研究成果・発表論文

Infrared 3-4\ensuremathμm Spectroscopy of Nearby PG QSOs and AGN-Nuclear Starburst Connections in High-luminosity AGN Populations

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Imanishi, Masatoshi,   Ichikawa, Kohei,   Takeuchi, Tomoe,   Kawakatu, Nozomu,   Oi, Nagisa,   Imase, Keisuke

We present the results of infrared L-band (3-4\ensuremathμm) slit spectroscopy of 30 PG QSOs at z < 0.17, a representative sample of local high-luminosity, optically selected AGNs. The 3.3\ensuremathμm polycyclic aromatic hydrocarbon (PAH) emissio...

The Subaru Ly\ensuremathα blob survey: a sample of 100-kpc Ly\ensuremathα blobs at z = 3

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Matsuda, Y.,   Yamada, T.,   Hayashino, T.,   Yamauchi, R.,   Nakamura, Y.,   Morimoto, N.

We present results of a survey for giant Ly\ensuremathα blobs (LABs) at z = 3 with Subaru/Suprime-Cam. We obtained Ly\ensuremathα imaging at z = 3.09 \ensuremath± 0.03 around the SSA22 protocluster and in several blank fields. The total survey area i...

Long-term Spectral Variations of Ultraluminous X-ray Sources in the Interacting Galaxy Systems M 51 and NGC 4490/85

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Yoshida, Tessei,   Ebisawa, Ken,   Matsushita, Kyoko,   Tsujimoto, Masahiro,   Kawaguchi, Toshihiro

Variable ultraluminous X-ray sources (ULXs), which are considered to be black hole binaries (BHBs), are known to show state transitions similar to Galactic BHBs. However, the relation between the ULX states and the Galactic BHB states is still unclea...

Two types of Lyman \ensuremathα emitters envisaged from hierarchical galaxy formation

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Shimizu, Ikkoh,   Umemura, Masayuki

In the last decade, numerous Lyman \ensuremathα (Ly\ensuremathα) emitters (LAEs) have been discovered with narrow-band filters at various redshifts. Recently, multiwavelength observations of LAEs have been performed and revealed that while many LAEs ...

Hydrodynamic Simulations of Merging Galaxy Clusters: Non-Equilibrium Ionization State and Two-Temperature Structure

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Akahori, Takuya,   Yoshikawa, Kohji

We investigate a non-equilibrium ionization state and an electron-ion two-temperature structure of the intracluster medium (ICM) in merging galaxy clusters using a series of N-body and hydrodynamic simulations. Mergers with various sets of mass ratio...

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Infrared 3-4\ensuremathμm Spectroscopy of Nearby PG QSOs and AGN-Nuclear Starburst Connections in High-luminosity AGN Populations

Imanishi, Masatoshi,   Ichikawa, Kohei,   Takeuchi, Tomoe,   Kawakatu, Nozomu,   Oi, Nagisa,   Imase, Keisuke

We present the results of infrared L-band (3-4\ensuremathμm) slit spectroscopy of 30 PG QSOs at z < 0.17, a representative sample of local high-luminosity, optically selected AGNs. The 3.3\ensuremathμm polycyclic aromatic hydrocarbon (PAH) emissio...

平成23年 3月   Publications of the Astronomical Society of Japan
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Successive Merger of Multiple Massive Black Holes in a Primordial Galaxy

Tanikawa, A.,   Umemura, M.

Using highly accurate N-body simulations, we explore the evolution of multiple massive black holes (hereafter MBHs) in a primordial galaxy that is composed of stars and MBHs. The evolution is pursed with a fourth-order Hermite scheme, where not only ...

平成23年 2月   The Astrophysical Journal Letters
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The Subaru Ly\ensuremathα blob survey: a sample of 100-kpc Ly\ensuremathα blobs at z = 3

Matsuda, Y.,   Yamada, T.,   Hayashino, T.,   Yamauchi, R.,   Nakamura, Y.,   Morimoto, N.

We present results of a survey for giant Ly\ensuremathα blobs (LABs) at z = 3 with Subaru/Suprime-Cam. We obtained Ly\ensuremathα imaging at z = 3.09 \ensuremath± 0.03 around the SSA22 protocluster and in several blank fields. The total survey area i...

