Jet sideways expansion effect on estimating the gamma-ray burst efficiency

doi:10.1086/510449

YNAO OpenIR > 高能天体物理研究组

	Jet sideways expansion effect on estimating the gamma-ray burst efficiency
	Zhao XH(赵晓红)1,2 ; Bai JM(白金明)1 ; Zhao, XH (reprint author), Chinese Acad Sci, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊	ASTROPHYSICAL JOURNAL
	2006-12-10
卷号	653 期号:1 页码:L1-L4
DOI	10.1086/510449
产权排序	第1完成单位
收录类别	SCI
关键词	Gamma Rays : Bursts Gamma Rays : Observations
摘要	The high efficiency of converting kinetic energy into gamma rays estimated with late-time afterglows in gammaray burst (GRB) phenomenon challenges the commonly accepted internal-shock model. However, the efficiency is still highly uncertain because it is sensitive to many effects. In this Letter we study the sideways expansion effect of jets on estimating the efficiency. We find that this effect is considerable, reducing the efficiency by a factor of similar to 0.5 for typical parameters, when the afterglow data similar to 10 hr after the GRB trigger are used to derive the kinetic energy. For a more dense circumburst medium, this effect is more significant. As samples, taking this effect into account, we specifically calculate the efficiency of two bursts whose parameters were well constrained. Almost the same results are derived. This suggests that the sideways expansion effect should be considered when the GRB efficiency is estimated with the late afterglow data.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-637X
URL	查看原文
归档日期	2006-12-05
WOS记录号	WOS:000242914000001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	AFTERGLOW LIGHT CURVES ; INTERNAL SHOCKS ; KINETIC-ENERGY ; ENERGETICS ; EVOLUTION
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4944
专题	高能天体物理研究组
通讯作者	Zhao, XH (reprint author), Chinese Acad Sci, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China 2.Graduate School of the Chinese Academy of Sciences, 100012 Beijing, China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Zhao XH,Bai JM,Zhao, XH . Jet sideways expansion effect on estimating the gamma-ray burst efficiency[J]. ASTROPHYSICAL JOURNAL,2006,653(1):L1-L4.
APA	Zhao XH,Bai JM,&Zhao, XH .(2006).Jet sideways expansion effect on estimating the gamma-ray burst efficiency.ASTROPHYSICAL JOURNAL,653(1),L1-L4.
MLA	Zhao XH,et al."Jet sideways expansion effect on estimating the gamma-ray burst efficiency".ASTROPHYSICAL JOURNAL 653.1(2006):L1-L4.

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