Uchu Forum

On the Tidal Formation of Dark Matter Deficient Galaxies

Image

Go Ogiya

University of Waterloo

Recently, observations reported that the ultra diffuse galaxy NGC1052-DF2 (DF2), believed to be a member of the NGC1052 group, is dark matter (DM) deficient. Its inferred DM mass is smaller, by a factor of a few hundred, than what is expected based on its stellar mass and empirical models for...

120th Uchu Forum

Structure of the magnetic field driving active galactic nuclear jets probed by polarized light images

Image

Yu Tsuneto

Kyoto University

With the success of the Event Horizon Telescope in directly imaging a supermassive black hole, the study of black holes has entered a new era in which the properties of black holes are explored through imaging observations. In particular, the polarized images reveal the magnetic field structure near the black...

119th Uchu Forum

Identifying galactic structures in a galaxy more than 12 billion years ago using the gas dynamics

Image

Takafumi Tsukui

Sokendai

Spiral galaxies observed today (redshift z=0) have distinct internal structures: supper massive black hole (SMBH), dense stellar cluster known as bulge; a flat rotating disk; and extended dark matter halo. The cosmic averaged star formation is suggested to peak at z~2. It remains unclear when and how these structures formed...

118th Uchu Forum

A theoretical framework for cosmological analysis of 21-cm line observations

Image

Rika Ando

Nagoya University

Observations confirm that the universe is accelerating and expanding. Dark energy and modified gravity theories have been proposed but a conclusive theory remains elusive. The difference between these theoretical models is reflected in the magnitude of density fluctuations and the temporal evolution of large-scale structure. Therefore, it is possible to...

117th Uchu Forum

The Diversity of IGM-galaxy connection among galaxies at redshift z = 2-3

Image

Rieko Momose

University of Tokyo

The link between the intergalactic medium (IGM) and galaxies is key to understand the evolution of baryonic matter and galaxies. In fact, several observational studies have confirmed the connection between the IGM HI and galaxies up to several tens comoving Mpc. However, understanding the variations on the IGM-galaxy connection over...

116th Uchu Forum

Hybernating black holes: galaxy collisions and black hole activity

Image

Masao Mori

University of Tsukuba, Center for Computational Sciences

Supermassive black holes in the universe that exceed one million times the mass of the sun are ubiquitous in the universe. A small proportion of supermassive black holes shine brightly and show intense activity, using accreted matter as an energy source, but most black holes hybernate quietly in the center...

115th Uchu Forum

Supermassive black hole seed formation in the early universe

Image

Yuya Sakurai

IPMU

Recent three-dimensional cosmological simulations of protogalaxy formation have suggested that supermassive stars (SMSs) can form in warm gas clouds in which H2–cooling is overwhelmed by dynamical heating (Wise et al. 2019), but they stopped short of following the growth of a central protostar. Here we we examine whether accretion on...

114th Uchu Forum

Extracting information from emission line intensity maps using deep learning

Image

Moriwaki Kana

University of Tokyo

Observations of large-scale structure in the universe can place constraints on the theories of cosmology, galaxy formation, and reionization. A relatively new observation method called emission-line intensity mapping can reveal the three-dimensional distribution of galaxies and intergalactic gas over a wide area by analyzing the spatial fluctuations in emission line...

113th Uchu Forum

Exploring Molecular Clouds in our Galaxy with FUGIN

Image

Saito Hiro

University of Tsukuba

Molecular gas is a major component of the interstellar medium of the Milky Way Galaxy. Molecular cloud are the main environment in which stars form, so elucidating their spatial distribution and formation mechanism in the Galaxy is an important research field. Recent advances in interferometer observations have identified numerous macromolecular...

112th Uchu Forum

Supermassive star formation via super competitive accretion in slightly metal-enriched clouds

Image

Sunmyon Chon

Theoretical Astrophysics Group, University of Tohoku

Recent distant quasar surveys covering z > 6 have revealed a number of supermassive black holes (SMBH). One of the models for the formation of these SMBHs is the formation of supermassive stars (SMSs) in the early universe, leaving behind a seed BH after a "direct collaps". In gas clouds,...

111th Uchu Forum

New observational methods using hyperfine structure lines of the heavy elements of the Warm-Hot Intergalactic Medium

Image

Kohji Yoshikawa

University of Tsukuba

The observationally identifiable total mass of baryons in the present day universe is known to be significantly smaller than the mass derived from the cosmic microwave background radiation and neutral hydrogen absorption line studies of the distant universe. The unobserved baryons in the current universe are sometimes called dark baryons...

110th Uchu Forum

The growth of distant galaxies as seen by ALMA

Image

Takuya Hashimoto

University of Tsukuba

Observations of distant galaxies are important for (i) elucidating the evolution of galaxy formation, and (ii) understanding the contribution of galaxies to the reionization of the universe. In recent years, a number of candidate distant galaxies have been discovered by large ground-based telescopes and space telescopes, some of which have...

109th Uchu Forum

Molecular abundances in nearby galaxies (NGC 1068, NGC 253, and IC 342)

Image

Shuro Takano

Nihon University

The results from Nobeyama 45 m radio telescope observations of nearby galaxies NGC 1068, NGC 253, and IC 342 on the composition of the molecular gas will presented. NGC 1068 contains an active galactic nucleus (AGN), and the 45 m observations provide good spatial resolution to investigate the composition of...

108th Uchu Forum

Growth by Super-Eddington Accretion of Seed Black Holes in Primordial Galaxies

Image

Daisuke Toyouchi

University of Kyoto, Theoretical Astrophysics Group

Recent observations have revealed that giant black holes with masses of several hundred million times larger than the Sun already exist in the early universe at redshift z ~ 7. One of the leading theories for the formation of supermassive black holes in such an early universe is supercritical accretion...

107th Uchu Forum

The current status of galaxy formation at redshift 3

Image

Hideki Umehata

Riken

In the standard paradigm of coslmological large scale structure formation in Λ cold dark matter universe, dark matter and baryons gravitationally collapse into a spider web-like network called the cosmic web. In the current theoretical picture, gas inflow and accretion and galaxy formation progresses at the nodes of the cosmic...

106th Uchu Forum

Formation of multiple Pop III stars under radiation feedback

Image

Kazuyuki Sugimura

University of Maryland

Population III (Pop III) stars, forming as the first generation objects in the history of the Universe, bring an end to the dark age of the Universe and pollute the pristine intergalactic medium with heavy elements. Based on recent theoretical studies, there is general agreement that the typical mass scale...

105th Uchu Forum

A series of "most distant" results

Image

Akio Inoue

Waseda University

Recently, using Subaru and ALMA, we were able to make a series of press releases entitled “most distant XYZ”. That is, the most distant oxygen (2016.6), the most distant bright emission line (2018.5), the most distant galaxy merger (2019.6), the most distant passive galaxy (2019.9), and the most distant primitive...

104th Uchu Forum

New insights into the formation of massive galaxies and galaxy clusters in the early universe

Image

Tao Wang

University of Tsukuba, Center for Computatational Sciences

During the last decades, our understanding on both galaxy and structure formation in the nearby Universe has been great advanced, thanks to various large cosmological surveys. On the other hand, limited by the capabilities of current facilities, the early stages of both galaxy and structure formation are still not well...

103rd Uchu Forum

Gravitational instability and fragmentation of spiral arms

Image

Shigeki Inoue

University of Tsukuba, Center for Computatational Sciences

Spiral arms in a disc are structures found in various astronomical objects. Sometimes spiral arms fragment into smaller structures. In this study, the condition for gravitational instability of spiral arms was analytically derived by a linear perturbation analysis. Comparison with simulations confirmed that the analytical solutions can accurately predict the...

102nd Uchu Forum

Massive star formation through molecular cloud collisions and triggered star-formation through feedback

Image

Kazuhiro Shima

Kyoto University, Theoretical Astrophysics Group

In recent years, molecular cloud collisions have attracted attention as the formation process of massive stars and massive clusters. Takahira et al (2014) conducted three-dimensional fluid simulations in which two molecular clouds collide, and reported that a high density turbulent core exceeding 100 solar masses is formed. However, the models...

101st Uchu Forum

High-density gas formation and star formation in the Milky Way: The FUGIN project

Image

Nario Kuno

University of Tsukuba, Observational Astrophysics Group

The FUGIN project is a 12CO(J=1-0), 13CO(J=1-0), C18O(J=1-0) galactic plane survey using the 45 m Nobeyama Space Radio Observatory radio telescope. The goal is to understand the evolution of interstellar gas, e.g., molecular cloud formation, high density gas formation, and star formation in the Galaxy. Observation have been completed and...

100th Uchu Forum

Simulations of first galaxies formation: Toward a unified understanding of first stars and low-metalicity star cluster formation.

Image

Hidenobu Yajima

University of Tsukuba, CCS

With recent observational advances, many galaxies of redshift higher than 7 have been. The next generation observations, e.g. with the James Webb Space Telescope and TMT, the detection of first galaxies exceeding a redshift of 10 is expected. The first galaxies are not only important in understanding the galaxy evolution,...

99th Uchu Forum

AGN Feedback in Gas-Rich Galaxies

Image

Alexander Wagner

University of Tsukuba, CCS

The currently accepted theory of galaxy formation relies on a cycle of “feeding” and “feedback” between the central supermassive black hole and the galactic interstellar medium. The feedback cycle is likely most important at the peak of galaxy formation around redshifts of 2~3 during which galaxies are clumpy and gas-rich....

