Possible observational evidence for the θ-2 angular distribution of the opening half-angle of gamma-ray burst jets

Monthly Notices of the Royal Astronomical Soceity 362 巻 3 号 1114-1118 頁 2005-09 発行
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タイトル ( eng )
Possible observational evidence for the θ-2 angular distribution of the opening half-angle of gamma-ray burst jets
作成者
Yonetoku Daisuke
Yamazaki Ryo
Nakamura Takashi
Murakami Toshio
収録物名
Monthly Notices of the Royal Astronomical Soceity
362
3
開始ページ 1114
終了ページ 1118
抄録
We propose a method to estimate the jet opening half-angle of gamma-ray bursts (GRBs) using the spectral peak energy (Ep)–peak luminosity relation (the so-called Yonetoku relation) as well as the Ep–collimation-corrected gamma-ray energy relation (the so-called Ghirlanda relation). For bursts with known jet break times and redshifts, we have compared the derived jet opening half-angle with that measured and found that the differences are within a factor of 2. We apply the method to 689 long GRBs. We have found that the distribution function of the derived jet opening half-angle obeys f(θj) θ-2.2±0.2j, although a lognormal fit is also possible. θ-2 distribution is compatible with the structured jet model. From the distribution function we have found that the beaming correction for the rate of GRBs is ~340, which means ~10-5 yr-1 galaxy-1 or only one in 102 Type Ib/c supernovae. We have also found the evolution of the distribution function as a function of the redshift.
著者キーワード
gamma-rays: bursts
gamma-rays: observations
gamma-rays: theory
NDC分類
天文学・宇宙科学 [ 440 ]
言語
英語
資源タイプ 学術雑誌論文
出版者
Blackwell
発行日 2005-09
権利情報
Copyright (c) 2005 Royal Astronomical Society
出版タイプ Author’s Original(十分な品質であるとして、著者から正式な査読に提出される版)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 0035-8711
[DOI] 10.1111/j.1365-2966.2005.09398.x
[DOI] http://dx.doi.org/10.1111/j.1365-2966.2005.09398.x ~の異版である