Nishi Ryoichi NISHI Ryoichi

ID:1000080252419

Department of Physics, Niigata University (2005年 CiNii収録論文より)

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Articles:  1-14 of 14

  • Primordial Molecular Emission in Population III Galaxies

    MIZUSAWA Hiromi , OMUKAI Kazuyuki , NISHI Ryoichi

    Publications of the Astronomical Society of Japan 57(6), 951-967, 2005-12-25

    References (58) Cited by (1)

  • H_2 Line Emission Associated with the Formation of the First Stars

    MIZUSAWA Hiromi , NISHI Ryoichi , OMUKAI Kazuyuki

    PASJ : publications of the Astronomical Society of Japan 56(3), 487-495, 2004-06-25

    References (26)

  • H2 Line Emission Associated with the Formation of the First Stars

    Mizusawa Hiromi , Nishi Ryoichi

    Publications of the Astronomical Society of Japan 56(3), 487-495, 2004

  • Chapter 1 Star Formation in the Primordial Gas : Overview

    NISHI Ryoichi

    Progress of Theoretical Physics (147), 1-9, 2003-02-28

    References (33)

  • Kepler Rotation Effects on the Binary-Lens Microlensing Events

    IOKA Kunihito , NISHI Ryoichi , KAN-YA Yukitoshi , Department of Physics Kyoto University , Department of Physics Kyoto University , National Astronomical Observatory

    We investigate the effects of the Kepler rotation of lens binaries on the binarymicrolensing events towards the Large Magellanic Cloud(LMC)and the Small Magellanic Cloud(SMC). It is found that the rot …

    Progress of Theoretical Physics 102(5), 983-1000, 1999-11-25

    DOI  References (59)

  • Dark Matter Search with Gravitational Microlensing Events

    NISHI Ryoichi , IOKA Kunihito , KAN-YA Yukitoshi

    The observations of gravitational microlensing events in the direction of the LMC have suggested that a significant fraction of the Milky Way's halo consists of MACHOs. At present, however, we do not …

    Progress of Theoretical Physics 133, 211-231, 1999-05-31

    DOI  NDL Digital Collections  References (98) Cited by (2)

  • Back Reaction to the Spectrum of Magnetic Field in the Kinetic Dynamo Theory : Modified Kulsrud-Anderson Equation

    SHIROMIZU Tetsuya , NISHI Ryoichi , DAMTP University of Cambridge:Department of Physics The University of Tokyo:Research Center for the Early Universe (RESCEU) The University of Tokyo , Department of Physics Kyoto Urhiversity

    We take account of the lowest order back reaction on a fluid and modify the Kulsrud-Anderson equation, ∂ <sub><em>t</em></sub> {\cal E}<sub><em>M</em>< …

    Progress of Theoretical Physics 101(1), 39-45, 1999-01-25

    J-STAGE  References (14)

  • Thermal and Dynamical Evolution of Primordial Gas Clouds : On the Formation of First Luminous Objects

    NISHI Ryoichi , SUSA Hajime , UEHARA Hideya , YAMADA Masako , OMUKAI Kazuyuki , Department of Physics Kyoto University , Center for Computational Physics University of Tsukuba , Division of Theoretical Astrophysics National Astronomical Observatory , Department of Physics Kyoto University , Department of Physics Kyoto University

    We investigate the thermal and dynamical evolution of primordial gas clouds in the universe after decoupling. Comparing the time scale of dynamical evolution with that of fragmentation, we can estimat …

    Progress of Theoretical Physics 100(5), 881-903, 1998-11-25

    J-STAGE  References (28)

  • The Thermal Evolution of the Postshock Layer in Pregalactic Clouds

    SUSA Hajime , UEHARA Hideya , NISHI Ryoichi , YAMADA Masako , Center for Computational Physics University of Tsukuba , Department of Physics Kyoto University , Department of Physics Kyoto University , Department of Physics Kyoto University

    We re-examine the thermal evolution of the postshock layer in primordial gas clouds. Comparing the time scales, we find that the evolutionary paths of postshock regions in primordial gas clouds can be …

    Progress of Theoretical Physics 100(1), 63-77, 1998-07-25

    DOI  References (30)

  • Expected EAGLE Event Rate towards the Magellanic Clouds

    NAKAMURA Takashi , NISHI Ryoichi , Yukawa Institute for Theoretical Physics Kyoto University , Department of Physics Kyoto University

    We propose to search for MACHOs by observing EAGLE (Extremely Amplified Gravitational LEnsing) events of a majority of dim stars. This search is independent of the usual one. For the detection limit o …

    Progress of Theoretical Physics 99(6), 963-970, 1998-06-25

    J-STAGE  References (29)

  • Evolution of Primordial Protostellar Clouds : Quasi-Static Analysis

    OMUKAI Kazuyuki , NISHI Ryoichi , UEHARA Hideya , SUSA Hajime , Department of Physics Kyoto University , Department of Physics Kyoto University , Department of Physics Kyoto University , Center for Computational Physics University of Tsukuba

    The contraction processes of metal-free molecular clouds of starlike mass (or cloud cores) are investigated. We calculate radiative transfer of the H_2 lines and examine quasi-static contraction with …

    Progress of Theoretical Physics 99(5), 747-761, 1998-05-25

    DOI  References (32) Cited by (2)

  • The Fragment Mass Scale of the Primordial Gas Clouds. I : Non-Spherical Pressure-Free Collapse

    SUSA Hajime , UEHARA Hideya , NISHI Ryoichi , Department of Physics Kyoto University , Department of Physics Kyoto University , Department of Physics Kyoto University

    We investigate the thermal evolution of non-spherical primordial gas clouds of mass M=10^6M_⊙. We study two cases prolate and oblate clouds without angular momentum,initially spherical,oblate and …

    Progress of Theoretical Physics 96(6), 1073-1086, 1996-12-25

    J-STAGE  References (21)

  • On the Instability of Decelerating Shock Waves

    Ryoichi NISHI , Department of Physics Kyoto University

    We examine the decelerating shock instability (DSI) with a linear perturbation theory. We also investigate the effect of the self-gravity on the instability of a decelerating shocked layer. We find th …

    Progress of Theoretical Physics 87(2), p347-365, 1992-02

    DOI 

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