98th Uchu Forum

Polarization observations of protoplaneteray discs with ALMA

Image

Satoshi Ohashi

RIKEN, Star and Planet Formation Laboratory

近年,ALMA望遠鏡による高感度,高分解能観測によって原始惑星系円盤をこれまでにない解像度でイメージングし,リングやギャップ構造などの様々な特徴をもつ円盤を捉えてきた。 原始惑星系円盤において惑星が形成するためには,ダストを0.1 umサイズから1000 kmサイズへと10桁以上成長する過程を考えなければならない。そこで,原始惑星系円盤でどこでどのようにダスト成長が開始するのかを観測から明らかにすることが重要となる。 最近,偏光によってダストのサイズを見積もる方法が提唱されている(e.g., ...

97th Uchu Forum

Integrated perturbation theory and bias in large scale structure

Image

Takahiko Matsubara

High Energy Accelerator Research Organization (KEK)

The era of precision cosmology has fully matured. Recently, CMB observations by Planck showed that you can explain the universe surprisingly well with a standard Big Bang cosmology model, but many fundamental mysteries remain, such as the identity of dark matter and dark energy. At present, large galaxy surveys are...

96th Uchu Forum

CO Multi-line Imaging of Nearby Galaxies (COMING): molecular gas and star formation

Image

Kazuo Sorai

Hokkaido University and University of Tsukuba joint appointment

To understand star formation in galaxies, we need to understand the evolution of the gas from which the stars are born. However, due to technical restrictions on the observation of molecular spectral lines at millimeter wavelengths, observations of the resolved structure of molecular gas in galaxies have been limited. Using...

95th Uchu Forum

The Physics of Super-Eddington Accretion

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Ken Ohsuga

University of Tsukuba, Center for Computational Sciences

ブラックホール周囲の降着円盤は、活動銀河核やX線連星など、明るくコンパクトな天体のエネルギー源と考えられている。降着円盤理論の礎である標準円盤理論は、クェーサーやX線連星の熱的放射を見事に説明したことで広く知られるようになった。しかしながら、この理論モデルは質量降着率が大きい(エディントン降着率以上)状況で破綻することが知られている。このため、大きなエディントン比(光度/エディントン光度)を持つと考えられる超高光度X線源や一部の活動銀河核などを説明することができないという問題がある。エディント...

94th Uchu Forum

Opening the doors to Mars resource exploration business through Terahertz spectroscopy

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Yasuko Kasai

Terahertz Technology Research Center, National Institute of Information and Communications Technology (NICT)

近年、月面ビジネスが盛んになるなど、人類の活動の場は、地球近傍宇宙に広がっている。そのエネルギー源は水である。我々は、テラヘルツを用いることで10kg以下のセンサの超小型化を実現し、相乗り用小型火星探査機の開発を進めている。これにより、2年に一度、火星に探査機を飛ばし、水や酸素の探査を行うことを目標にしている。 ...

93rd Uchu Forum

New insights into galactic spiral arms: dynamic structure and observational signatures

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Keiichi Wada

University of Kagoshima

Textbooks attribute galactic spiral arms to "density waves", but theory suggests that it is difficult induce "stationary density waves in nature". In this presentation, I discuss based on numerical simulations, the physical mechanisms that produce spiral arms, and suggest observational signatures that can be used to differentiate different production mechanisms....

92nd Uchu Forum

Astrophysical turbulence - unraveling protoplanet formation

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Masayuki Umemura

University of Tsukuba, Center for Computational Sciences

固体(地球型)惑星の誕生は,ミクロンサイズのダストに始まり,これが付着成長してkmサイズの微惑星を作り,微惑星が合体して原始惑星を作り,最終的に惑星形成に至ると考えられている。しかしながら,原始惑星系円盤ガスとの摩擦により,ダストの付着成長過程において最短100年でダストが中心星に落下してしまうという問題(中心星落下問題)と,ダスト同士が衝突する際に付着せずに破壊してしまうという問題(衝突破壊問題)が指摘されており,固体微惑星形成問題はいまだに解決していない。中心星落下問題を切り抜けるメカニズ...

91st Uchu Forum

銀河における星形成則

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Nario Kuno

University of Tsukuba, Observational Astrophysics Group

星形成の材料となる星間ガスの量と星形成率の間の関係(星形成則)は、シュミット(1959)以来、多くの研究がなされてきた。最近では、CO(1-0)より高励起の輝線を用いたり、より星形成との関係が深い高密度ガスのトレーサーを用いた星形成則なども調べられるようになってきた。しかしながら、まだその関係を完全に理解するには至っていない。我々もいくつかの観点から銀河の星形成則を調べてきたので、この分野のレビューとともにその結果も紹介する。 ...

122nd Uchu Forum

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Molecular cloud collisions and machine learning

Shinji Fujita

Osaka Prefecture University

Massive stars are very important for the physical and chemical evolution of the interstellar medium and the galaxy as a whole. The key to their formation is the accretion of mass onto their parent molecular cloud cores. In recent years, the rapid compression caused by supersonic collisions between molecular clouds...

December 2021   13 : 30     molecular clouds, Milky Way, star formation, and machine learning
121st Uchu Forum

Image

On the Tidal Formation of Dark Matter Deficient Galaxies

Go Ogiya

University of Waterloo

Recently, observations reported that the ultra diffuse galaxy NGC1052-DF2 (DF2), believed to be a member of the NGC1052 group, is dark matter (DM) deficient. Its inferred DM mass is smaller, by a factor of a few hundred, than what is expected based on its stellar mass and empirical models for...

November 2021   12 : 30     dark matter, galaxy formation, N-body simulations, and globular clusters
120th Uchu Forum

Image

Structure of the magnetic field driving active galactic nuclear jets probed by polarized light images

Yu Tsuneto

Kyoto University

With the success of the Event Horizon Telescope in directly imaging a supermassive black hole, the study of black holes has entered a new era in which the properties of black holes are explored through imaging observations. In particular, the polarized images reveal the magnetic field structure near the black...

October 2021   13 : 30     black holes, AGN jets, Sgr*, radiative transfer, and general relativity
119th Uchu Forum

Image

Identifying galactic structures in a galaxy more than 12 billion years ago using the gas dynamics

Takafumi Tsukui

Sokendai

Spiral galaxies observed today (redshift z=0) have distinct internal structures: supper massive black hole (SMBH), dense stellar cluster known as bulge; a flat rotating disk; and extended dark matter halo. The cosmic averaged star formation is suggested to peak at z~2. It remains unclear when and how these structures formed...

September 2021   13 : 30     galaxy fromation, galactic disk, ALMA, and galactic halos
118th Uchu Forum

Image

A theoretical framework for cosmological analysis of 21-cm line observations

Rika Ando

Nagoya University

Observations confirm that the universe is accelerating and expanding. Dark energy and modified gravity theories have been proposed but a conclusive theory remains elusive. The difference between these theoretical models is reflected in the magnitude of density fluctuations and the temporal evolution of large-scale structure. Therefore, it is possible to...

July 2021   13 : 30     large scale structure, 21cm line, and N-body simulations
117th Uchu Forum

Image

The Diversity of IGM-galaxy connection among galaxies at redshift z = 2-3

Rieko Momose

University of Tokyo

The link between the intergalactic medium (IGM) and galaxies is key to understand the evolution of baryonic matter and galaxies. In fact, several observational studies have confirmed the connection between the IGM HI and galaxies up to several tens comoving Mpc. However, understanding the variations on the IGM-galaxy connection over...

June 2021   13 : 30     high-z galaxies, IGM, Lyman Alpha Forest, galaxy formation, and galaxy evolution
116th Uchu Forum

Image

Hybernating black holes: galaxy collisions and black hole activity

Masao Mori

University of Tsukuba, Center for Computational Sciences

Supermassive black holes in the universe that exceed one million times the mass of the sun are ubiquitous in the universe. A small proportion of supermassive black holes shine brightly and show intense activity, using accreted matter as an energy source, but most black holes hybernate quietly in the center...

May 2021   13 : 30     hydrodynamics, dusty torus, black holes, AGN, and galaxy mergers
115th Uchu Forum

Image

Supermassive black hole seed formation in the early universe

Yuya Sakurai

IPMU

Recent three-dimensional cosmological simulations of protogalaxy formation have suggested that supermassive stars (SMSs) can form in warm gas clouds in which H2–cooling is overwhelmed by dynamical heating (Wise et al. 2019), but they stopped short of following the growth of a central protostar. Here we we examine whether accretion on...

April 2021   13 : 30     first stars, large scale structure, and machine learning
114th Uchu Forum

Image

Extracting information from emission line intensity maps using deep learning

Moriwaki Kana

University of Tokyo

Observations of large-scale structure in the universe can place constraints on the theories of cosmology, galaxy formation, and reionization. A relatively new observation method called emission-line intensity mapping can reveal the three-dimensional distribution of galaxies and intergalactic gas over a wide area by analyzing the spatial fluctuations in emission line...

December 2020   13 : 30     cosmology, large scale structure, and machine learning
113th Uchu Forum

Image

Exploring Molecular Clouds in our Galaxy with FUGIN

Saito Hiro

University of Tsukuba

Molecular gas is a major component of the interstellar medium of the Milky Way Galaxy. Molecular cloud are the main environment in which stars form, so elucidating their spatial distribution and formation mechanism in the Galaxy is an important research field. Recent advances in interferometer observations have identified numerous macromolecular...

