ブラックホール形成シナリオにもとづくガンマ線バーストの起源

• Project/Area Number: 14079202
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: 佐藤 勝彦 The University of Tokyo, 大学院・理学系研究科, 教授 (00111914)
• Co-Investigator(Kenkyū-buntansha): 山田 章一 早稲田大学, 理工学術院, 教授 (80251403) ; 戸谷 友則 京都大学, 大学院・理学研究科, 准教授 (90321588) ; 長滝 重博 京都大学, 基礎物理学研究所, 助教授 (60359643)
• Project Period (FY): 2002 – 2006
• Project Status: Completed (Fiscal Year 2006)
• Budget Amount: ¥21,200,000 (Direct Cost: ¥21,200,000); Fiscal Year 2006: ¥3,100,000 (Direct Cost: ¥3,100,000); Fiscal Year 2005: ¥3,200,000 (Direct Cost: ¥3,200,000); Fiscal Year 2004: ¥5,500,000 (Direct Cost: ¥5,500,000); Fiscal Year 2003: ¥3,700,000 (Direct Cost: ¥3,700,000); Fiscal Year 2002: ¥5,700,000 (Direct Cost: ¥5,700,000)
• Keywords: ブラックホール / ガンマ線バースト / 超新星爆発 / ニュートリノ / 超高エネルギー宇宙線 / 磁場 / 重元素合成 / ジェット / 第一世代星 / 中性子星 / スーパーカミオカンデ / AGASA

Research Abstract

今年度の成果は以下のとおりである。
第一は、自転していない大質量星の重力崩壊におけるブラックホール形成とそこから放出されるニュートリノシグナルに関するものである。ガンマ線バーストのセントラルエンジンとしては高速回転しているブラックホールが有望視されているが、自転の遅い親星のほうが圧倒的に多い可能性がある。こうした天体現象はまだ観測されていないが、それは電磁波を放出していないだけからかもしれず、ニュートリノでは明るく輝く可能性がある。本研究では、親星の質量をパラメターにし、詳細なニュートリノ輸送を考慮した一般相対論的流体力学シミュレーションを系統的に行い、こうした現象に特有なニュートリノシグナルを明らかにした。これを用いれば、ブラックホールが形成されたことだけでなく、高密度ハドロン物質の状態方程式に関しても重要な情報を得られる可能性を示した。
第二の成果は、コラプサーシナリオに基づく多次元MHDシミュレーションによるジェットの形成と元素合成に関するものである。この研究では、ジェットがブラックホールのごく近傍ではなく、離れた所でも形成されうる可能性を示した点で独創的であった。また、爆発的元素合成を詳細に計算し、その特徴を明らかにした。
第二の成果は、近年着目されている超新星コア内の降着衝撃波の不安定に関するものである。我々は、線形解析と数値シミュレーションを組み合わせ、不安定性の線形段階から非線形段階に至る成長の様子を明らかにした。また、重力波放出も見積もるとともに、Burrowsの提唱する音波により超新星爆発を誘起するメカニズムとの関連も議論した。
第4の成果は超新星コア内における原子核の形状である。密度の上昇にともない原子核は互いに合体し、糸状、板状、また高密度領域に囲まれた糸状、球状の低密度領域などに相転移(パスタ構造)をとるが、新たな原子核モデルで、密度-温度面での相図を作成した。ニュートリノの透過率に対して重要なデータとなる。
第5の成果は、最高赤方偏移ガンマ線バーストGRB050904を用いて、宇宙の再電離に対する示唆を世界で初めてガンマ線バーストから導くことに成功したことである。また、活動銀河中心核からのガンマ線について理論的研究を行い、MeV領域からGeV領域にかけての宇宙背景放射への寄与を精密にみつもった。特に、今まで説明が難しいと言われていたMeV領域の背景放射が、X線領域で卓越しているセイファート銀河成分の自然な理論的拡張で説明できることを示した。さらに、長年の謎である銀河系中心からの511keV電子陽電子対消滅ガンマ線が、銀河系中心の超巨大ブラックホールの過去の活動性で自然に説明できることを示した。

Research Products

• [Journal Article] The Cosmic MeV Gamma-Ray Background and Hard X-Ray Spectra of Active Galactic Nuclei: Implications for the Origin of Hot AGN Coronae (2008)
  • Author(s): Y. Inoue, T. Totani, and Y. Ueda
  • Journal Title: Astrophysical Journal 672
• [Journal Article] Gravitational Radiation from Standing Accretion Shock Instability in Core-Collapse Supernovae (2007)
  • Author(s): Kei Kotake, Naofumi Ohnishi, and Shoichi Yamada
  • Journal Title: Astrophysical Journal 655
