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

• Ohno, Masanori

• Ioka, Kunihito

• Yamaoka, Kazutaka

• 田代, 信

• Fukazawa, Yasushi

• Nakagawa, Yujin E.

抄録

type:text

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.

収録刊行物

• Publications of the Astronomical Society of Japan

  Publications of the Astronomical Society of Japan 61 (2), 201-211, 2009

  Astronomical Society of Japan

キーワード

• gamma rays: burst
• gamma rays: observations
• gamma-ray bursts
• all-sky monitor
• spectral hardness
• photospheres
• intensity
• catalog

詳細情報

• CRID: 1050282812795544960
• NII論文ID: 10025598189
• NII書誌ID: AA1082896X
• ISSN: 00046264
• NDL書誌ID: 10208550
• Web Site: http://id.nii.ac.jp/1586/00013426/
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10208550
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • NDL
  • CiNii Articles
  • KAKEN