October 2020   13 : 30     molecular clouds and Milky Way
112th Uchu Forum

Image

Supermassive star formation via super competitive accretion in slightly metal-enriched clouds

Sunmyon Chon

Theoretical Astrophysics Group, University of Tohoku

Recent distant quasar surveys covering z > 6 have revealed a number of supermassive black holes (SMBH). One of the models for the formation of these SMBHs is the formation of supermassive stars (SMSs) in the early universe, leaving behind a seed BH after a "direct collaps". In gas clouds,...

July 2020   13 : 30     cosmological simulations and black holes
111th Uchu Forum

Image

New observational methods using hyperfine structure lines of the heavy elements of the Warm-Hot Intergalactic Medium

Kohji Yoshikawa

University of Tsukuba

The observationally identifiable total mass of baryons in the present day universe is known to be significantly smaller than the mass derived from the cosmic microwave background radiation and neutral hydrogen absorption line studies of the distant universe. The unobserved baryons in the current universe are sometimes called dark baryons...

June 2020   13 : 30     WHIM, galactic halos, cosmology, and galaxy clusters
110th Uchu Forum

Image

The growth of distant galaxies as seen by ALMA

Takuya Hashimoto

University of Tsukuba

Observations of distant galaxies are important for (i) elucidating the evolution of galaxy formation, and (ii) understanding the contribution of galaxies to the reionization of the universe. In recent years, a number of candidate distant galaxies have been discovered by large ground-based telescopes and space telescopes, some of which have...

May 2020   13 : 30     ALMA, molecular gas, and high-z galaxies
109th Uchu Forum

Image

Molecular abundances in nearby galaxies (NGC 1068, NGC 253, and IC 342)

Shuro Takano

Nihon University

The results from Nobeyama 45 m radio telescope observations of nearby galaxies NGC 1068, NGC 253, and IC 342 on the composition of the molecular gas will presented. NGC 1068 contains an active galactic nucleus (AGN), and the 45 m observations provide good spatial resolution to investigate the composition of...

February 2020   13 : 30     Nobeyama 45m radio telescope, ALMA, molecular gas, starbursts, and AGN
108th Uchu Forum

Image

Growth by Super-Eddington Accretion of Seed Black Holes in Primordial Galaxies

Daisuke Toyouchi

University of Kyoto, Theoretical Astrophysics Group

Recent observations have revealed that giant black holes with masses of several hundred million times larger than the Sun already exist in the early universe at redshift z ~ 7. One of the leading theories for the formation of supermassive black holes in such an early universe is supercritical accretion...

January 2020   13 : 30     black holes, first galaxies, accretion, and radiation hydrodynamics
107th Uchu Forum

Image

The current status of galaxy formation at redshift 3

Hideki Umehata

Riken

In the standard paradigm of coslmological large scale structure formation in Λ cold dark matter universe, dark matter and baryons gravitationally collapse into a spider web-like network called the cosmic web. In the current theoretical picture, gas inflow and accretion and galaxy formation progresses at the nodes of the cosmic...

December 2019   13 : 30     ALMA, galaxy formation, and high-z galaxies
106th Uchu Forum

Image

Formation of multiple Pop III stars under radiation feedback

Kazuyuki Sugimura

University of Maryland

Population III (Pop III) stars, forming as the first generation objects in the history of the Universe, bring an end to the dark age of the Universe and pollute the pristine intergalactic medium with heavy elements. Based on recent theoretical studies, there is general agreement that the typical mass scale...

November 2019   13 : 30     first stars, PopIII stars, radiative feedback, radiation hydrodynamics, and cosmological simulations
105th Uchu Forum

Image

A series of "most distant" results

Akio Inoue

Waseda University

Recently, using Subaru and ALMA, we were able to make a series of press releases entitled “most distant XYZ”. That is, the most distant oxygen (2016.6), the most distant bright emission line (2018.5), the most distant galaxy merger (2019.6), the most distant passive galaxy (2019.9), and the most distant primitive...

October 2019   13 : 30     galaxy formation and ALMA
104th Uchu Forum

Image

New insights into the formation of massive galaxies and galaxy clusters in the early universe

Tao Wang

University of Tsukuba, Center for Computatational Sciences

During the last decades, our understanding on both galaxy and structure formation in the nearby Universe has been great advanced, thanks to various large cosmological surveys. On the other hand, limited by the capabilities of current facilities, the early stages of both galaxy and structure formation are still not well...

September 2019   13 : 30     galaxy formation, ALMA, and cosmological simulations
103rd Uchu Forum

Image

Gravitational instability and fragmentation of spiral arms

Shigeki Inoue

University of Tsukuba, Center for Computatational Sciences

Spiral arms in a disc are structures found in various astronomical objects. Sometimes spiral arms fragment into smaller structures. In this study, the condition for gravitational instability of spiral arms was analytically derived by a linear perturbation analysis. Comparison with simulations confirmed that the analytical solutions can accurately predict the...

July 2019   13 : 30     galaxy formation, MHD, and galactic disk
102nd Uchu Forum

Image

Massive star formation through molecular cloud collisions and triggered star-formation through feedback

Kazuhiro Shima

Kyoto University, Theoretical Astrophysics Group

In recent years, molecular cloud collisions have attracted attention as the formation process of massive stars and massive clusters. Takahira et al (2014) conducted three-dimensional fluid simulations in which two molecular clouds collide, and reported that a high density turbulent core exceeding 100 solar masses is formed. However, the models...

June 2019   13 : 30     star formation, radiative transfer, and molecular clouds
101st Uchu Forum

Image

High-density gas formation and star formation in the Milky Way: The FUGIN project

Nario Kuno

University of Tsukuba, Observational Astrophysics Group

The FUGIN project is a 12CO(J=1-0), 13CO(J=1-0), C18O(J=1-0) galactic plane survey using the 45 m Nobeyama Space Radio Observatory radio telescope. The goal is to understand the evolution of interstellar gas, e.g., molecular cloud formation, high density gas formation, and star formation in the Galaxy. Observation have been completed and...

May 2019   13 : 30     star formation, observation, and molecular gas
100th Uchu Forum

Image

Simulations of first galaxies formation: Toward a unified understanding of first stars and low-metalicity star cluster formation.

Hidenobu Yajima

University of Tsukuba, CCS

With recent observational advances, many galaxies of redshift higher than 7 have been. The next generation observations, e.g. with the James Webb Space Telescope and TMT, the detection of first galaxies exceeding a redshift of 10 is expected. The first galaxies are not only important in understanding the galaxy evolution,...

April 2019   15 : 00     PopIII stars, James Webb, TMT, radiation hydrodynamics, and cosmological simulations
99th Uchu Forum

Image

AGN Feedback in Gas-Rich Galaxies

Alexander Wagner

University of Tsukuba, CCS

The currently accepted theory of galaxy formation relies on a cycle of “feeding” and “feedback” between the central supermassive black hole and the galactic interstellar medium. The feedback cycle is likely most important at the peak of galaxy formation around redshifts of 2~3 during which galaxies are clumpy and gas-rich....

January 2019   13 : 30     radio galaxies, relativistic jets, and AGN feedback
98th Uchu Forum

Image

Polarization observations of protoplaneteray discs with ALMA

Satoshi Ohashi

RIKEN, Star and Planet Formation Laboratory

近年,ALMA望遠鏡による高感度,高分解能観測によって原始惑星系円盤をこれまでにない解像度でイメージングし,リングやギャップ構造などの様々な特徴をもつ円盤を捉えてきた。 原始惑星系円盤において惑星が形成するためには,ダストを0.1 umサイズから1000 kmサイズへと10桁以上成長する過程を考えなければならない。そこで,原始惑星系円盤でどこでどのようにダスト成長が開始するのかを観測から明らかにすることが重要となる。 最近,偏光によってダストのサイズを見積もる方法が提唱されている(e.g., ...

December 2018   13 : 30     ALMA and protoplanetary discs
97th Uchu Forum

Image

Integrated perturbation theory and bias in large scale structure

Takahiko Matsubara

High Energy Accelerator Research Organization (KEK)

The era of precision cosmology has fully matured. Recently, CMB observations by Planck showed that you can explain the universe surprisingly well with a standard Big Bang cosmology model, but many fundamental mysteries remain, such as the identity of dark matter and dark energy. At present, large galaxy surveys are...

October 2018   13 : 30    
96th Uchu Forum

Image

CO Multi-line Imaging of Nearby Galaxies (COMING): molecular gas and star formation

Kazuo Sorai

Hokkaido University and University of Tsukuba joint appointment

To understand star formation in galaxies, we need to understand the evolution of the gas from which the stars are born. However, due to technical restrictions on the observation of molecular spectral lines at millimeter wavelengths, observations of the resolved structure of molecular gas in galaxies have been limited. Using...

September 2018   13 : 30    
95th Uchu Forum

Image

The Physics of Super-Eddington Accretion

Ken Ohsuga

University of Tsukuba, Center for Computational Sciences

ブラックホール周囲の降着円盤は、活動銀河核やX線連星など、明るくコンパクトな天体のエネルギー源と考えられている。降着円盤理論の礎である標準円盤理論は、クェーサーやX線連星の熱的放射を見事に説明したことで広く知られるようになった。しかしながら、この理論モデルは質量降着率が大きい(エディントン降着率以上)状況で破綻することが知られている。このため、大きなエディントン比(光度/エディントン光度)を持つと考えられる超高光度X線源や一部の活動銀河核などを説明することができないという問題がある。エディント...