• [Journal Article] Stability of the Accretion Flows with Stalled Shocks in Core-Collapse Supernovae (2007)
  • Author(s): Tatsuya Yamasaki and Shoichi Yamada
  • Journal Title: Astrophysical Journal 656 Pages: 1019-1037
• [Journal Article] Heavy Element Nucleosynthesis in a Collapsar (2007)
  • Author(s): Shin-ichirou Fujimoto, Masa-aki Hashimoto, Kei Kotake, and Shoichi Yamada
  • Journal Title: Astrophysical Journal 656 Pages: 382-392
• [Journal Article] The g-Mode Excitation in the Proto Neutron Star by the Standing Accretion Shock Instability (2007)
  • Author(s): Shijun Yoshida, Naofumi Ohnishi, and Shoichi Yamada
  • Journal Title: Astrophysical Journal 665 Pages: 1268-1276
• [Journal Article] Numerical Study on Stellar Core Collapse and Neutrino Emission: Probe into the Spherically Symmetric Black Hole Progenitors with 3- 30M \odot Iron Cores (2007)
  • Author(s): Ken'ichiro Nakazato, Kohsuke Sumiyoshi, and Shoichi Yamada
  • Journal Title: Astrophysical Journal 666 Pages: 1140-1151
• [Journal Article] Inelastic Neutrino-Helium Scatterings and Standing Accretion Shock Instability in Core-Collapse Supernovae (2007)
  • Author(s): Naofumi Ohnishi, Kei Kotake, and Shoichi Yamada Tatsuya Yamasaki and Shoichi Yamada
  • Journal Title: Astrophysical Journal 667 Pages: 382-394
• [Journal Article] Reply to ''Comment on 'Heavy element production in inhomogeneous bigbang nucleosynthesis''' (2007)
  • Author(s): Shunji. Matsuura, Shin-ichirou. Fujimoto, Sumao Nishimura, Masa-aki Hashimoto, Katsuhiko Sato
  • Journal Title: Phys RevD. 75 Pages: 68302-68302
• [Journal Article] The impact of nuclear ″pasta″ on neutrino transport in collapsing cores (2007)
  • Author(s): Hidetaka Sonoda, Gentaro Watanabe, Katsuhiko Sato, Tomoya Takiwaki, Kenji Yasuoka, Toshikazu Ebisuzaki
  • Journal Title: Phys Rev. C 75 Pages: 42801-42801
• [Journal Article] Magnetohydrodynamic Simulations of A Rotating Massive Star Collapsing to A Black Hole (2006)
  • Author(s): Shin-ichirou Fujimoto, Kei Kotake, Shoichi Yamada, Masa-aki Hashimoto, and Katsuhiko Sato
  • Journal Title: Astrophys. J. 644 Pages: 1040-1055
• [Journal Article] R-Process Nucleosynthesis in MHD Jet Explosions of Core-Collapse Supernovae (2006)
  • Author(s): Sunao Nishimura, et. al.
  • Journal Title: Astrophysical Journal 642 Pages: 410-419
• [Journal Article] Magnetohydrodynamic Simulations of a Rotating Massive Star Collapsing to a Black Hole (2006)
  • Author(s): Shin-ichirou Fujimoto, et. al.
