研究成果・発表論文

First-principles study of the formation of glycine-producing radicals from common interstellar species

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Sato, Akimasa,   Kitazawa, Yuya,   Ochi, Toshiro,   Shoji, Mitsuo,   Komatsu, Yu,   Kayanuma, Megumi

Glycine, the simplest amino acid, has been intensively searched for in molecular clouds, and the comprehensive clarification of the formation path of interstellar glycine is now imperative. Among all the possible glycine formation pathways, we focuse...

Systematic Identification of LAEs for Visible Exploration and Reionization Research Using Subaru HSC (SILVERRUSH). I. Program strategy and clustering properties of ̃2000 Ly\ensuremathα emitters at z = 6-7 over the 0.3-0.5 Gpc$^2$ survey area

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Ouchi, Masami,   Harikane, Yuichi,   Shibuya, Takatoshi,   Shimasaku, Kazuhiro,   Taniguchi, Yoshiaki,   Konno, Akira

We present the SILVERRUSH program strategy and clustering properties investigated with ̃2000 Ly\ensuremathα emitters (LAEs) at z = 5.7 and 6.6 found in the early data of the Hyper Suprime- Cam (HSC) Subaru Strategic Program survey exploiting the care...

Ionized Gas Outflows in Infrared-bright Dust-obscured Galaxies Selected with WISE and SDSS

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Toba, Yoshiki,   Bae, Hyun-Jin,   Nagao, Tohru,   Woo, Jong-Hak,   Wang, Wei-Hao,   Wagner, Alexander Y.

We present the ionized gas properties of infrared (IR)-bright dust- obscured galaxies (DOGs) that show an extreme optical/IR color, \(i-[22])\$_\AB$\> 7.0, selected with the Sloan Digital Sky Survey (SDSS) and Wide-field Infrared Survey Explorer (...

Multidimensional Vlasov-Poisson Simulations with High-order Monotonicity- and Positivity-preserving Schemes

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Tanaka, Satoshi,   Yoshikawa, Kohji,   Minoshima, Takashi,   Yoshida, Naoki

We develop new numerical schemes for Vlasov-Poisson equations with high- order accuracy. Our methods are based on a spatially monotonicity-preserving (MP) scheme and are modified suitably so that the positivity of the distribution function is also pr...

A theoretical study of the formation of glycine via hydantoin intermediate in outer space environment

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Kayanuma, Megumi,   Kidachi, Kaori,   Shoji, Mitsuo,   Komatsu, Yu,   Sato, Akimasa,   Shigeta, Yasuteru

As a possible formation mechanism of glycine in astrophysical environments, a reaction path via aminoacetonitrile and hydantoin (2,4-imidazolidinedione), which have been detected in an interstellar cloud and meteorites, respectively, were analyzed us...

ALMA Observations of the Protostar L1527 IRS: Probing Details of the Disk and the Envelope Structures

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Aso, Yusuke,   Ohashi, Nagayoshi,   Aikawa, Yuri,   Machida, Masahiro N.,   Saigo, Kazuya,   Saito, Masao

We have recently observed the Class 0/I protostar L1527 IRS using the Atacama Large Millimeter/submillimeter Array (ALMA) during its Cycle 1 in 220 GHz dust continuum and C$^18$O (J=2-1) line emissions with a ̃2 times higher angular resolution (̃ 0\t...

Complex organics in IRAS 4A revisited with ALMA and PdBI: Striking contrast between two neighbouring protostellar cores

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López-Sepulcre, A.,   Sakai, N.,   Neri, R.,   Imai, M.,   Oya, Y.,   Ceccarelli, C.

Context. Hot corinos are extremely rich in complex organic molecules (COMs). Accurate abundance measurements of COMs in such objects are crucial to constrain astrochemical models. In the particular case of close binary systems this can only be achiev...

The Formation and Physical Origin of Highly Ionized Cooling Gas

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Bordoloi, Rongmon,   Wagner, Alexander Y.,   Heckman, Timothy M.,   Norman, Colin A.

We present a simple model that explains the origin of warm, diffuse gas seen primarily as highly ionized absorption-line systems in the spectra of background sources. We predict the observed column densities of several highly ionized transitions such...

The nature of the progenitor of the M31 north-western stream: globular clusters as milestones of its orbit

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Kirihara, T.,   Miki, Y.,   Mori, M.

We examine the nature, possible orbits and physical properties of the progenitor of the north-western stellar stream (NWS) in the halo of the Andromeda galaxy (M31). The progenitor is assumed to be an accreting dwarf galaxy with globular clusters (GC...

Universal Dark Halo Scaling Relation for the Dwarf Spheroidal Satellites

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Hayashi, Kohei,   Ishiyama, Tomoaki,   Ogiya, Go,   Chiba, Masashi,   Inoue, Shigeki,   Mori, Masao

Motivated by a recently found interesting property of the dark halo surface density within a radius, \r\$_\max $, giving the maximum circular velocity, \V\$_\max $, we investigate it for dark halos of the Milky Way\textquoterights and Andromeda\textq...