July 2018   13 : 30    
94th Uchu Forum

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Opening the doors to Mars resource exploration business through Terahertz spectroscopy

Yasuko Kasai

Terahertz Technology Research Center, National Institute of Information and Communications Technology (NICT)

近年、月面ビジネスが盛んになるなど、人類の活動の場は、地球近傍宇宙に広がっている。そのエネルギー源は水である。我々は、テラヘルツを用いることで10kg以下のセンサの超小型化を実現し、相乗り用小型火星探査機の開発を進めている。これにより、2年に一度、火星に探査機を飛ばし、水や酸素の探査を行うことを目標にしている。 ...

June 2018   13 : 30    
93rd Uchu Forum

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New insights into galactic spiral arms: dynamic structure and observational signatures

Keiichi Wada

University of Kagoshima

Textbooks attribute galactic spiral arms to "density waves", but theory suggests that it is difficult induce "stationary density waves in nature". In this presentation, I discuss based on numerical simulations, the physical mechanisms that produce spiral arms, and suggest observational signatures that can be used to differentiate different production mechanisms....

May 2018   13 : 30    
92nd Uchu Forum

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Astrophysical turbulence - unraveling protoplanet formation

Masayuki Umemura

University of Tsukuba, Center for Computational Sciences

固体(地球型)惑星の誕生は,ミクロンサイズのダストに始まり,これが付着成長してkmサイズの微惑星を作り,微惑星が合体して原始惑星を作り,最終的に惑星形成に至ると考えられている。しかしながら,原始惑星系円盤ガスとの摩擦により,ダストの付着成長過程において最短100年でダストが中心星に落下してしまうという問題(中心星落下問題)と,ダスト同士が衝突する際に付着せずに破壊してしまうという問題(衝突破壊問題)が指摘されており,固体微惑星形成問題はいまだに解決していない。中心星落下問題を切り抜けるメカニズ...

April 2018   13 : 30    
91st Uchu Forum

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銀河における星形成則

Nario Kuno

University of Tsukuba, Observational Astrophysics Group

星形成の材料となる星間ガスの量と星形成率の間の関係(星形成則)は、シュミット(1959)以来、多くの研究がなされてきた。最近では、CO(1-0)より高励起の輝線を用いたり、より星形成との関係が深い高密度ガスのトレーサーを用いた星形成則なども調べられるようになってきた。しかしながら、まだその関係を完全に理解するには至っていない。我々もいくつかの観点から銀河の星形成則を調べてきたので、この分野のレビューとともにその結果も紹介する。 ...

July 2017   13 : 30     star formation, observation, and molecular gas

122nd Uchu Forum Molecular cloud collisions and machine learning

Shinji Fujita (Osaka Prefecture University)
December 2021   13 : 30     molecular clouds, Milky Way, star formation, and machine learning

121st Uchu Forum On the Tidal Formation of Dark Matter Deficient Galaxies

Go Ogiya (University of Waterloo)
November 2021   12 : 30     dark matter, galaxy formation, N-body simulations, and globular clusters

120th Uchu Forum Structure of the magnetic field driving active galactic nuclear jets probed by polarized light images

Yu Tsuneto (Kyoto University)
October 2021   13 : 30     black holes, AGN jets, Sgr*, radiative transfer, and general relativity

119th Uchu Forum Identifying galactic structures in a galaxy more than 12 billion years ago using the gas dynamics

Takafumi Tsukui (Sokendai)
September 2021   13 : 30     galaxy fromation, galactic disk, ALMA, and galactic halos

118th Uchu Forum A theoretical framework for cosmological analysis of 21-cm line observations

Rika Ando (Nagoya University)
July 2021   13 : 30     large scale structure, 21cm line, and N-body simulations

117th Uchu Forum The Diversity of IGM-galaxy connection among galaxies at redshift z = 2-3

Rieko Momose (University of Tokyo)
June 2021   13 : 30     high-z galaxies, IGM, Lyman Alpha Forest, galaxy formation, and galaxy evolution

116th Uchu Forum Hybernating black holes: galaxy collisions and black hole activity

Masao Mori (University of Tsukuba, Center for Computational Sciences)
May 2021   13 : 30     hydrodynamics, dusty torus, black holes, AGN, and galaxy mergers

115th Uchu Forum Supermassive black hole seed formation in the early universe

Yuya Sakurai (IPMU)
April 2021   13 : 30     first stars, large scale structure, and machine learning

114th Uchu Forum Extracting information from emission line intensity maps using deep learning

Moriwaki Kana (University of Tokyo)
December 2020   13 : 30     cosmology, large scale structure, and machine learning

113th Uchu Forum Exploring Molecular Clouds in our Galaxy with FUGIN

Saito Hiro (University of Tsukuba)
October 2020   13 : 30     molecular clouds and Milky Way

112th Uchu Forum Supermassive star formation via super competitive accretion in slightly metal-enriched clouds

Sunmyon Chon (Theoretical Astrophysics Group, University of Tohoku)
July 2020   13 : 30     cosmological simulations and black holes

111th Uchu Forum New observational methods using hyperfine structure lines of the heavy elements of the Warm-Hot Intergalactic Medium

Kohji Yoshikawa (University of Tsukuba)
June 2020   13 : 30     WHIM, galactic halos, cosmology, and galaxy clusters

110th Uchu Forum The growth of distant galaxies as seen by ALMA

Takuya Hashimoto (University of Tsukuba)
May 2020   13 : 30     ALMA, molecular gas, and high-z galaxies

109th Uchu Forum Molecular abundances in nearby galaxies (NGC 1068, NGC 253, and IC 342)

Shuro Takano (Nihon University)
February 2020   13 : 30     Nobeyama 45m radio telescope, ALMA, molecular gas, starbursts, and AGN

108th Uchu Forum Growth by Super-Eddington Accretion of Seed Black Holes in Primordial Galaxies

Daisuke Toyouchi (University of Kyoto, Theoretical Astrophysics Group)
January 2020   13 : 30     black holes, first galaxies, accretion, and radiation hydrodynamics

107th Uchu Forum The current status of galaxy formation at redshift 3

Hideki Umehata (Riken)
December 2019   13 : 30     ALMA, galaxy formation, and high-z galaxies

106th Uchu Forum Formation of multiple Pop III stars under radiation feedback

Kazuyuki Sugimura (University of Maryland)
November 2019   13 : 30     first stars, PopIII stars, radiative feedback, radiation hydrodynamics, and cosmological simulations

105th Uchu Forum A series of "most distant" results

Akio Inoue (Waseda University)
October 2019   13 : 30     galaxy formation and ALMA

104th Uchu Forum New insights into the formation of massive galaxies and galaxy clusters in the early universe

Tao Wang (University of Tsukuba, Center for Computatational Sciences)
September 2019   13 : 30     galaxy formation, ALMA, and cosmological simulations

103rd Uchu Forum Gravitational instability and fragmentation of spiral arms

Shigeki Inoue (University of Tsukuba, Center for Computatational Sciences)
July 2019   13 : 30     galaxy formation, MHD, and galactic disk

102nd Uchu Forum Massive star formation through molecular cloud collisions and triggered star-formation through feedback

Kazuhiro Shima (Kyoto University, Theoretical Astrophysics Group)
June 2019   13 : 30     star formation, radiative transfer, and molecular clouds

101st Uchu Forum High-density gas formation and star formation in the Milky Way: The FUGIN project

Nario Kuno (University of Tsukuba, Observational Astrophysics Group)
May 2019   13 : 30     star formation, observation, and molecular gas

100th Uchu Forum Simulations of first galaxies formation: Toward a unified understanding of first stars and low-metalicity star cluster formation.

Hidenobu Yajima (University of Tsukuba, CCS)
April 2019   15 : 00     PopIII stars, James Webb, TMT, radiation hydrodynamics, and cosmological simulations

99th Uchu Forum AGN Feedback in Gas-Rich Galaxies

Alexander Wagner (University of Tsukuba, CCS)
January 2019   13 : 30     radio galaxies, relativistic jets, and AGN feedback

98th Uchu Forum Polarization observations of protoplaneteray discs with ALMA

Satoshi Ohashi (RIKEN, Star and Planet Formation Laboratory)
December 2018   13 : 30     ALMA and protoplanetary discs

97th Uchu Forum Integrated perturbation theory and bias in large scale structure

Takahiko Matsubara (High Energy Accelerator Research Organization (KEK))
October 2018   13 : 30    

96th Uchu Forum CO Multi-line Imaging of Nearby Galaxies (COMING): molecular gas and star formation

Kazuo Sorai (Hokkaido University and University of Tsukuba joint appointment)
September 2018   13 : 30    

95th Uchu Forum The Physics of Super-Eddington Accretion

Ken Ohsuga (University of Tsukuba, Center for Computational Sciences)
July 2018   13 : 30    

94th Uchu Forum Opening the doors to Mars resource exploration business through Terahertz spectroscopy

Yasuko Kasai (Terahertz Technology Research Center, National Institute of Information and Communications Technology (NICT))
June 2018   13 : 30    

93rd Uchu Forum New insights into galactic spiral arms: dynamic structure and observational signatures

Keiichi Wada (University of Kagoshima)
May 2018   13 : 30    

92nd Uchu Forum Astrophysical turbulence - unraveling protoplanet formation

Masayuki Umemura (University of Tsukuba, Center for Computational Sciences)
April 2018   13 : 30    