  • Journal Title: Astrophysical Journal 644 Pages: 1040-1055
• [Journal Article] Gravitational Collapse and Neutrino Emission of Population III Massive Stars (2006)
  • Author(s): Ken'ichiro Nakazato, Kohsuke Sumiyoshi and Shoichi Yamada
  • Journal Title: Astrophysical Journal 645 Pages: 519-533
• [Journal Article] Neutrino signals from the formation of a black hole: A probe of the equation of state of dense matter (2006)
  • Author(s): K. Sumiyoshi, S. Yamada, H. Suzuki, and S. Chiba
  • Journal Title: Physical Review Letters 97 Pages: 91101-91101
• [Journal Article] Standing Accretion Shocks in the Supernova Core: Effects of Convection and Realistic EOS (2006)
  • Author(s): Tatsuya Yamasaki and Shoichi Yamada
  • Journal Title: Astrophysical Journal 650 Pages: 291-298
• [Journal Article] Propagation of Ultra-High Energy Cosmic Rays above $10^{19} $ eV in a Structured Extragalactic Magnetic Field and Galactic Magnetic Field (2006)
  • Author(s): Hajime Takami, Hiroyuki Yoshiguchi, Katsuhiko Sato
  • Journal Title: Astrophys. J. 639 Pages: 803-815
• [Journal Article] Explosive Nucleosynthesis in GRB Jets Accompanied by Hypernovae (2006)
  • Author(s): Shigehiro Nagataki, Akira Mizuta, and Katsuhiko Sato
  • Journal Title: Astrophys. J. 647 Pages: 1255-1268
• [Journal Article] Explosion Mechanism, Neutrino Burst, and Gravitational Wave in Core-Collapse Supernovae (2006)
  • Author(s): Kei Kotake, Katsuhiko Sato, Keitaro Takahashi
  • Journal Title: Reports on Progress in Physics 69 Pages: 971-1144
• [Journal Article] Gamma-Ray Luminosity Function of Blazars and the Cosmic Gamma-Ray Background: Evidence for the Luminosity-Dependent Density Evolution (2006)
  • Author(s): Takuto Narumoto and Tomonori Totani
  • Journal Title: The Astrophysical Journal 643 Pages: 81-81
• [Journal Article] A RIAF Interpretation for the Past Higher Activity of the Galactic Center Black Hole and the 511 keV Annihilation Emission (2006)
  • Author(s): Tomonori Totani
  • Journal Title: Pub. Astron. Soc. Jpn 58 Pages: 965-965
  • NAID: 10023943299
• [Journal Article] Implications for Cosmic Reionization from the Optical Afterglow Spectrum of the Gamma-Ray Burst 050904 at z = 6.3 (2006)
  • Author(s): T. Totani, et. al.
  • Journal Title: Pub. Astron. Soc. Jpn 58 Pages: 485-485
  • NAID: 10023941176
• [Journal Article] High Energy Neutrino Radiation and Neutrino Background from Gamma-Ray Bursts in the Internal Shock Model (2006)
  • Author(s): Murase, K., Nagataki, S.
  • Journal Title: Physical Review D 73 Pages: 63002-63002
• [Journal Article] Very High Energy Neutrinos Originating from Kaons in Gamma-Ray Bursts (2006)
  • Author(s): Asano, K., Nagataki, S.
  • Journal Title: The Astrophysical Journal Letters (accepted)
• [Journal Article] Numerical Analysis on Standing Accretion Shock Instability with Neutrino Heating in the Supernova Cores (2006)
  • Author(s): Ohnishi, N., Kotake, K., Yamada, S.
  • Journal Title: The Astrophysical Journal in press
• [Journal Article] R-Process Nucleosynthesis in MHD Jet Explosions of Core-Collapse Supernovae (2006)
  • Author(s): Nishimura, S.et al.
  • Journal Title: The Astrophysical Journal in press
• [Journal Article] Magnetohydrodynamic Simulations of a Rotating Massive Star Collapsing to a Black Hole (2006)
  • Author(s): Fujimoto, S., Kotake, K., Yamada, S., Hashimoto, M., Sato, K.
  • Journal Title: The Astrophysical Journal in press
• [Journal Article] Explosion Mechanism, Neutrino Burst, and Gravitational Wave in Core-Collapse Supernovae (2006)
  • Author(s): Kotake, K., Sato, K., Takahashi., K
  • Journal Title: Reports on Progress in Physics in press
• [Journal Article] Alfven Wave-driven Proto-Neutron Star Winds And r-Process Nucleosynthesis (2005)
  • Author(s): Suzuki, T.K., Nagataki, S.
  • Journal Title: The Astrophysical Journal 628 Pages: 914-922
• [Journal Article] Effects of Magnetic Fields on Proto-Neutron Star Winds and r-Process Nucleosynthesis (2005)
  • Author(s): Ito, H., Yamada, S., Sumiyoshi, K., Nagataki, S.
  • Journal Title: Progress of Theoretical Physics 114 Pages: 995-1020
• [Journal Article] Postbounce Evolution of Core-Collapse Supernovae : Long-Term Effects of Equation of State (2005)
  • Author(s): Sumiyoshi, K., Yamada, S., Suzuki, H., Shen, H.