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First-principles study of the formation of glycine-producing radicals from common interstellar species

Sato, Akimasa,   Kitazawa, Yuya,   Ochi, Toshiro,   Shoji, Mitsuo,   Komatsu, Yu,   Kayanuma, Megumi

Glycine, the simplest amino acid, has been intensively searched for in molecular clouds, and the comprehensive clarification of the formation path of interstellar glycine is now imperative. Among all the possible glycine formation pathways, we focuse...

平成30年 3月  
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Multiple Paths of Deuterium Fractionation in Protoplanetary Disks

Aikawa, Yuri,   Furuya, Kenji,   Hincelin, Ugo,   Herbst, Eric

We investigate deuterium chemistry coupled with the nuclear spin-state chemistry of H$_2$ and \\\H\\\$_3$$^+$ in protoplanetary disks. Multiple paths of deuterium fractionation are found; exchange reactions with D atoms, such as HCO$^+$ + D, are effe...

平成30年 3月   The Astrophysical Journal
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Systematic Identification of LAEs for Visible Exploration and Reionization Research Using Subaru HSC (SILVERRUSH). I. Program strategy and clustering properties of ̃2000 Ly\ensuremathα emitters at z = 6-7 over the 0.3-0.5 Gpc$^2$ survey area

Ouchi, Masami,   Harikane, Yuichi,   Shibuya, Takatoshi,   Shimasaku, Kazuhiro,   Taniguchi, Yoshiaki,   Konno, Akira

We present the SILVERRUSH program strategy and clustering properties investigated with ̃2000 Ly\ensuremathα emitters (LAEs) at z = 5.7 and 6.6 found in the early data of the Hyper Suprime- Cam (HSC) Subaru Strategic Program survey exploiting the care...

平成30年 1月   Publications of the Astronomical Society of Japan
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Ionized Gas Outflows in Infrared-bright Dust-obscured Galaxies Selected with WISE and SDSS

Toba, Yoshiki,   Bae, Hyun-Jin,   Nagao, Tohru,   Woo, Jong-Hak,   Wang, Wei-Hao,   Wagner, Alexander Y.

We present the ionized gas properties of infrared (IR)-bright dust- obscured galaxies (DOGs) that show an extreme optical/IR color, \(i-[22])\$_\AB$\> 7.0, selected with the Sloan Digital Sky Survey (SDSS) and Wide-field Infrared Survey Explorer (...

平成29年 12月   The Astrophysical Journal
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Multidimensional Vlasov-Poisson Simulations with High-order Monotonicity- and Positivity-preserving Schemes

Tanaka, Satoshi,   Yoshikawa, Kohji,   Minoshima, Takashi,   Yoshida, Naoki

We develop new numerical schemes for Vlasov-Poisson equations with high- order accuracy. Our methods are based on a spatially monotonicity-preserving (MP) scheme and are modified suitably so that the positivity of the distribution function is also pr...

平成29年 11月   The Astrophysical Journal
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A theoretical study of the formation of glycine via hydantoin intermediate in outer space environment

Kayanuma, Megumi,   Kidachi, Kaori,   Shoji, Mitsuo,   Komatsu, Yu,   Sato, Akimasa,   Shigeta, Yasuteru

As a possible formation mechanism of glycine in astrophysical environments, a reaction path via aminoacetonitrile and hydantoin (2,4-imidazolidinedione), which have been detected in an interstellar cloud and meteorites, respectively, were analyzed us...

平成29年 11月  
Image

ALMA Observations of the Protostar L1527 IRS: Probing Details of the Disk and the Envelope Structures

Aso, Yusuke,   Ohashi, Nagayoshi,   Aikawa, Yuri,   Machida, Masahiro N.,   Saigo, Kazuya,   Saito, Masao

We have recently observed the Class 0/I protostar L1527 IRS using the Atacama Large Millimeter/submillimeter Array (ALMA) during its Cycle 1 in 220 GHz dust continuum and C$^18$O (J=2-1) line emissions with a ̃2 times higher angular resolution (̃ 0\t...

平成29年 11月   The Astrophysical Journal
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Complex organics in IRAS 4A revisited with ALMA and PdBI: Striking contrast between two neighbouring protostellar cores

López-Sepulcre, A.,   Sakai, N.,   Neri, R.,   Imai, M.,   Oya, Y.,   Ceccarelli, C.

Context. Hot corinos are extremely rich in complex organic molecules (COMs). Accurate abundance measurements of COMs in such objects are crucial to constrain astrochemical models. In the particular case of close binary systems this can only be achiev...

平成29年 10月  
Image

The Formation and Physical Origin of Highly Ionized Cooling Gas

Bordoloi, Rongmon,   Wagner, Alexander Y.,   Heckman, Timothy M.,   Norman, Colin A.

We present a simple model that explains the origin of warm, diffuse gas seen primarily as highly ionized absorption-line systems in the spectra of background sources. We predict the observed column densities of several highly ionized transitions such...