91st Uchu Forum 銀河における星形成則

Nario Kuno (University of Tsukuba, Observational Astrophysics Group)
July 2017   13 : 30     star formation, observation, and molecular gas

90th Uchu Forum 銀河スケールのダークマターハローのスケーリング則について

Masao Mori (University of Tsukuba, Theoretical Astrophysics Group)
June 2017   13 : 30     dark matter and dwarf galaxies

89th Uchu Forum Interstellar molecular composition on molecular cloud scale

Yoshimasa Watanabe (University of Tsukuba, Radio Astronomy Laboratory)
May 2017   13 : 30     radio observations and molecular clouds

88th Uchu Forum 連星の形成と質量降着

Toru Tsuribe (Ibaraki University)
April 2017   13 : 30     numerical simulations, hydrodynamics, and molecular cores

87th Uchu Forum SCF法による無衝突恒星系のシミュレーション

Shunsuke Hozumi (University of Shiga)
March 2017   13 : 30     numerical simulations, self-gravitating systems, and collisionless systems

86th Uchu Forum 長波長非線形揺らぎから探る初期宇宙モデル

Yuichi Takamizu (University of Tsukuba, theoretical astrophysics group)
January 2017   13 : 30     cosmology, inflation, general relativity, and early universe

85th Uchu Forum 色等級図と金属量分布から探る矮小銀河の化学進化

Hidetomo Honma (NAOJ)
December 2016   13 : 30     dwarf galaxies, galaxy evolution, and star formation

84th Uchu Forum High resolution observations of protoplanetary disks with ALMA ~ Signs of protoplanets in a disk ? ~

Munetake Momose (Radio astronomy, Ibaraki University)
November 2016   15 : 00     radio observations, ALMA, protoplanetary discs, and exoplanets

83rd Uchu Forum 宇宙論的銀河形成シミュレーションで探る遠方銀河の形態獲得プロセスと形成期銀河円盤の力学不安定性解析

Shigeki Inoue (KAVLI INSTITUTE FOR THE PHYSICS AND MATHEMATICS OF THE UNIVERSE)
October 2016   13 : 30     numerical simulations, cosmology, galactic disk, galaxy formation, and high-z galaxies

82nd Uchu Forum Rotation Curve of M33 Explained by Disc Dark Matter

Toshio Fukushima (National Astronomical Observatory of Japan (NAOJ))
July 2016   15 : 00     numerical simulations, observations, M33, galactic disk, and dark matter

81st Uchu Forum 初代星の最大質量と超巨大ブラックホールの起源

Takashi Hosokawa (The University of Tokyo Theoretical Astrophysics)
June 2016   13 : 30     first stars, SMBH, and numerical simulations

80th Uchu Forum Water trail from molecular clouds to protoplanetary disks

Kenji Furuya (University of Tsukuba, Center for Computational Sciences)
May 2016   13 : 30     numerical simulations, molecular clouds, protostellar discs, and chemodynamics

79th Uchu Forum Gravitational wave event GW150914 - initial masses and merging conditions

Masayuki Umemura (University of Tsukuba, Center for Computational Sciences)
April 2016   13 : 30     SMBH, SMBH binaries, SMBH mergers, gravitational waves, observations, N-body simulations, and numerical simulations

78th Uchu Forum 大規模探査で迫る巨大ブラックホール進化

Toru Nagao (Research Center for Space and Cosmic Evolution, Ehime University)
February 2016   16 : 45     SMBH

77th Uchu Forum 活動銀河核アウトフローの輻射流体シミュレーション

Mariko Nomura (University of Tsukuba, Center for Computational Sciences, Theoretical Astrophysics Group)
January 2016   13 : 30     AGN

76th Uchu Forum ダスト観測による高赤方偏移銀河の探査

Naomasa Nakai (University of Tsukuba, Radio Astronomy Laboratory)
December 2015   13 : 30     First star

75th Uchu Forum The evolution of the mass functions of active supermassive black holes and their host galaxies out to z~2

Andreas Schulze (Kavli IPMU)
November 2015   13 : 30     quasars, black holes, and galaxy evolution

74th Uchu Forum Studying the nature of Dark Matter with nearby dwarf galaxies

Kohei Hayahsi (Kavli IPMU)
October 2015   13 : 30     dark matter and dwarf galaxies

73rd Uchu Forum Collisionless Weibel shocks and electron acceleration in gamma-ray bursts

Kazem Ardaneh (Department of Computer Science, University of Tsukuba)
September 2015   13 : 30     GRB

72nd Uchu Forum Development of a Wide-Field Camera containing Microwave Kinetic Inductance Detectors

Tomu Nitta (University of Tsukuba)
July 2015   13 : 30     radio observation

71st Uchu Forum 波長~1mmの 高感度-高分解能観測で見えてくる近傍銀河の新たな姿

Kazushi Sakamoto (Academia Sinica Institute of Astronomy and Astrophysics (ASIAA))
June 2015   13 : 30     molecular gas and radio observation

70th Uchu Forum Astrochemisry of Water

Yuri Aikawa (University of Tsukuba, Center for Computational Sciences, Theoretical Astrophysics Group)
May 2015   15 : 00    

69th Uchu Forum 銀河の渦状構造

Nario Kuno (University of Tsukuba, Radio Astronomy Laboratory)
April 2015   13 : 30     galaxy formation and star formation

68th Uchu Forum Terahertz absorption and synchrotron radiation circular dichroism spectroscopy of biological organic molecules

Jun-ichi Takahashi (Osaka University Institute of Laser Engineering)
March 2015   10 : 00     amino acids

67th Uchu Forum Determination of distances to galaxies using masers

Naomasa Nakai (University of Tsukuba, Radio Astronomy Laboratory)
January 2015   13 : 30     AGN and masers

66th Uchu Forum CO imaging study of merger remnants

Junko Ueda (NAOJ)
December 2014   13 : 30     SMBH, galaxy evolution, alma, and galaxy mergers

65th Uchu Forum Vlasov-Poisson Simulations of Neutrinos in Cosmological Large Scale Structure Formation

Kohji Yoshikawa (University of Tsukuba)
November 2014   15 : 00     Vlasov-Poisson simulations and numerical simulations

64th Uchu Forum The environments of giant Ly-alpha blobs, traced by wide-field Ly-alpha imaging

Tomoki Saito (ICRR)
October 2014   13 : 30     Lyman Alpha Blobs and LAE

63rd Uchu Forum 回転駆動型パルサー磁気圏の粒子加速機構

Tomohide Wada (Tsukuba University of Technology)
July 2014   13 : 30     pulsars, particle acceleration, and visualization

62nd Uchu Forum 銀河における星間ガスの進化と星形成の観測的研究

Nario Kuno (University of Tsukuba, Observational Astrophysics Group)
June 2014   13 : 30     star formation, GMC, and radio observations

61st Uchu Forum 微惑星形成と原始惑星系円盤の乱流

Satoshi Okuzumi (Tokyo Institute of Technology)
May 2014   13 : 30     planet formation, protoplanetary discs, turbulence, and MRI

60th Uchu Forum 銀河スケールのダークマターハローの構造及び銀河の形成・進化

Masao Mori (University of Tsukuba, theoretical astrophysics group)
April 2014   13 : 30     dark matter and galactic halos

59th Uchu Forum CMBで探る宇宙論の現状と地上観測実験POLARBEARの最新結果

Tomotake Matsumura (KEK)
March 2014   13 : 30     CMB, cosmology, and inflation

58th Uchu Forum 中性子星連星の合体と電磁波対応天体

Masaru Shibata (Kyoto University)
January 2014   13 : 30     gravitational waves

57th Uchu Forum 21cm線放射の観測によるニュートリノ質量階層構造の制限

Yoshihiko Ohyama (KEK)
December 2013   13 : 30     neutrinos and 21cm line

56th Uchu Forum 高赤方偏移宇宙の輝線銀河観測:Lya輝線銀河から[CII]輝線銀河へ

Yuichi Matsuda (NAOJ, Chili observatory)
November 2013   13 : 30     LAE, morphology-density relation, ALMA, and submm galaxies

55th Uchu Forum Multi-parameterization of the Star Formation Law; Discovery of the Fundamental Plane of the ISM

Shinya Komugi (NAOJ, Chili observatory)
October 2013   13 : 30     star formation, GMC, and M33

54th Uchu Forum 太陽系外惑星の直接観測に向けたバイナリ瞳マスク・コロナグラフの開発

Kanae Haze (JAXA)
September 2013   13 : 30     exoplanets and coronagraphs

53rd Uchu Forum (Part2) Radiation transfer models to interpret the Lyman-apha properties of high-redshift galaxies

Anne Verhamme (Geneva Observatory)
July 2013   13 : 30     high-z galaxies, galaxy formation, galaxy evolution, and LAE

53rd Uchu Forum (Part1) Exploring the Cosmic Dawn by Deep ALMA and HST Observations

Masami Ouchi (Institute for Cosmic Ray Research, University of Tokyo)
July 2013   13 : 30     high-z galaxies, galaxy formation, reionization, ALMA, HST, and Subaru