  • Journal Title: The Astrophysical Journal 629 Pages: 922-932
• [Journal Article] The Core-Collapse Supernova with "Non-Uniform" Magnetic Fields (2005)
  • Author(s): Sawai, H., Kotake, K., Yamada, S.
  • Journal Title: The Astrophysical Journal 631 Pages: 446-455
• [Journal Article] North-South Neutrino Heating Asymmetry in Strongly Magnetized and Rotating Stellar Cores (2005)
  • Author(s): Kotake, K.et al.
  • Journal Title: Astrophysical Journal 618 Pages: 474-484
• [Journal Article] Simulation of Transitions between "Pasta" Phases in Dense Matter (2005)
  • Author(s): Watanabe, G.et al.
  • Journal Title: Physical Review Letters 94 Pages: 31101-31101
• [Journal Article] Effects of rotation on the revival of a stalled shock in supernova explosions (2005)
  • Author(s): Yamasaki, T.et al.
  • Journal Title: Astrophysical Journal (印刷中)
• [Journal Article] A Discovery of Rapid Optical Flares from Low-Luminosity Active Nuclei in Massive Galaxies (2005)
  • Author(s): Totani, T.
  • Journal Title: Astrophysical Journal Letters 621
• [Journal Article] Magnetorotational Effects on Anisotropic Neutrino Emission and Convection in Core-Collapse Supernovae (2004)
  • Author(s): Kotake, K.et al.
  • Journal Title: Astrophysical Journal 608 Pages: 391-404
• [Journal Article] Gravitational radiation from rotational core collapse : Effects of magnetic fields and realistic equations of state (2004)
  • Author(s): Kotake, K.et al.
  • Journal Title: Physical Review D 69 Pages: 124004-124004
• [Journal Article] Phases of hot nuclear matter at subnuclear densities (2004)
  • Author(s): Watanabe, G.et al.
  • Journal Title: Physical Review C 69 Pages: 55805-55805
• [Journal Article] Relic neutrino background from cosmological supernovae (2004)
  • Author(s): Ando, S., Sato, K.
  • Journal Title: New Journal of Physics 6 Pages: 170-170
• [Journal Article] Affleck-Dine Baryogenesis and Heavy Element Production from Inhomoaeneous Big Bang Nucleosynthesis (2004)
  • Author(s): Matsuura, S.et al.
  • Journal Title: Progress of Theoretical Physics 112 Pages: 971-981
• [Journal Article] Magneto-driven Shock Waves in Core-Collapse Supernovae (2004)
  • Author(s): Takiwaki, T.et al.
  • Journal Title: Astrophysical Journal 616 Pages: 1086-1094
• [Journal Article] Statistical Significance of Small-Scale Anisotropy in Arrival Directions of Ultra-High-Energy Cosmic Rays (2004)
  • Author(s): Yoshiguchi, H.et al.
  • Journal Title: Astrophysical Journal 614 Pages: 43-50
• [Journal Article] Numerical Study on the Propagation of Ultra-High-Energy Cosmic Rays in the Galactic Magnetic Field (2004)
  • Author(s): Yoshiguchi, H.et al.
  • Journal Title: Astrophysical Journal 607 Pages: 840-884
• [Journal Article] General Relativistic Magnetohydrodynamic Simulations of Collapsars (2004)
  • Author(s): Mizuno, Y.et al.
  • Journal Title: Astrophysical Journal 606 Pages: 395-412
• [Journal Article] The Role of Neutrinos, Rotations and Magnetic Fields in Collapse-Driven Supernovae (2004)
  • Author(s): Yamada, S.et al.
  • Journal Title: New Journal of Physics 6 Pages: 1-24
• [Journal Article] Propagation and Dynamics of Relativistic Jets (2004)
  • Author(s): Mizuta, A.et al.
  • Journal Title: Astrophysical Journal 606 Pages: 804-818
• [Journal Article] Numerical Study on the Rotational Collapse of Strongly Magnetized Cores of Massive Stars (2004)
  • Author(s): Yamada, S.et al.
  • Journal Title: Astrophysical Journal 608 Pages: 907-924
• [Journal Article] Anisotropic kinetic pressure in ideal MHD and application to entroov production in neutrino-driven wind in supernovae (2004)
  • Author(s): Kohri, K.et al.