平成29年 10月   The Astrophysical Journal
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The nature of the progenitor of the M31 north-western stream: globular clusters as milestones of its orbit

Kirihara, T.,   Miki, Y.,   Mori, M.

We examine the nature, possible orbits and physical properties of the progenitor of the north-western stellar stream (NWS) in the halo of the Andromeda galaxy (M31). The progenitor is assumed to be an accreting dwarf galaxy with globular clusters (GC...

平成29年 8月   Monthly Notices of the Royal Astronomical Society
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Universal Dark Halo Scaling Relation for the Dwarf Spheroidal Satellites

Hayashi, Kohei,   Ishiyama, Tomoaki,   Ogiya, Go,   Chiba, Masashi,   Inoue, Shigeki,   Mori, Masao

Motivated by a recently found interesting property of the dark halo surface density within a radius, \r\$_\max $, giving the maximum circular velocity, \V\$_\max $, we investigate it for dark halos of the Milky Way\textquoterights and Andromeda\textq...

平成29年 7月   The Astrophysical Journal
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NH$_3$ (1$_0$-0$_0$) in the pre-stellar core L1544

Caselli, P.,   Bizzocchi, L.,   Keto, E.,   Sipilä, O.,   Tafalla, M.,   Pagani, L.

Pre-stellar cores represent the initial conditions in the process of star and planet formation, therefore it is important to study their physical and chemical structure. Because of their volatility, nitrogen-bearing molecules are key to study the den...

平成29年 7月  

First-principles study of the formation of glycine-producing radicals from common interstellar species

Sato, Akimasa,   Kitazawa, Yuya,   Ochi, Toshiro,   Shoji, Mitsuo,   Komatsu, Yu,   Kayanuma, Megumi
平成30年 3月  

Multiple Paths of Deuterium Fractionation in Protoplanetary Disks

Aikawa, Yuri,   Furuya, Kenji,   Hincelin, Ugo,   Herbst, Eric
平成30年 3月   The Astrophysical Journal

Systematic Identification of LAEs for Visible Exploration and Reionization Research Using Subaru HSC (SILVERRUSH). I. Program strategy and clustering properties of ̃2000 Ly\ensuremathα emitters at z = 6-7 over the 0.3-0.5 Gpc$^2$ survey area

Ouchi, Masami,   Harikane, Yuichi,   Shibuya, Takatoshi,   Shimasaku, Kazuhiro,   Taniguchi, Yoshiaki,   Konno, Akira
平成30年 1月   Publications of the Astronomical Society of Japan

Ionized Gas Outflows in Infrared-bright Dust-obscured Galaxies Selected with WISE and SDSS

Toba, Yoshiki,   Bae, Hyun-Jin,   Nagao, Tohru,   Woo, Jong-Hak,   Wang, Wei-Hao,   Wagner, Alexander Y.
平成29年 12月   The Astrophysical Journal

Multidimensional Vlasov-Poisson Simulations with High-order Monotonicity- and Positivity-preserving Schemes

Tanaka, Satoshi,   Yoshikawa, Kohji,   Minoshima, Takashi,   Yoshida, Naoki
平成29年 11月   The Astrophysical Journal

A theoretical study of the formation of glycine via hydantoin intermediate in outer space environment

Kayanuma, Megumi,   Kidachi, Kaori,   Shoji, Mitsuo,   Komatsu, Yu,   Sato, Akimasa,   Shigeta, Yasuteru
平成29年 11月  

ALMA Observations of the Protostar L1527 IRS: Probing Details of the Disk and the Envelope Structures

Aso, Yusuke,   Ohashi, Nagayoshi,   Aikawa, Yuri,   Machida, Masahiro N.,   Saigo, Kazuya,   Saito, Masao
平成29年 11月   The Astrophysical Journal

Complex organics in IRAS 4A revisited with ALMA and PdBI: Striking contrast between two neighbouring protostellar cores

López-Sepulcre, A.,   Sakai, N.,   Neri, R.,   Imai, M.,   Oya, Y.,   Ceccarelli, C.
平成29年 10月  

The Formation and Physical Origin of Highly Ionized Cooling Gas

Bordoloi, Rongmon,   Wagner, Alexander Y.,   Heckman, Timothy M.,   Norman, Colin A.
平成29年 10月   The Astrophysical Journal

The nature of the progenitor of the M31 north-western stream: globular clusters as milestones of its orbit

Kirihara, T.,   Miki, Y.,   Mori, M.
平成29年 8月   Monthly Notices of the Royal Astronomical Society

Universal Dark Halo Scaling Relation for the Dwarf Spheroidal Satellites

Hayashi, Kohei,   Ishiyama, Tomoaki,   Ogiya, Go,   Chiba, Masashi,   Inoue, Shigeki,   Mori, Masao
平成29年 7月   The Astrophysical Journal

NH$_3$ (1$_0$-0$_0$) in the pre-stellar core L1544

Caselli, P.,   Bizzocchi, L.,   Keto, E.,   Sipilä, O.,   Tafalla, M.,   Pagani, L.
平成29年 7月