52nd Uchu Forum WISE衛星を用いた活動銀河核ダストトーラスの光度および赤方偏移依存性の検証

Yoshiki Toba (SOKENDAI, ISAS/JAXA)
June 2013   13 : 30     AGN and dusty torus

51st Uchu Forum Lyα輝線銀河探査で探る宇宙再電離

Takatoshi Shibuya (University of Tsukuba, theoretical astrophysics group / Institute for Cosmic Ray Research, University of Tokyo)
May 2013   13 : 30     LAE, reionization, and Subaru

50th Uchu Forum 次世代位置天文学観測による太陽系付近の局所暗黒物質密度の決定

Shigeki Inoue (KASI)
April 2013   13 : 30     astrometry, dark matter, and Gaia

49th Uchu Forum 天文学における基礎物理定数の観測

Shinichi Ohshima ()
March 2013   13 : 30     physical constants

48th Uchu Forum COSMIC DUST AND COSMOLOGICAL STAR FORMATION PROCESS

Daisuke Yamasawa (Hokkaido University)
February 2013   13 : 30     semi-analytic models, reionization, dust, and star formation

47th Uchu Forum Size Evolution of Early-Type Galaxies through Dry Mergers

Taira Oogi (Hokkaido University)
January 2013   13 : 30     early type galaxies and galaxy mergers

46th Uchu Forum 宇宙生命計算科学 -生体アミノ酸カイラリティ宇宙起源の検証に向けて-

Masayuki Umemura (University of Tsukuba, Center for Computational Sciences)
December 2012   13 : 30     amino acids and TDDFT

45th Uchu Forum New results of the QUIET experiment

Makoto Nagai (University of Tsukuba, Radio Astronomy Laboratory)
November 2012   13 : 30     CMB and B-mode polarization

44th Uchu Forum Effects of Galaxy Interactions on Molecular Gas Properties and Star Formation

Hiroyuki Kaneko (University of Tsukuba, Radio Astronomy Laboratory)
October 2012   13 : 30     galaxy interactions, molecular gas, and star formation

43rd Uchu Forum ガンマ線バーストの次なる革命

Kunihito Ioka (KEK)
September 2012   13 : 30     GRB

42nd Uchu Forum Transient Sources of Ultra-high-energy Cosmic Rays and their Observational Evidence

Hajime Takami (KEK)
July 2012   13 : 30     UHECR and transients

41st Uchu Forum SKA計画で探る宇宙磁場のファラデー回転

Takuya Akahori (KASI)
June 2012   13 : 30     intergalactic magnetic fields, Faraday rotation, and SKA

40th Uchu Forum ニュートリノ輻射輸送を伴う超新星爆発の3Dシミュレーション

Tomoya Takiwaki (National Astronomical Observatory of Japan, Division of Theoretical Astronomy)
May 2012   13 : 30     supernovae, neutrinos, and numerical simulations

39th Uchu Forum 6次元位相空間上でのVlasov-Poisson方程式系の直接数値計算による無衝突自己重力系の数値シミュレーション

Kohji Yoshikawa (University of Tsukuba, theoretical astrophysics group)
April 2012   13 : 30     Vlasov-Poisson simulations and numerical simulations

38th Uchu Forum 宇宙赤外線背景放射の観測による宇宙初期の探査 ~ロケット実験CIBERの最近の成果から

Shuji Matsuura (JAXA/ISAS)
March 2012   13 : 45     CIB, cosmology, and galaxy formation

37th Uchu Forum アンモニア分子輝線で探る分子雲の物理状態

Masumichi Seta (University of Tsukuba, Radio Astronomy Laboratory)
February 2012   13 : 30     GMC and radio observations

36th Uchu Forum アンドロメダの涙とリング

Masao Mori (University of Tsukuba, theoretical astrophysics group)
January 2012   13 : 30     Andromeda, galaxy evolution, and galaxy mergers

35th Uchu Forum ニュートリノの速度の測定について

Naomasa Nakai (University of Tsukuba, Radio Astronomy Laboratory)
December 2011   13 : 30     neutrinos and physical constants

34th Uchu Forum 宇宙磁場の起源

Keitaro Takahashi (Kumamoto University)
November 2011   13 : 30     cosmic magnetic fields and SKA

33rd Uchu Forum 宇宙再電離シミュレーション

Kenji Hasegawa (University of Tsukuba, theoretical astrophysics group)
October 2011   13 : 30     reionization, radiative transfer, and radiative feedback

32nd Uchu Forum Clustered Star Formation in Dense Clumps of Molecular Clouds

Fumitaka Nakamura (National Astronomical Observatory of Japan, Division of Theoretical Astronomy)
September 2011   13 : 30     star formation and MHD

31st Uchu Forum Relativistic Jet Feedback in Radio Galaxies

Alex Wagner (University of Tsukuba, theoretical astrophysics group)
July 2011   13 : 30     radio galaxies, relativistic jets, and AGN feedback

30th Uchu Forum 初代星形成の輻射流体力学過程

Masayuki Umemura (Theoretical Astrophysics Group, University of Tsukuba)
June 2011   13 : 30     first stars, hydrodynamics, numerical simulation, PopIII stars, radiative transfer, and star formation

29th Uchu Forum すばるで探る再電離期の宇宙

Masami Ouchi (ICRR, University of Tokyo)
May 2011   13 : 30     galaxy evolution, high-z galaxies, reionization, and LAE

28th Uchu Forum 銀河系中心領域へのガス供給と銀河系中心での星形成について

Daisuke Namekata (Theoretical Astrophysics Group, University of Tsukuba)
April 2011   13 : 30     galaxy formation, galaxy evolution, star formation, Galactic center, and hydrodyanmics

27th Uchu Forum 渦状腕構造の正体

Junichi Baba (NAOJ)
February 2011   13 : 30     galaxy evolution, galaxy formation, and numerical simulations

26th Uchu Forum 超新星残骸からの宇宙線の逃走

Yutaka Ohira (KEK)
January 2011   13 : 30     supernova remnants, supernova, and UHECR

25th Uchu Forum Once upon a time in Andromeda

Masao Mori 氏 (University of Tsukuba, theoretical astrophysics group)
December 2010   13 : 30     Andromeda and observations

24th Uchu Forum 銀河の暗黒物質

Masashi Chiba (Tohoku University Astronomical Institute)
November 2010   13 : 30     dark matter and galaxy formation

23rd Uchu Forum 南極ドームふじ基地における電波天文学

Seta Masumichi 氏 (University of Tsukuba, Radio Astronomy Laboratory)
October 2010   13 : 30     radio observations

22nd Uchu Forum Gaia 時代の銀河系考古学

Daisuke Kawata (Mullard, Space Science Laboratory, University College London)
September 2010   13 : 30     observations and Milky Way

21st Uchu Forum 天体起源の宇宙線電子・陽電子について

Norita Kawanaka (KEK)
July 2010   13 : 30     UHECR

20th Uchu Forum The role of environment on the mass buildup of supermassive black holes

John Silverman (Kavli IPMU)
June 2010   13 : 30     AGN and galaxy evolution

19th Uchu Forum Suynaev-Zel'dovich Effect in Merging Galaxy Clusters

Kohji Yoshikawa (University of Tsukuba, Center for Computational Sciences)
May 2010   13 : 30     galaxy clusters, CMB, cosmology, and observation

18th Uchu Forum ブラックホールへのガス降着現象

Toshihiro Kawaguchi (University of Tsukuba, Center for Computational Sciences)
April 2010   13 : 30     AGN, SMBH, and accretion discs

17th Uchu Forum 地球質量ダークマターマイクロハローの形成・進化

Tomoaki Ishiyama (NAOJ, Division of Theoretical Astronomy)
February 2010   13 : 30     dark matter, cosmology, N-body simulations, and numerical simulations

16th Uchu Forum ガス降着による超巨大ブラックホール形成理論構築に向けて

Nozomu Kawakatsu (University of Tsukuba, Center for Computational Sciences)
January 2010   13 : 30     SMBH

15th Uchu Forum Steps towards PopIII Stellar IMF

Masayuki Umemura (University of Tsukuba)
December 2009   13 : 30     first stars, hydrodynamics, and numerical simulations

14th Uchu Forum ブラックホールの鼓動からスピンを測定する

Yoshiaki Kato (JAXA)
November 2009   13 : 30     black holes and accretion discs

13th Uchu Forum 太陽圏外圏の構造とダイナミックス -- ヴォイジャー観測を基礎にして

Haruichi Washimi (CSPAR, University of Alabama in Huntsvile)
October 2009   13 : 30     solar wind and MHD

12th Uchu Forum 定在降着衝撃波不安定性の数値流体解析と重力崩壊型超新星爆発への応用

Junichi Sato (cea)
September 2009   13 : 30     supernovae and numerical simulations

11th Uchu Forum 星形成過程でのジェットとアウトフロー現象の解明

Masahiro Machida (Kyoto University)
June 2009   13 : 30     star formation, protostars, MHD, and GMC

10th Uchu Forum 銀河衝突におけるスターバーストと星団形成

Takayuki Saitoh (NAOJ, Division of Theoretical Astronomy)
May 2009   13 : 30     star formation and galaxy formation

9th Uchu Forum 水素分子の観測

Naomasa Nakai (University of Tsukuba)
March 2009   13 : 30     GMC and star formation

8th Uchu Forum 初期練成を含む星団の力学進化

Ataru Tanikawa (NAOJ)
February 2009   13 : 30     globular clusters

7th Uchu Forum First Cosmic Light

Andrea Ferrara (Scuola Normale Superiore)
January 2009   13 : 30     first stars

6th Uchu Forum 水素分子の観測

Naomasa Nakai (University of Tsukuba)
December 2008   13 : 30     GMC and star formation

