ガンマ線バースト・極超新星に於ける爆発的元素合成

• Project Area: Research on the Emergence of Hierarchical Structure of Matter by Bridging Particle, Nuclear and Astrophysics in Computational Science
• Project/Area Number: 21105509
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyoto University
• Principal Investigator: 長滝 重博 (長瀧 重博) 京都大学, 基礎物理学研究所, 准教授 (60359643)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2010: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2009: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: ガンマ線バースト / 極超新星爆発 / ブラックホール / 爆発的元素合成 / 大規模数値シミュレーション / 超新星爆発 / 中性子星 / 元素合成 / 核反応 / 一般相対論 / 降着円盤

Research Abstract

ガンマ線バースト・極超新星の発生メカニズムは未解明なことが多く、コラプサーモデルという有力説はあるものの、極超新星の明るさを決定している56Niがいつ、どこで生成されているのか解明出来ていません。その原因は、コラプサーのダイナミクスをシミュレートするグループと、元素合成のシミュレーションを行っているグループがそれぞれ別個の計算をしており、ガンマ線バースト・極超新星の統一的な描像が描けていない点にあります。従って、この状況を打開するためには、コラプサーのダイナミクスをシミュレートするコードに充分な核反応計算を組み込み、長時間数値シミュレーションによって56Niがいつ、どこで、どれだけ生成されるのかを明らかにする方向性を探っていくことが必要不可欠です。このアプローチにより、極超新星に於ける56Ni生成問題について新しい知見を生み出すことが、本研究の大きな目的です。この目的達成のためにH22年度に於きましては特殊相対論的流体コード、及び一般相対論的磁気流体コードを開発してきました。幸いなことに双方ともにほぼ完成させることが出来ました。具体的には特殊相対論的流体コードは2次元軸対称コードで、ベクトル化、及び並列化を取り入れたコードとなっています。ベクトル化率はおよそ99%、並列化率はほぼ100%の数字を出すに至っており、満足のいく数字を達成しました。一般相対論的磁気流体コードは2次元軸対称コードと3次元コードを完成させました。こちらも共にベクトル化、及び並列化を取り入れたコードとなっており、ベクトル化率はおよそ99%、並列化率はほぼ100%の数字を達成しました。

