研究成果・発表論文

N-body simulation for self-gravitating collisional systems with a new SIMD instruction set extension to the x86 architecture, Advanced Vector eXtensions

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Tanikawa, Ataru,   Yoshikawa, Kohji,   Okamoto, Takashi,   Nitadori, Keigo

We present a high-performance N-body code for self-gravitating collisional systems accelerated with the aid of a new SIMD instruction set extension of the x86 architecture: Advanced Vector eXtensions (AVX), an enhanced version of the Streaming SIMD E...

Stereo pairs in Astrophysics

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Vogt, Frédéric,   Wagner, Alexander Y.

Stereoscopic visualization is seldom used in Astrophysical publications and presentations compared to other scientific fields, e.g., Biochemistry, where it has been recognized as a valuable tool for decades. We put forth the view that stereo pairs ca...

New method for exploring super-Eddington active galactic nuclei by near-infrared observations

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Kawakatu, N.,   Ohsuga, K.

We propose a new method to explore the candidate super-Eddington active galactic nuclei (AGNs). We examine the properties of infrared (IR) emission from the inner edge of the dusty torus in AGNs, which are powered by super- or sub-Eddington accretion...

A high-frequency study of the Sunyaev-Zel'dovich effect morphology in galaxy clusters

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Prokhorov, D.~A.,   Colafrancesco, S.,   Akahori, T.,   Million, E.~T.,   Nagataki, S.,   Yoshikawa, K.

High-frequency, high-resolution imaging of the Sunyaev-Zel'dovich (SZ) effect is an important technique to study the complex structures of the atmospheres of merging galaxy clusters. Such observations are sensitive to the details of the electron spec...

Unveiling the 3D temperature structure of galaxy clusters by means of the thermal Sunyaev-Zel'dovich effect

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Prokhorov, D.~A.,   Dubois, Y.,   Nagataki, S.,   Akahori, T.,   Yoshikawa, K.

The Sunyaev-Zel'dovich (hereinafter SZ) effect is a promising tool to derive the gas temperature of galaxy clusters. Approximation of a spherically symmetric gas distribution is usually used to determine the temperature structure of galaxy clusters, ...

Can electron distribution functions be derived through the Sunyaev-Zel'dovich effect?

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Prokhorov, D.~A.,   Colafrancesco, S.,   Akahori, T.,   Yoshikawa, K.,   Nagataki, S.,   Seon, K. -I.

Aims: Measurements of the Sunyaev-Zel'dovich (hereafter SZ) effect distortion of the cosmic microwave background provide methods to derive the gas pressure and temperature of galaxy clusters. Here we study the ability of SZ effect observations to de...

Evolution of Non-thermal Shell Emission Associated with Active Galactic Nucleus Jets

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Ito, Hirotaka,   Kino, Motoki,   Kawakatu, Nozomu,   Yamada, Shoichi

We explore the evolution of emissions by accelerated electrons in shocked shells driven by jets in active galactic nuclei. Focusing on powerful sources which host luminous quasars, we evaluated the broadband emission spectra by properly taking into a...

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N-body simulation for self-gravitating collisional systems with a new SIMD instruction set extension to the x86 architecture, Advanced Vector eXtensions

Tanikawa, Ataru,   Yoshikawa, Kohji,   Okamoto, Takashi,   Nitadori, Keigo

We present a high-performance N-body code for self-gravitating collisional systems accelerated with the aid of a new SIMD instruction set extension of the x86 architecture: Advanced Vector eXtensions (AVX), an enhanced version of the Streaming SIMD E...

平成24年 2月   New Astronomy
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ARGOT: accelerated radiative transfer on grids using oct-tree

Okamoto, Takashi,   Yoshikawa, Kohji,   Umemura, Masayuki

We present two types of numerical prescriptions that accelerate the radiative transfer calculation around point sources within a three-dimensional Cartesian grid by using the oct-tree structure for the distribution of radiation sources. In one prescr...

平成24年 2月   Monthly Notices of the Royal Astronomical Society
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Stereo pairs in Astrophysics

Vogt, Frédéric,   Wagner, Alexander Y.

Stereoscopic visualization is seldom used in Astrophysical publications and presentations compared to other scientific fields, e.g., Biochemistry, where it has been recognized as a valuable tool for decades. We put forth the view that stereo pairs ca...

平成24年 1月   Applied Surface Science
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New method for exploring super-Eddington active galactic nuclei by near-infrared observations

Kawakatu, N.,   Ohsuga, K.

We propose a new method to explore the candidate super-Eddington active galactic nuclei (AGNs). We examine the properties of infrared (IR) emission from the inner edge of the dusty torus in AGNs, which are powered by super- or sub-Eddington accretion...

平成23年 11月   Monthly Notices of the Royal Astronomical Society
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A high-frequency study of the Sunyaev-Zel'dovich effect morphology in galaxy clusters

Prokhorov, D.~A.,   Colafrancesco, S.,   Akahori, T.,   Million, E.~T.,   Nagataki, S.,   Yoshikawa, K.