  • Journal Title: Astrophysical Journal 21 Pages: 433-441
• [Journal Article] Hydrodynamic Effects in Internal Shock of Relativistic Outflows (2004)
  • Author(s): Kino, M.et al.
  • Journal Title: Astrophysical Journal 611 Pages: 1021-1032
• [Journal Article] General Relativistic Magnetohydrodynamic Simulations of Collapsars : Rotating Black Hole Cases (2004)
  • Author(s): Mizuno, Y.et al.
  • Journal Title: Astrophysical Journal 615 Pages: 389-401
• [Journal Article] Solving the Cooling Flow Problem of Galaxy Clusters by Dark Matter Neutralino Annihilation (2004)
  • Author(s): Totani, T.
  • Journal Title: Physical Review Letters 92 Pages: 1301-1304
• [Journal Article] Submillimetre constraints on hyper-extremely red objects in the Subaru Deep Field (2004)
  • Author(s): Coppin, K.et al.
  • Journal Title: Monthly Notice of Royal Astronomical Society 354 Pages: 193-198
• [Publications] K.Takahashi et al.: "Effects of neutrino oscillation on supernova neutrino : inverted mass hierarchy"Prog.Theor.Phys.. 109. 919 (2003)
• [Publications] S.Ando et al.: "Detectability of the Supernova Relic Neutrinos and Neutrino Oscillation"Astropart.Phys.. 18. 307-318 (2003)
• [Publications] S.Ando et al.: "Three-generation study of neutrino spin-flavor conversion in supernova and implication for neutrino magnetic moment"Phys.Lett.B. 559. 113 (2003)
• [Publications] K.Takahashi et al.: "Shock propagation and neutrino oscillation in supernova"Phys.Rev.D. 68. 023003 (2003)
• [Publications] K.Kohri et al.: "Upper limit on the mass of RX J1856.5-3754 as a possible quark star"Prog.Theor.Phys.. 109. 765-780 (2003)
• [Publications] S.Ando et al.: "Resonant spin-flavor conversion of supernova neutrinos : Dependence on presupernova models and future prospects"Phys.Rev.D. 68. 023003 (2003)
• [Publications] K.Kotake et al.: "Anisotropic Neutrino Radiation in Rotational Core Collapse"Astrophys.J.. 595. 304 (2003)
• [Publications] K.Kotake et al.: "Gravitational Radiation from Rotational Core Collapse : Effects of Magnetic Fields and Realistic Equation of States"Phys.Rev.D.. (in press). (2004)
• [Publications] K.Takahashi et al.: "Supernova Neutrinos, Neutrino Oscillations, and the Mass of the Progenitor Star"Phys.Rev D. 68. 113009 (2003)
• [Publications] G.Watanabe et al.: "Structure of Cold Nuclear matter at Subnuclear densities by Quantum Molecular Dynamics"Phys.Rev C. 68. 035806 (2003)
• [Publications] S.Ando et al.: "A comprehensive study of neutrino spin-flavor conversion in supernovae and the neutrino mass hierarchy"Jounal of Cosmology and Astroparticle Physics. 10. 001 (2003)
• [Publications] K.Kotake et al.: "Gravitational Collapse of Rotating Massive Stars"Nuclear Physics A. 718. 629c (2003)
• [Publications] H.Suzuki et al.: "Protoneutron star cooling with a new equation of state"Nuci.Phys.A.. 718. 703-705 (2003)
• [Publications] K.Sumiyoshi et al.: "Properties of a relativistic equation of state for collapse-driven supernovae"Nuci.Phys.A.. 730. 227-251 (2004)
• [Publications] A.Mizuta et al.: "Propagation and Dynamics of Relativistic Jets"Astrophys.J.. (in press). (2004)
• [Publications] Y.Mizuno et al.: "General Relativistic Magnetohydrodynamic Simulations of Collapsars"Astrophys.J.. (in press). (2004)
• [Publications] K.Kotake et al.: "Gravitational Radiation from Rotational Core Collapse : Effects of Magnetic Fields and Realistic Equation of States"Phys.Rev.D.. 68. 044023 (2003)
• [Publications] K.Kohri et al.: "Anisotropic e+e- Pressure due to QED Effects in Strong Magnetic Fields and Application to Entropy Production in Supernovae"Astroparticle Phys.. (in press). (2004)