5th Uchu Forum The Making of The First Stars

Naoki Yoshida (IPMU)
November 2008   13 : 30     first stars, hydrodynamics, and radiative transfer

4th Uchu Forum Warm-Hot Intergalactic Medium as Missing Baryon

Kohji Yoshikawa (University of Tsukuba)
October 2008   13 : 30     cosmology, WHIM, and numerical simulations

3rd Uchu Forum 宇宙背景放射(CMB)偏光観測

Masashi Hazumi (KEK)
September 2008   13 : 30     cosmology, CMB, and gravitational waves

2nd Uchu Forum 銀河系中心領域における高速度分子ガス

Makoto Nagai (University of Tsukuba)
July 2008   13 : 30     GMC and CMZ

1st Uchu Forum Constructing a new magnetic reconnection model - beyond the Petschek model

Shinya Nitta (Tsukuba University of Technology)
May 2008   13 : 30     MHD, accretion discs, and galaxy clusters
  1. Molecular cloud collisions and machine learning, Shinji Fujita (Osaka Prefecture University)   December 2021  
  2. On the Tidal Formation of Dark Matter Deficient Galaxies, Go Ogiya (University of Waterloo)   November 2021  
  3. Structure of the magnetic field driving active galactic nuclear jets probed by polarized light images, Yu Tsuneto (Kyoto University)   October 2021  
  4. Identifying galactic structures in a galaxy more than 12 billion years ago using the gas dynamics, Takafumi Tsukui (Sokendai)   September 2021  
  5. A theoretical framework for cosmological analysis of 21-cm line observations, Rika Ando (Nagoya University)   July 2021  
  6. The Diversity of IGM-galaxy connection among galaxies at redshift z = 2-3, Rieko Momose (University of Tokyo)   June 2021  
  7. Hybernating black holes: galaxy collisions and black hole activity, Masao Mori (University of Tsukuba, Center for Computational Sciences)   May 2021  
  8. Supermassive black hole seed formation in the early universe, Yuya Sakurai (IPMU)   April 2021  
  9. Extracting information from emission line intensity maps using deep learning, Moriwaki Kana (University of Tokyo)   December 2020  
  10. Exploring Molecular Clouds in our Galaxy with FUGIN, Saito Hiro (University of Tsukuba)   October 2020  
  11. Supermassive star formation via super competitive accretion in slightly metal-enriched clouds, Sunmyon Chon (Theoretical Astrophysics Group, University of Tohoku)   July 2020  
  12. New observational methods using hyperfine structure lines of the heavy elements of the Warm-Hot Intergalactic Medium, Kohji Yoshikawa (University of Tsukuba)   June 2020  
  13. The growth of distant galaxies as seen by ALMA, Takuya Hashimoto (University of Tsukuba)   May 2020  
  14. Molecular abundances in nearby galaxies (NGC 1068, NGC 253, and IC 342), Shuro Takano (Nihon University)   February 2020  
  15. Growth by Super-Eddington Accretion of Seed Black Holes in Primordial Galaxies, Daisuke Toyouchi (University of Kyoto, Theoretical Astrophysics Group)   January 2020  
  16. The current status of galaxy formation at redshift 3, Hideki Umehata (Riken)   December 2019  
  17. Formation of multiple Pop III stars under radiation feedback, Kazuyuki Sugimura (University of Maryland)   November 2019  
  18. A series of "most distant" results, Akio Inoue (Waseda University)   October 2019  
  19. New insights into the formation of massive galaxies and galaxy clusters in the early universe, Tao Wang (University of Tsukuba, Center for Computatational Sciences)   September 2019  
  20. Gravitational instability and fragmentation of spiral arms, Shigeki Inoue (University of Tsukuba, Center for Computatational Sciences)   July 2019  
  21. Massive star formation through molecular cloud collisions and triggered star-formation through feedback, Kazuhiro Shima (Kyoto University, Theoretical Astrophysics Group)   June 2019  
  22. High-density gas formation and star formation in the Milky Way: The FUGIN project, Nario Kuno (University of Tsukuba, Observational Astrophysics Group)   May 2019  
  23. Simulations of first galaxies formation: Toward a unified understanding of first stars and low-metalicity star cluster formation., Hidenobu Yajima (University of Tsukuba, CCS)   April 2019  
  24. AGN Feedback in Gas-Rich Galaxies, Alexander Wagner (University of Tsukuba, CCS)   January 2019  
  25. Polarization observations of protoplaneteray discs with ALMA, Satoshi Ohashi (RIKEN, Star and Planet Formation Laboratory)   December 2018  
  26. Integrated perturbation theory and bias in large scale structure, Takahiko Matsubara (High Energy Accelerator Research Organization (KEK))   October 2018  
  27. CO Multi-line Imaging of Nearby Galaxies (COMING): molecular gas and star formation, Kazuo Sorai (Hokkaido University and University of Tsukuba joint appointment)   September 2018  
  28. The Physics of Super-Eddington Accretion, Ken Ohsuga (University of Tsukuba, Center for Computational Sciences)   July 2018  
  29. Opening the doors to Mars resource exploration business through Terahertz spectroscopy, Yasuko Kasai (Terahertz Technology Research Center, National Institute of Information and Communications Technology (NICT))   June 2018  
  30. New insights into galactic spiral arms: dynamic structure and observational signatures, Keiichi Wada (University of Kagoshima)   May 2018  
  31. Astrophysical turbulence - unraveling protoplanet formation, Masayuki Umemura (University of Tsukuba, Center for Computational Sciences)   April 2018  
  32. 銀河における星形成則, Nario Kuno (University of Tsukuba, Observational Astrophysics Group)   July 2017  
  33. 銀河スケールのダークマターハローのスケーリング則について, Masao Mori (University of Tsukuba, Theoretical Astrophysics Group)   June 2017  
  34. Interstellar molecular composition on molecular cloud scale, Yoshimasa Watanabe (University of Tsukuba, Radio Astronomy Laboratory)   May 2017  
  35. 連星の形成と質量降着, Toru Tsuribe (Ibaraki University)   April 2017  
  36. SCF法による無衝突恒星系のシミュレーション, Shunsuke Hozumi (University of Shiga)   March 2017  
  37. 長波長非線形揺らぎから探る初期宇宙モデル, Yuichi Takamizu (University of Tsukuba, theoretical astrophysics group)   January 2017  
  38. 色等級図と金属量分布から探る矮小銀河の化学進化, Hidetomo Honma (NAOJ)   December 2016  
  39. High resolution observations of protoplanetary disks with ALMA ~ Signs of protoplanets in a disk ? ~, Munetake Momose (Radio astronomy, Ibaraki University)   November 2016  
  40. 宇宙論的銀河形成シミュレーションで探る遠方銀河の形態獲得プロセスと形成期銀河円盤の力学不安定性解析, Shigeki Inoue (KAVLI INSTITUTE FOR THE PHYSICS AND MATHEMATICS OF THE UNIVERSE)   October 2016  
  41. Rotation Curve of M33 Explained by Disc Dark Matter, Toshio Fukushima (National Astronomical Observatory of Japan (NAOJ))   July 2016  
  42. 初代星の最大質量と超巨大ブラックホールの起源, Takashi Hosokawa (The University of Tokyo Theoretical Astrophysics)   June 2016  
  43. Water trail from molecular clouds to protoplanetary disks, Kenji Furuya (University of Tsukuba, Center for Computational Sciences)   May 2016  
  44. Gravitational wave event GW150914 - initial masses and merging conditions, Masayuki Umemura (University of Tsukuba, Center for Computational Sciences)   April 2016  
  45. 大規模探査で迫る巨大ブラックホール進化, Toru Nagao (Research Center for Space and Cosmic Evolution, Ehime University)   February 2016  
  46. 活動銀河核アウトフローの輻射流体シミュレーション, Mariko Nomura (University of Tsukuba, Center for Computational Sciences, Theoretical Astrophysics Group)   January 2016  
  47. ダスト観測による高赤方偏移銀河の探査, Naomasa Nakai (University of Tsukuba, Radio Astronomy Laboratory)   December 2015  
  48. The evolution of the mass functions of active supermassive black holes and their host galaxies out to z~2, Andreas Schulze (Kavli IPMU)   November 2015  
  49. Studying the nature of Dark Matter with nearby dwarf galaxies, Kohei Hayahsi (Kavli IPMU)   October 2015  
  50. Collisionless Weibel shocks and electron acceleration in gamma-ray bursts, Kazem Ardaneh (Department of Computer Science, University of Tsukuba)   September 2015  
