研究成果・発表論文

Modeling Nonlinear Evolution of Baryon Acoustic Oscillations: Convergence Regime of N-body Simulations and Analytic Models

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Nishimichi, Takahiro,   Shirata, Akihito,   Taruya, Atsushi,   Yahata, Kazuhiro,   Saito, Shun,   Suto, Yasushi

We used a series of cosmological N-body simulations and various analytic models to study the evolution of the matter power spectrum in real space in a \ensuremathŁambda cold dark matter universe. We compared the results of N-body simulations against ...

Kinematic and Chemical Constraints on the Formation of M31's Inner and Outer Halo

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Koch, Andreas,   Rich, R. Michael,   Reitzel, David B.,   Martin, Nicolas F.,   Ibata, Rodrigo A.,   Chapman, Scott C.

The halo of M31 shows a wealth of substructures, some of which are consistent with assembly from satellite accretion. Here we report on kinematic and abundance results from Keck DEIMOS spectroscopy in the near-infrared calcium triplet region of over ...

Suzaku broad-band spectroscopy of RX J1347.5-1145: constraints on the extremely hot gas and non-thermal emission

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Ota, N.,   Murase, K.,   Kitayama, T.,   Komatsu, E.,   Hattori, M.,   Matsuo, H.

Context: We present the results of our analysis of long Suzaku observations (149 ks and 122 ks for XIS and HXD, respectively) of the most X-ray luminous galaxy cluster, RX J1347.5-1145, at z=0.451. Aims: To understand the gas physics of a violent, cl...

Non-Equilibrium Ionization State and Two-Temperature Structure in the Linked Region of Abell 399 and Abell 401

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Akahori, Takuya,   Yoshikawa, Kohji

We investigate a non-equilibrium ionization state and a two-temperature structure of the intracluster medium in the linked region of Abell 399 and Abell 401, using a series of N-body + Smoothed Particle Hydrodynamics (SPH) simulations, and find that ...

Nuclear/Circumnuclear Starbursts and Active Galactic Nucleus Mass Accretion in Seyfert Galaxies

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Watabe, Yasuyuki,   Kawakatu, Nozomu,   Imanishi, Masatoshi

We investigated the correlation between nuclear/circumnuclear starbursts around active galactic nuclei (AGNs) and the AGN activities for 43 Seyfert galaxies in the CfA and 12 \ensuremathμm samples. We found that the circumnuclear starburst luminosity...

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Modeling Nonlinear Evolution of Baryon Acoustic Oscillations: Convergence Regime of N-body Simulations and Analytic Models

Nishimichi, Takahiro,   Shirata, Akihito,   Taruya, Atsushi,   Yahata, Kazuhiro,   Saito, Shun,   Suto, Yasushi

We used a series of cosmological N-body simulations and various analytic models to study the evolution of the matter power spectrum in real space in a \ensuremathŁambda cold dark matter universe. We compared the results of N-body simulations against ...

平成21年 2月   Publications of the Astronomical Society of Japan
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Kinematic and Chemical Constraints on the Formation of M31's Inner and Outer Halo

Koch, Andreas,   Rich, R. Michael,   Reitzel, David B.,   Martin, Nicolas F.,   Ibata, Rodrigo A.,   Chapman, Scott C.

The halo of M31 shows a wealth of substructures, some of which are consistent with assembly from satellite accretion. Here we report on kinematic and abundance results from Keck DEIMOS spectroscopy in the near-infrared calcium triplet region of over ...

平成20年 12月   The Astrophysical Journal
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Suzaku broad-band spectroscopy of RX J1347.5-1145: constraints on the extremely hot gas and non-thermal emission

Ota, N.,   Murase, K.,   Kitayama, T.,   Komatsu, E.,   Hattori, M.,   Matsuo, H.

Context: We present the results of our analysis of long Suzaku observations (149 ks and 122 ks for XIS and HXD, respectively) of the most X-ray luminous galaxy cluster, RX J1347.5-1145, at z=0.451. Aims: To understand the gas physics of a violent, cl...

平成20年 11月  
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Non-Equilibrium Ionization State and Two-Temperature Structure in the Linked Region of Abell 399 and Abell 401

Akahori, Takuya,   Yoshikawa, Kohji

We investigate a non-equilibrium ionization state and a two-temperature structure of the intracluster medium in the linked region of Abell 399 and Abell 401, using a series of N-body + Smoothed Particle Hydrodynamics (SPH) simulations, and find that ...

平成20年 8月   Publications of the Astronomical Society of Japan
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The impact of a supernova explosion in a very massive binary

Sato, Jun'ichi,   Umemura, Masayuki,   Sawada, Keisuke

We consider the effect of a supernova (SN) explosion in a very massive binary that is expected to form in a portion of Population III stars with the mass higher than 100M$_solar$. In a Population III binary system, a more massive star can result in t...

平成20年 7月   Monthly Notices of the Royal Astronomical Society
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Nuclear/Circumnuclear Starbursts and Active Galactic Nucleus Mass Accretion in Seyfert Galaxies

Watabe, Yasuyuki,   Kawakatu, Nozomu,   Imanishi, Masatoshi

We investigated the correlation between nuclear/circumnuclear starbursts around active galactic nuclei (AGNs) and the AGN activities for 43 Seyfert galaxies in the CfA and 12 \ensuremathμm samples. We found that the circumnuclear starburst luminosity...

平成20年 4月   The Astrophysical Journal