The optical flare and afterglow light curve of GRB 050904 at redshift z=6.29

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 optical flare and afterglow light curve of GRB 050904 at redshift z=6.29
	Wei, DM; Yan, T ; Fan, YZ
刊名	ASTROPHYSICAL JOURNAL
	2006-01-10
卷号	636 期号:2 页码:L69-L72
关键词	gamma rays : bursts ISM : jets and outflows radiation mechanisms : nonthermal
ISSN号	0004-637X
英文摘要	GRB 050904 is very interesting, since it is by far the most distant gamma-ray burst event known to date (z = 6.29). It was reported that during the prompt high-energy emission phase, a very bright optical flare was detected that was temporally coincident with an X-ray flare. Here we use two models to explain the optical flare. One is the "late internal shock model," in which the optical flare is produced by the synchrotron radiation of the electrons accelerated by the late internal shock and the X-ray flare is produced by the synchrotron self-Compton mechanism. The other is the external forward-reverse shock model, in which the optical flare is from the reverse-shock emission and the X-ray flare is attributed to the activity of the central engine. We show that with the proper parameters, a bright optical flare can appear in either model. We think that the late internal shock model is more favored, since in this model the optical flash and the X-ray flare have the same origin, which provides a natural explanation of their temporal coincidence. In the forward-reverse shock scenario, fits to the optical flare and the late afterglow suggest that the physical parameters of the reverse shock are much different from those of the forward shock, as found in previous modeling of the optical flash of GRB 990123.
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
关键词[WOS]	GAMMA-RAY-BURST ; REVERSE-SHOCK ; PHYSICAL PARAMETERS ; ENERGY INJECTION ; EMISSION ; MODEL ; GRB-990123 ; FLASH ; GRB-021211 ; ENGINE
收录类别	SCI
语种	英语
WOS记录号	WOS:000234469700003
公开日期	2012-02-07
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/3614]
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.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Wei, DM,Yan, T,Fan, YZ. The optical flare and afterglow light curve of GRB 050904 at redshift z=6.29[J]. ASTROPHYSICAL JOURNAL,2006,636(2):L69-L72.
APA	Wei, DM,Yan, T,&Fan, YZ.(2006).The optical flare and afterglow light curve of GRB 050904 at redshift z=6.29.ASTROPHYSICAL JOURNAL,636(2),L69-L72.
MLA	Wei, DM,et al."The optical flare and afterglow light curve of GRB 050904 at redshift z=6.29".ASTROPHYSICAL JOURNAL 636.2(2006):L69-L72.