  51. Development of a Wide-Field Camera containing Microwave Kinetic Inductance Detectors, Tomu Nitta (University of Tsukuba)   July 2015  
  52. 波長~1mmの 高感度-高分解能観測で見えてくる近傍銀河の新たな姿, Kazushi Sakamoto (Academia Sinica Institute of Astronomy and Astrophysics (ASIAA))   June 2015  
  53. Astrochemisry of Water, Yuri Aikawa (University of Tsukuba, Center for Computational Sciences, Theoretical Astrophysics Group)   May 2015  
  54. 銀河の渦状構造, Nario Kuno (University of Tsukuba, Radio Astronomy Laboratory)   April 2015  
  55. Terahertz absorption and synchrotron radiation circular dichroism spectroscopy of biological organic molecules, Jun-ichi Takahashi (Osaka University Institute of Laser Engineering)   March 2015  
  56. Determination of distances to galaxies using masers, Naomasa Nakai (University of Tsukuba, Radio Astronomy Laboratory)   January 2015  
  57. CO imaging study of merger remnants, Junko Ueda (NAOJ)   December 2014  
  58. Vlasov-Poisson Simulations of Neutrinos in Cosmological Large Scale Structure Formation, Kohji Yoshikawa (University of Tsukuba)   November 2014  
  59. The environments of giant Ly-alpha blobs, traced by wide-field Ly-alpha imaging, Tomoki Saito (ICRR)   October 2014  
  60. 回転駆動型パルサー磁気圏の粒子加速機構, Tomohide Wada (Tsukuba University of Technology)   July 2014  
  61. 銀河における星間ガスの進化と星形成の観測的研究, Nario Kuno (University of Tsukuba, Observational Astrophysics Group)   June 2014  
  62. 微惑星形成と原始惑星系円盤の乱流, Satoshi Okuzumi (Tokyo Institute of Technology)   May 2014  
  63. 銀河スケールのダークマターハローの構造及び銀河の形成・進化, Masao Mori (University of Tsukuba, theoretical astrophysics group)   April 2014  
  64. CMBで探る宇宙論の現状と地上観測実験POLARBEARの最新結果, Tomotake Matsumura (KEK)   March 2014  
  65. 中性子星連星の合体と電磁波対応天体, Masaru Shibata (Kyoto University)   January 2014  
  66. 21cm線放射の観測によるニュートリノ質量階層構造の制限, Yoshihiko Ohyama (KEK)   December 2013  
  67. 高赤方偏移宇宙の輝線銀河観測:Lya輝線銀河から[CII]輝線銀河へ, Yuichi Matsuda (NAOJ, Chili observatory)   November 2013  
  68. Multi-parameterization of the Star Formation Law; Discovery of the Fundamental Plane of the ISM, Shinya Komugi (NAOJ, Chili observatory)   October 2013  
  69. 太陽系外惑星の直接観測に向けたバイナリ瞳マスク・コロナグラフの開発, Kanae Haze (JAXA)   September 2013  
  70. Radiation transfer models to interpret the Lyman-apha properties of high-redshift galaxies, Anne Verhamme (Geneva Observatory)   July 2013  
  71. Lyα輝線銀河探査で探る宇宙再電離, Takatoshi Shibuya (University of Tsukuba, theoretical astrophysics group / Institute for Cosmic Ray Research, University of Tokyo)   May 2013  
  72. 次世代位置天文学観測による太陽系付近の局所暗黒物質密度の決定, Shigeki Inoue (KASI)   April 2013  
  73. 天文学における基礎物理定数の観測, Shinichi Ohshima ()   March 2013  
  74. COSMIC DUST AND COSMOLOGICAL STAR FORMATION PROCESS, Daisuke Yamasawa (Hokkaido University)   February 2013  
  75. Size Evolution of Early-Type Galaxies through Dry Mergers, Taira Oogi (Hokkaido University)   January 2013  
  76. 宇宙生命計算科学 -生体アミノ酸カイラリティ宇宙起源の検証に向けて-, Masayuki Umemura (University of Tsukuba, Center for Computational Sciences)   December 2012  
  77. New results of the QUIET experiment, Makoto Nagai (University of Tsukuba, Radio Astronomy Laboratory)   November 2012  
  78. Effects of Galaxy Interactions on Molecular Gas Properties and Star Formation, Hiroyuki Kaneko (University of Tsukuba, Radio Astronomy Laboratory)   October 2012  
  79. ガンマ線バーストの次なる革命, Kunihito Ioka (KEK)   September 2012  
  80. Transient Sources of Ultra-high-energy Cosmic Rays and their Observational Evidence, Hajime Takami (KEK)   July 2012  
  81. SKA計画で探る宇宙磁場のファラデー回転, Takuya Akahori (KASI)   June 2012  
  82. ニュートリノ輻射輸送を伴う超新星爆発の3Dシミュレーション, Tomoya Takiwaki (National Astronomical Observatory of Japan, Division of Theoretical Astronomy)   May 2012  
  83. 6次元位相空間上でのVlasov-Poisson方程式系の直接数値計算による無衝突自己重力系の数値シミュレーション, Kohji Yoshikawa (University of Tsukuba, theoretical astrophysics group)   April 2012  
  84. 宇宙赤外線背景放射の観測による宇宙初期の探査 ~ロケット実験CIBERの最近の成果から, Shuji Matsuura (JAXA/ISAS)   March 2012  
  85. アンモニア分子輝線で探る分子雲の物理状態, Masumichi Seta (University of Tsukuba, Radio Astronomy Laboratory)   February 2012  
  86. アンドロメダの涙とリング, Masao Mori (University of Tsukuba, theoretical astrophysics group)   January 2012  
  87. ニュートリノの速度の測定について, Naomasa Nakai (University of Tsukuba, Radio Astronomy Laboratory)   December 2011  
  88. 宇宙磁場の起源, Keitaro Takahashi (Kumamoto University)   November 2011  
  89. 宇宙再電離シミュレーション, Kenji Hasegawa (University of Tsukuba, theoretical astrophysics group)   October 2011  
  90. Clustered Star Formation in Dense Clumps of Molecular Clouds, Fumitaka Nakamura (National Astronomical Observatory of Japan, Division of Theoretical Astronomy)   September 2011  
  91. Relativistic Jet Feedback in Radio Galaxies, Alex Wagner (University of Tsukuba, theoretical astrophysics group)   July 2011  
  92. 初代星形成の輻射流体力学過程, Masayuki Umemura (Theoretical Astrophysics Group, University of Tsukuba)   June 2011  
  93. すばるで探る再電離期の宇宙, Masami Ouchi (ICRR, University of Tokyo)   May 2011  
  94. 銀河系中心領域へのガス供給と銀河系中心での星形成について, Daisuke Namekata (Theoretical Astrophysics Group, University of Tsukuba)   April 2011  
  95. 渦状腕構造の正体, Junichi Baba (NAOJ)   February 2011  
  96. 超新星残骸からの宇宙線の逃走, Yutaka Ohira (KEK)   January 2011  
  97. Once upon a time in Andromeda, Masao Mori 氏 (University of Tsukuba, theoretical astrophysics group)   December 2010  
  98. 銀河の暗黒物質, Masashi Chiba (Tohoku University Astronomical Institute)   November 2010  
  99. 南極ドームふじ基地における電波天文学, Seta Masumichi 氏 (University of Tsukuba, Radio Astronomy Laboratory)   October 2010  
  100. Gaia 時代の銀河系考古学, Daisuke Kawata (Mullard, Space Science Laboratory, University College London)   September 2010  
  101. 天体起源の宇宙線電子・陽電子について, Norita Kawanaka (KEK)   July 2010  
  102. The role of environment on the mass buildup of supermassive black holes, John Silverman (Kavli IPMU)   June 2010  
  103. Suynaev-Zel'dovich Effect in Merging Galaxy Clusters, Kohji Yoshikawa (University of Tsukuba, Center for Computational Sciences)   May 2010  
  104. ブラックホールへのガス降着現象, Toshihiro Kawaguchi (University of Tsukuba, Center for Computational Sciences)   April 2010  
  105. 地球質量ダークマターマイクロハローの形成・進化, Tomoaki Ishiyama (NAOJ, Division of Theoretical Astronomy)   February 2010  
  106. ガス降着による超巨大ブラックホール形成理論構築に向けて, Nozomu Kawakatsu (University of Tsukuba, Center for Computational Sciences)   January 2010  
  107. Steps towards PopIII Stellar IMF, Masayuki Umemura (University of Tsukuba)   December 2009  
  108. ブラックホールの鼓動からスピンを測定する, Yoshiaki Kato (JAXA)   November 2009  
  109. 太陽圏外圏の構造とダイナミックス -- ヴォイジャー観測を基礎にして, Haruichi Washimi (CSPAR, University of Alabama in Huntsvile)   October 2009  
  110. 定在降着衝撃波不安定性の数値流体解析と重力崩壊型超新星爆発への応用, Junichi Sato (cea)   September 2009  
  111. 星形成過程でのジェットとアウトフロー現象の解明, Masahiro Machida (Kyoto University)   June 2009  
  112. 銀河衝突におけるスターバーストと星団形成, Takayuki Saitoh (NAOJ, Division of Theoretical Astronomy)   May 2009  
  113. 水素分子の観測, Naomasa Nakai (University of Tsukuba)   March 2009  
  114. 初期練成を含む星団の力学進化, Ataru Tanikawa (NAOJ)   February 2009  
  115. First Cosmic Light, Andrea Ferrara (Scuola Normale Superiore)   January 2009  
  116. 水素分子の観測, Naomasa Nakai (University of Tsukuba)   December 2008  
  117. The Making of The First Stars, Naoki Yoshida (IPMU)   November 2008  
  118. Warm-Hot Intergalactic Medium as Missing Baryon, Kohji Yoshikawa (University of Tsukuba)   October 2008  
  119. 宇宙背景放射(CMB)偏光観測, Masashi Hazumi (KEK)   September 2008  
  120. 銀河系中心領域における高速度分子ガス, Makoto Nagai (University of Tsukuba)   July 2008  
  121. Constructing a new magnetic reconnection model - beyond the Petschek model, Shinya Nitta (Tsukuba University of Technology)   May 2008