• [Publications] K.Kotake et al.: "Magnetorotational Effects on Anisotropic Neutrino Emission and Convection in Core Collapse Supernovae"Astrophys.J.. (in press). (2004)
• [Publications] S.Yamada et al.: "Numerical Study on the Rotational Collapse of Strongly Magnetized Cores of Massive Stars"Astrophys.J.. (in press). (2004)
• [Publications] T.Totani: "Cluster-Cluster Microlensing as a Probe of Intracluster Stars, MACHOs, and Remnants of the First-Generation Stars"Astrophys.J.. 586. 735-744 (2003)
• [Publications] K.S.Kawabata et al.: "On the Spectrum and Sectropolarimetry of Type Ic Hypernova SN 2003dh/GRB 030329"Astrophys.J.. 593. L19-L22 (2003)
• [Publications] T.Totani: "A Failed Gamma-Ray Burst with Dirty Energetic Jets Spirited Away? New Implications for the GRB-SN Connection"Astrophys.J.. 598. 1151-1162 (2003)
• [Publications] C.P.Fragile et al.: "Constraints on models for TeV gamma rays from gamma-ray bursts"Astropart.Phys.. 20. 591 (2004)
• [Publications] H.Yoshiguchi et al.: "Small-Scale Clustering in the Isotropic Arrival Distribution of Ultra-High-Energy Cosmic Rays"Astrophys.J.. 586. 1211 (2003)
• [Publications] H.Yoshiguchi et al.: "Arrival Distribution of Ultra-High Energy Cosmic Rays : Prospects for the Future"Astrophys.J.. 592. 311-320 (2003)
• [Publications] S.Nagataki et al.: "Explosive Nucleosynthesis Associated with Formation of Jet-induce GRBs in Massive Stars"Astrophys.J.. 596. 401-413 (2003)
• [Publications] S.Nagataki: "High-Energy Neutrinos Produce by Interactions of Relativistic Protons in Shocked Pulsar Winds"Astrophys.J.. 600. 883-904 (2004)
• [Publications] H.Yoshiguchi et al.: "A New Method for Caiculating Arrival Distribution of Ultra-High Energy Cosmic Rays above 10^<19> eV"Astrophys.J.. 596. 1044-1052 (2003)
• [Publications] Y.Sendouda: "Constraints on the Mass Spectrum of Primordial Black Holes and Braneworld Parameters from the Diffuse Photon Background"Phys.Rev.D.. 68. 103510 (2003)
• [Publications] H.Yoshiguchi et al.: "Numerical Study on Propagation of Ultra-High Energy Cosmic Rays in the Galactic Magnetic Field"Astrophys.J.. (in press). (2004)
• [Publications] S.Ando: "Determining the Supernova Direction by Its Neutrinos"Prog. Theor. Phys.. 107. 957-966 (2002)
• [Publications] S.Nagataki: "Features of Neutrino Signals from Collapsars"Prog. Theor. Phys.. 108. 789-800 (2002)
• [Publications] K.Takahashi: "Earth effects on supernova neutrinos and their implications for neutrino parameters"Phys. Rev. D. 66. 033006 (2002)
• [Publications] G.Watanabe: "Microscopic study of slablike and rodlike nuclei : Quantum molecular dynamics approach"Phys. Rev. C. 66. 012801(R) (2002)
• [Publications] S.Ando: "Detectability of the supernova relic neutrinos and neutrino oscillation"Astropart. Phys.. 18. 307-318 (2003)
• [Publications] S.Nagataki: "Gamma-Ray Burst Neutrino Background and Star Formation History in the Universe"Astropart. Phys.. 18. 551-564 (2003)
• [Publications] S.Ando: "Three-generation study of neutrino spin-flavor conversion in supernova and implication for neutrino magnetic moment"Phys. Rev. D. 67. 023004 (2003)
• [Publications] H.Yoshiguchi: "Revision of the selection function of the Optical Redshift Survey using the Sloan digital Sky Survey : Early Data Release"Publ. Astron. Soc. Japan. 55. 121-131 (2003)
• [Publications] H.Yoshiguchi: "Small Scale Clustering in Isotropic Arrival Distribution of Ultra-High Energy Cosmic Rays and Implications for Their Source Candidates"Astrophys. J.. 586(印刷中). (2003)