An off-axis jet model for GRB 980425 and low-energy gamma-ray bursts
Astrophysical Journal Letters 594 巻 2 号
2003-10 頁
2003-09 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
An off-axis jet model for GRB 980425 and low-energy gamma-ray bursts
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| 作成者 |
Yamazaki Ryo
Yonetoku Daisuke
Nakamura Takashi
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| 収録物名 |
Astrophysical Journal Letters
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| 巻 | 594 |
| 号 | 2 |
| 開始ページ | 2003 |
| 終了ページ | 10 |
| 抄録 |
Using a simple off-axis jet model of gamma-ray bursts (GRBs), we can reproduce the observed unusual properties of the prompt emission of GRB 980425, such as the extremely low isotropic equivalent γ-ray energy, the low peak energy, the high fluence ratio, and the long spectral lag when the jet with the standard energy of ∼1051 ergs and the opening half-angle of 10&j0; ≲ Δ&thetas; ≲ 30&j0; is seen from the off-axis viewing angle &thetas;v ∼ Δ&thetas; + 10γ-1, where γ is a Lorentz factor of the jet. For our adopted fiducial parameters, if the jet that caused GRB 980425 is viewed from the on-axis direction, the intrinsic peak energy Ep(1 + z) is ∼2.0–4.0 MeV, which corresponds to those of GRB 990123 and GRB 021004. We also discuss the connection of GRB 980425 in our model with the X-ray flash, and the origin of a class of GRBs with small Eγ.
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| 著者キーワード |
gamma rays
bursts
theory
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| NDC分類 |
地球科学・地学・地質学 [ 450 ]
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| 言語 |
英語
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| 資源タイプ | 学術雑誌論文 |
| 出版者 |
University of Chicago Press
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| 発行日 | 2003-09 |
| 権利情報 |
Copyright (c) 2003 The American Astronomical Society
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| 出版タイプ | Version of Record（出版社版。早期公開を含む） |
| アクセス権 | オープンアクセス |
| 収録物識別子 |
[ISSN] 0004-637X
[DOI] 10.1086/378736
[DOI] http://dx.doi.org/10.1086/378736
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