Time-Evolution of Peak Energy and Luminosity Relation within Pulses for GRB 061007: Probing Fireball Dynamics

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概要

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• We performed a time-resolved spectral analysis of a bright, long gamma-ray burst GRB 061007 using Suzaku/WAM and Swift/BAT. Because of the large effective area of the WAM, we can investigate the time evolution of the spectral peak energy E-peak(t) and the luminosity L-iso(t) with 1-s time resolution, and we find that the time-resolved pulses also satisfy the E-peak-L-iso relation, which was found for the time-averaged spectra of other bursts, suggesting the same physical conditions in each pulse. Furthermore, the initial rising phase of each pulse could be an outlier of this relation with higher E-peak(t) Value by a factor of 2. This difference could Suggest that the fireball radius expands by a factor of 2-4 and / or bulk Lorentz factor of the fireball is decelerated by a factor of similar to 4 during the initial phase, providing a new probe of fireball dynamics in real time.

• 2009-04-25

著者

• 田代 信

  埼大理

• TASHIRO Makoto

  Department of Physics, Saitama University

• FUKAZAWA Yasushi

  Department of Physical Sciences, School of Science, Hiroshima University

• YAMAOKA Kazutaka

  Department of Physics and Mathematics, Aoyama Gakuin University

• OHNO Masanori

  Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA)

• IOKA Kunihito

  Theory Division, KEK (High Energy Accelerator Research Organization)

• NAKAGAWA Yujin

  Institute of Physical and Chemical Research (RIKEN)

• NAKAGAWA Yujin

  Dept. of Physics, Aoyama Gakuin University

• YAMAOKA Kazutaka

  Dept. of Physics, Aoyama Gakuin University

• MIHARA Tatehiro

  The Institute of Physical and Chemical Research

• Ioka Kunihito

  Theory Division Kek (high Energy Accelerator Research Organization)

• Nakagawa Y

  Inst. Physical And Chemical Res. Saitama

• Ozaki M

  Institute Of Space And Astronautical Science Jaxa

• Ozaki Masanobu

  和歌山県立医科大学 薬理学教室

• MIZUNO Tsunefumi

  SLAG

• KOMIYAMA Yutaka

  National Astronomical Observatory of Japan

• Ohno Masanori

  Japan Aerospace Exploration Agency Sagamihara

• FUKAZAWA Yasushi

  Dep. of Phys., Hiroshima University

• OHNO Masanori

  Dep. of Phys., Hiroshima University

• Yamada Kazuhiko

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• Yamaoka Kazutaka

  Aoyama Gakuin Univ. Sagamihara

• Komiyama Yutaka

  Subaru Telescope National Astronomical Observatory

• Ozaki Masanobu

  Institute Of Space And Astronautical Science Jaxa

• Yamaoka Kazutaka

  Department Of Physics And Mathematics Aoyama Gakuin University

• Fukazawa Y

  Department Of Physical Science Hiroshima University

• Fukazawa Yasushi

  Department Of Physical Science Hiroshima University

• Sasada Mahito

  National Astronomical Observatory Of Japan

• Mitani Takefumi

  Department Of Physical Science Hiroshima University

• Ohno Masanori

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• Tashiro Makoto

  Department Of Astronomy And Astrophysics Pennsylvania State University

• Tsujimoto Masahiro

  Department Of Astronomy And Astrophysics Pennsylvania State University

• Tashiro Makoto

  Saitama Univ. Saitama

• Ohno Masanori

  Institute Of Space And Astronautical Science (isas/jaxa)

• Ozaki Masanobu

  JAXA/Institute of Space and Astronautical Science

• OZAKI Masanobu

  Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)

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