平成23年 1月   Monthly Notices of the Royal Astronomical Society
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Orientation Effects on the Inner Region of Dusty Torus of Active Galactic Nuclei

Kawaguchi, Toshihiro,   Mori, Masao

A sublimation process governs the innermost region of the dusty torus of active galactic nuclei. However, the observed inner radius of the torus is systematically smaller than the expected radius by a factor of åisebox-0.5ex~1/3. We show that the ani...

平成22年 12月   The Astrophysical Journal Letters
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Long-term Spectral Variations of Ultraluminous X-ray Sources in the Interacting Galaxy Systems M 51 and NGC 4490/85

Yoshida, Tessei,   Ebisawa, Ken,   Matsushita, Kyoko,   Tsujimoto, Masahiro,   Kawaguchi, Toshihiro

Variable ultraluminous X-ray sources (ULXs), which are considered to be black hole binaries (BHBs), are known to show state transitions similar to Galactic BHBs. However, the relation between the ULX states and the Galactic BHB states is still unclea...

平成22年 10月   The Astrophysical Journal
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START: smoothed particle hydrodynamics with tree-based accelerated radiative transfer

Hasegawa, K.,   Umemura, M.

We present a novel radiation hydrodynamics code, START, which is a smoothed particle hydrodynamics (SPH) scheme coupled with accelerated radiative transfer. The basic idea for the acceleration of radiative transfer is parallel to the tree algorithm t...

平成22年 10月   Monthly Notices of the Royal Astronomical Society
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Two types of Lyman \ensuremathα emitters envisaged from hierarchical galaxy formation

Shimizu, Ikkoh,   Umemura, Masayuki

In the last decade, numerous Lyman \ensuremathα (Ly\ensuremathα) emitters (LAEs) have been discovered with narrow-band filters at various redshifts. Recently, multiwavelength observations of LAEs have been performed and revealed that while many LAEs ...

平成22年 8月   Monthly Notices of the Royal Astronomical Society
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Hydrodynamic Simulations of Merging Galaxy Clusters: Non-Equilibrium Ionization State and Two-Temperature Structure

Akahori, Takuya,   Yoshikawa, Kohji

We investigate a non-equilibrium ionization state and an electron-ion two-temperature structure of the intracluster medium (ICM) in merging galaxy clusters using a series of N-body and hydrodynamic simulations. Mergers with various sets of mass ratio...

平成22年 4月   Publications of the Astronomical Society of Japan

Infrared 3-4\ensuremathμm Spectroscopy of Nearby PG QSOs and AGN-Nuclear Starburst Connections in High-luminosity AGN Populations

Imanishi, Masatoshi,   Ichikawa, Kohei,   Takeuchi, Tomoe,   Kawakatu, Nozomu,   Oi, Nagisa,   Imase, Keisuke
平成23年 3月   Publications of the Astronomical Society of Japan

Successive Merger of Multiple Massive Black Holes in a Primordial Galaxy

Tanikawa, A.,   Umemura, M.
平成23年 2月   The Astrophysical Journal Letters

The Subaru Ly\ensuremathα blob survey: a sample of 100-kpc Ly\ensuremathα blobs at z = 3

Matsuda, Y.,   Yamada, T.,   Hayashino, T.,   Yamauchi, R.,   Nakamura, Y.,   Morimoto, N.
平成23年 1月   Monthly Notices of the Royal Astronomical Society

Orientation Effects on the Inner Region of Dusty Torus of Active Galactic Nuclei

Kawaguchi, Toshihiro,   Mori, Masao
平成22年 12月   The Astrophysical Journal Letters

Long-term Spectral Variations of Ultraluminous X-ray Sources in the Interacting Galaxy Systems M 51 and NGC 4490/85

Yoshida, Tessei,   Ebisawa, Ken,   Matsushita, Kyoko,   Tsujimoto, Masahiro,   Kawaguchi, Toshihiro
平成22年 10月   The Astrophysical Journal

START: smoothed particle hydrodynamics with tree-based accelerated radiative transfer

Hasegawa, K.,   Umemura, M.
平成22年 10月   Monthly Notices of the Royal Astronomical Society

Two types of Lyman \ensuremathα emitters envisaged from hierarchical galaxy formation

Shimizu, Ikkoh,   Umemura, Masayuki
平成22年 8月   Monthly Notices of the Royal Astronomical Society

Hydrodynamic Simulations of Merging Galaxy Clusters: Non-Equilibrium Ionization State and Two-Temperature Structure

Akahori, Takuya,   Yoshikawa, Kohji
平成22年 4月   Publications of the Astronomical Society of Japan