Research Products

• [Journal Article] Solar-type Theoretical Model for Magnetar Giant Flare (2010)
  • Author(s): Y.Masada, S.Nagataki, K.Shibata, T.Terasaw
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 62 Pages: 1093-1102
  • Peer Reviewed
• [Journal Article] Can we probe the Lorentz factor of gamma-ray bursts from GeV-TeV spectra integrated over internal shocks? (2010)
  • Author(s): J.Aoi, K.Murase, K.Takahashi, K.Ioka, S.Nagataki
  • Journal Title: The Astrophysical Journal Volume: 722 Pages: 440-451
  • Peer Reviewed
• [Journal Article] Role of Galactic Sources and Magnetic Fields in Forming the Observed Energy-Dependent Composition of Ultrahigh-Energy Cosmic Rays (2010)
  • Author(s): Calvez, Antoine, Kusenko, Alexander, Nagataki, Shigehiro
  • Journal Title: Physical Review Letters Volume: 105
  • Peer Reviewed
• [Journal Article] An analysis of the temperature structure of galaxy clusters by means of the thermal Sunyaev-Zel'dovich effect (2010)
  • Author(s): D.A.Prokhorov, Y.Dubois, S.Nagataki
  • Journal Title: Astronomy and Astrophysics Volume: 524 Pages: 89-94
  • Peer Reviewed
• [Journal Article] High-energy emission as a test of the prior emission model for gamma-ray burst afterglows (2010)
  • Author(s): K.Murase, K.Toma, R.Yamazaki, S.Nagataki, K.Ioka
  • Journal Title: Monthly Notices of the Royal Astronomical Society 402
  • Peer Reviewed
• [Journal Article] Development of General Relativistic Magnetohydrodynamic Code and its Application to Central Engine of Long Gamma-Ray Bursts (2009)
  • Author(s): S.Nagataki
  • Journal Title: The Astrophysical Journal 704 Pages: 937-950
  • Peer Reviewed
• [Journal Article] Propagation of Ultra-High energy Nuclei in Cluster of Galaxies : Resulting Composition and Secondary Emission (2009)
  • Author(s): K.Kotera, D.Allard, K.Murase, J.Aoi, Y.Dubois, T.Pierog, S.Nagataki
  • Journal Title: The Astrophysical Journal 707 Pages: 370-386
  • Peer Reviewed
• [Journal Article] Possible Effects of Pair Echos on Gamma-Ray Burst Afterglow Emission (2009)
  • Author(s): K.Murase, B.Zhang, K.Takahashi, S.Nagataki
  • Journal Title: Monthly Notices of the Royal Astronomical Society 396 Pages: 1825-1832
  • Peer Reviewed
• [Journal Article] Cosmogenic Neutrinos as a Probe of the Transition from Galactic to Extragalactic Cosmic Rays (2009)
  • Author(s): H.Takami, K.Murase, S.Nagataki, K.Sato
  • Journal Title: Astroparticle Physics 31 Pages: 201-211
  • Peer Reviewed
• [Journal Article] A peculiar jet and arc of molecular gas toward the rich and young stellar cluster Westerlund 2 and a TeV gamma ray source (2009)
  • Author(s): Fukui, S.Nagataki, et al.
  • Journal Title: Publication of Astronomical Society of Japan 61
  • NAID: 10025599967
  • Peer Reviewed
• [Presentation] Gamma-Ray Bursts (2011)
  • Author(s): 長滝重博
  • Organizer: 超新星研究会
  • Place of Presentation: 国立天文台、三鷹市(招待講演)
  • Year and Date: 2011-03-03
• [Presentation] 研究の現状と展望 (2011)
  • Author(s): 長滝重博
  • Organizer: 若手・中堅研究者が見据える次世代宇宙物理
  • Place of Presentation: チサンリゾート、石垣市(招待講演)
  • Year and Date: 2011-02-24
• [Presentation] ガンマ線バーストジェット形成と元素合成 (2011)
  • Author(s): 長滝重博
  • Organizer: 次世代スーパーコンピュータによる爆発的天体現象の研究
  • Place of Presentation: 琉球大、沖縄県西原町
  • Year and Date: 2011-01-31
• [Presentation] Astro-Hに向けた超新星残骸プラズマ研究 (2010)
  • Author(s): 長滝重博
  • Organizer: Astro-H研究会
  • Place of Presentation: 東京理科大、東京都新宿区(招待講演)
  • Year and Date: 2010-12-27
• [Presentation] Numerical Propagation of UHECRs : Spectrum, Arrival Direction, Composition (2010)
  • Author(s): Shigehiro Nagataki
  • Organizer: Texas Symposium 2010
  • Place of Presentation: Heidelberg's Magnificent Stadthalle, Heidelberg, Germany
  • Year and Date: 2010-12-06
• [Presentation] Collapsar Simulations : From Engine to Relativistic Outflow, and 56Ni Production (2010)
  • Author(s): Shigehiro Nagataki
  • Organizer: Texas Symposium 2010
  • Place of Presentation: Heidelberg's Magnificent Stadthalle, Heidelberg, Germany