High-frequency, high-resolution imaging of the Sunyaev-Zel'dovich (SZ) effect is an important technique to study the complex structures of the atmospheres of merging galaxy clusters. Such observations are sensitive to the details of the electron spec...

平成23年 9月   Monthly Notices of the Royal Astronomical Society
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Unveiling the 3D temperature structure of galaxy clusters by means of the thermal Sunyaev-Zel'dovich effect

Prokhorov, D.~A.,   Dubois, Y.,   Nagataki, S.,   Akahori, T.,   Yoshikawa, K.

The Sunyaev-Zel'dovich (hereinafter SZ) effect is a promising tool to derive the gas temperature of galaxy clusters. Approximation of a spherically symmetric gas distribution is usually used to determine the temperature structure of galaxy clusters, ...

平成23年 8月   Monthly Notices of the Royal Astronomical Society
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Near-infrared Reverberation by Dusty Clumpy Tori in Active Galactic Nuclei

Kawaguchi, Toshihiro,   Mori, Masao

According to recent models, the accretion disk and black hole in active galactic nuclei (AGNs) are surrounded by a clumpy torus. We investigate the NIR flux variation of the torus in response to a UV flash for various geometries. Anisotropic illumina...

平成23年 8月   The Astrophysical Journal
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The Core-Cusp Problem in Cold Dark Matter Halos and Supernova Feedback: Effects of Mass Loss

Ogiya, Go,   Mori, Masao

The core-cusp problem remains as one of the unsolved discrepancies between observations and theories predicted by the standard paradigm of cold dark matter (CDM) cosmology. To solve this problem, we perform N-body simulations to study the nonlinear r...

平成23年 7月   The Astrophysical Journal Letters
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Can electron distribution functions be derived through the Sunyaev-Zel'dovich effect?

Prokhorov, D.~A.,   Colafrancesco, S.,   Akahori, T.,   Yoshikawa, K.,   Nagataki, S.,   Seon, K. -I.

Aims: Measurements of the Sunyaev-Zel'dovich (hereafter SZ) effect distortion of the cosmic microwave background provide methods to derive the gas pressure and temperature of galaxy clusters. Here we study the ability of SZ effect observations to de...

平成23年 5月  
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Evolution of Non-thermal Shell Emission Associated with Active Galactic Nucleus Jets

Ito, Hirotaka,   Kino, Motoki,   Kawakatu, Nozomu,   Yamada, Shoichi

We explore the evolution of emissions by accelerated electrons in shocked shells driven by jets in active galactic nuclei. Focusing on powerful sources which host luminous quasars, we evaluated the broadband emission spectra by properly taking into a...

平成23年 4月   The Astrophysical Journal

N-body simulation for self-gravitating collisional systems with a new SIMD instruction set extension to the x86 architecture, Advanced Vector eXtensions

Tanikawa, Ataru,   Yoshikawa, Kohji,   Okamoto, Takashi,   Nitadori, Keigo
平成24年 2月   New Astronomy

ARGOT: accelerated radiative transfer on grids using oct-tree

Okamoto, Takashi,   Yoshikawa, Kohji,   Umemura, Masayuki
平成24年 2月   Monthly Notices of the Royal Astronomical Society

Stereo pairs in Astrophysics

Vogt, Frédéric,   Wagner, Alexander Y.
平成24年 1月   Applied Surface Science

New method for exploring super-Eddington active galactic nuclei by near-infrared observations

Kawakatu, N.,   Ohsuga, K.
平成23年 11月   Monthly Notices of the Royal Astronomical Society

A high-frequency study of the Sunyaev-Zel'dovich effect morphology in galaxy clusters

Prokhorov, D.~A.,   Colafrancesco, S.,   Akahori, T.,   Million, E.~T.,   Nagataki, S.,   Yoshikawa, K.
平成23年 9月   Monthly Notices of the Royal Astronomical Society

Unveiling the 3D temperature structure of galaxy clusters by means of the thermal Sunyaev-Zel'dovich effect

Prokhorov, D.~A.,   Dubois, Y.,   Nagataki, S.,   Akahori, T.,   Yoshikawa, K.
平成23年 8月   Monthly Notices of the Royal Astronomical Society

Near-infrared Reverberation by Dusty Clumpy Tori in Active Galactic Nuclei

Kawaguchi, Toshihiro,   Mori, Masao
平成23年 8月   The Astrophysical Journal

The Core-Cusp Problem in Cold Dark Matter Halos and Supernova Feedback: Effects of Mass Loss

Ogiya, Go,   Mori, Masao
平成23年 7月   The Astrophysical Journal Letters

Can electron distribution functions be derived through the Sunyaev-Zel'dovich effect?

Prokhorov, D.~A.,   Colafrancesco, S.,   Akahori, T.,   Yoshikawa, K.,   Nagataki, S.,   Seon, K. -I.
平成23年 5月  

Evolution of Non-thermal Shell Emission Associated with Active Galactic Nucleus Jets

Ito, Hirotaka,   Kino, Motoki,   Kawakatu, Nozomu,   Yamada, Shoichi
平成23年 4月   The Astrophysical Journal