The evolution of gamma-ray burst remnants

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 宇宙伽马暴、中子星及相关物理研究团组

	The evolution of gamma-ray burst remnants
	Wei, DM; Lu, T
刊名	ASTROPHYSICAL JOURNAL
	1998-06-01
卷号	499 期号:2 页码:754-757
关键词	gamma rays, bursts radiation mechanisms, nonthermal
ISSN号	0004-637X
英文摘要	The detection of the delayed emission in X-ray, optical, and radio bands, i.e., the afterglow of gamma-ray bursts (GRBs), suggests that the sources of GRBs are likely to be at cosmological distances. Here we explore the interaction of a relativistic shell with a uniform interstellar medium (ISM) and obtain the exact solution of the evolution of gamma-ray burst remnants, including the radiative losses. We show that in general the evolution of the bulk Lorentz factor, gamma, satisfies gamma proportional to t(-alpha t) when gamma much greater than 1; here, alpha(t) is mainly in the range 9/22-3/8, the latter corresponding to adiabatic expansion. So it is clear that adiabatic expansion is a good approximation even when radiative loss is considered. However, in fact, alpha(t) is slightly larger than 3/8, which may have some effects on a detailed data analysis. Synchrotron self-absorption is also calculated, and it is demonstrated that the radio emission may become optically thin during the afterglow. Our solution can also apply to the nonrelativistic case (gamma similar to 1); at that time, the observed flux decreases more rapidly than that in the relativistic case.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
收录类别	SCI
语种	英语
WOS记录号	WOS:000074172200022
公开日期	2013-02-05
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8356]
专题	紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组
作者单位	1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
推荐引用方式 GB/T 7714	Wei, DM,Lu, T. The evolution of gamma-ray burst remnants[J]. ASTROPHYSICAL JOURNAL,1998,499(2):754-757.
APA	Wei, DM,&Lu, T.(1998).The evolution of gamma-ray burst remnants.ASTROPHYSICAL JOURNAL,499(2),754-757.
MLA	Wei, DM,et al."The evolution of gamma-ray burst remnants".ASTROPHYSICAL JOURNAL 499.2(1998):754-757.