  • Year and Date: 2010-12-06
• [Presentation] Ultra-High Energy Cosmic Rays and Neutrinos (2010)
  • Author(s): Shigehiro Nagataki
  • Organizer: XIV Mexican School on Particles and Fields
  • Place of Presentation: Fiesta Inn Hotel, Morelia, Mexico(招待講演)
  • Year and Date: 2010-11-11
• [Presentation] Gamma-Ray Burst Physics (2010)
  • Author(s): Shigehiro Nagataki
  • Organizer: XIV Mexican School on Particles and Fields
  • Place of Presentation: Fiesta Inn Hotel, Morelia, Mexico(招待講演)
  • Year and Date: 2010-11-10
• [Presentation] Collapsar Simulations : From Engine to Relativistic Outflow, and 56Ni Production (2010)
  • Author(s): Shigehiro Nagataki
  • Organizer: Gamma-Ray Burst 2010
  • Place of Presentation: Historic Inns of Annapolis Annapolis, USA
  • Year and Date: 2010-11-02
• [Presentation] Gamma-Ray Burst Physics (2010)
  • Author(s): Shigehiro Nagataki
  • Organizer: APCTP-Topical-Research-Program-2010
  • Place of Presentation: APCTP, Seoul, Korea(招待講演)
  • Year and Date: 2010-08-18
• [Presentation] Nonlinear Relativistic Jet Formation and Gamma-Ray bursts (2010)
  • Author(s): Shigehiro Nagataki
  • Organizer: Frontiers of Nonlinear Physics IV
  • Place of Presentation: Nizhny, Russia(招待講演)(船上にて発表)
  • Year and Date: 2010-07-14
• [Presentation] GRB-SN Connection : Central Engine of Long GRBs and Explosive Nucleosynthesis (2010)
  • Author(s): Shigehiro Nagataki
  • Organizer: Deciphering the Ancient Universe with Gamma-Ray Bursts
  • Place of Presentation: 京都大学、京都市
  • Year and Date: 2010-04-20
• [Presentation] GRB-SN Connection : Central Engine of Long GRBs and Explosive Nucleosynthesis (2009)
  • Author(s): S.Nagataki
  • Organizer: Galileo-Xu Guangqi meeting
  • Place of Presentation: Shanghai, China
  • Year and Date: 2009-10-28
• [Presentation] GRB-SN Connection : Central Engine of Long GRBs and Explosive Nucleosynthesis (2009)
  • Author(s): S.Nagataki
  • Organizer: The Shocking Universe" Gamma-Ray Bursts and High Energy Shock phenomena
  • Place of Presentation: Venice, Italy
  • Year and Date: 2009-09-16
• [Presentation] Ultra-High Energy Cosmic Rays and Cosmogenic Neutrinos (2009)
  • Author(s): S.Nagataki
  • Organizer: APCTP Focus Program on Recent Developments in Neutrino Physics and Astroparticle Physics
  • Place of Presentation: Pohang, Korea
  • Year and Date: 2009-06-25
• [Presentation] Toward Understanding of GRB-Supernova Connection by General Relativistic MHD Simulation (2009)
  • Author(s): S.Nagataki
  • Organizer: APCTP Focus Program on Recent Developments in Neutrino Physics and Astroparticle Physics
  • Place of Presentation: Pohang, Korea
  • Year and Date: 2009-06-24
• [Presentation] High-Energy Neutrino Astronomy and Gamma-Ray Bursts (2009)
  • Author(s): S.Nagataki
  • Organizer: APCTP Focus Program on Recent Developments in Neutrino Physics and Astroparticle Physics
  • Place of Presentation: Pohang, Korea
  • Year and Date: 2009-06-23
• [Presentation] Toward Understanding of GRB-Supernova Connection by General Relativistic MHD Simulation (2009)
  • Author(s): S.Nagataki
  • Organizer: 4th International Sakharov Conference on Physics
  • Place of Presentation: Moscow, Russia
  • Year and Date: 2009-05-23
• [Presentation] A Key to Understand Supernova-GRB Connection : Explosive Nucleosynthesis (2009)
  • Author(s): S.Nagataki
  • Organizer: KIAA Program on GRB Physics
  • Place of Presentation: Beijing, China
  • Year and Date: 2009-05-21
• [Presentation] Toward Understanding of GRB-Supernova Connection by General Relativistic MHD Simulation (2009)
  • Author(s): S.Nagataki
  • Organizer: KIAA Program on GRB Physics
  • Place of Presentation: Beijing, China
  • Year and Date: 2009-05-20
• [Presentation] High-Energy Neutrino Astronomy and Gamma-Ray Bursts (2009)
  • Author(s): S.Nagataki
  • Organizer: KIAA Program on GRB Physics
  • Place of Presentation: Beijing, China
  • Year and Date: 2009-05-18