Testing the external-shock model of gamma-ray bursts using the late-time simultaneous optical and X-ray afterglows

	Testing the external-shock model of gamma-ray bursts using the late-time simultaneous optical and X-ray afterglows
	Urata, Yuji ; Yamazaki, Ryo ; Sakamoto, Takanori ; Huang, Kuiyun ; Zheng, Weikang ; Sato, Goro ; Aoki, Tsutomu ; Deng, Jinsong; Ioka, Kunihito ; Ip, WingHuen
刊名	ASTROPHYSICAL JOURNAL
	2007-10-20
卷号	668 期号:2 页码:L95-L98
关键词	gamma rays : bursts gamma rays : observations
英文摘要	We study the "normal" decay phase of the X- ray afterglows of gamma- ray bursts ( GRBs), which follows the shallow decay phase, using the events simultaneously observed in the R band. The classical external- shock model - in which neither the delayed energy injection nor time dependency of shock microphysics is considered shows that the decay indices of the X- ray and R- band light curves, alpha(x) and alpha(o), obey a certain relation, and that in particular, alpha(o) - alpha(x) should be larger than -1/4 unless the ambient density increases with the distance from the central engine. For our selected 14 samples, we have found that four events violate the limit at more than the 3 sigma level, so that a fraction of events are outliers of the classical external-shock model at the "normal" decay phase.
收录类别	SCI
语种	英语
WOS记录号	WOS:000250083000001
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7234]
专题	国家天文台_空间科学研究部
作者单位	1.Saitama Univ, Dept Phys, Shimo Okubo, Saitama 3388570, Japan 2.Hiroshima Univ, Dept Phys, Hiroshima 7398526, Japan 3.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA 4.Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 6.Univ Tokyo, Inst Astron, Kiso Observ, Nagano 3970101, Japan 7.Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068602, Japan 8.Natl Cent Univ, Inst Astron, Chungli 32054, Taiwan 9.Hiroshima Univ, Ctr Astrophys Sci, Hiroshima 7398536, Japan
推荐引用方式 GB/T 7714	Urata, Yuji,Yamazaki, Ryo,Sakamoto, Takanori,et al. Testing the external-shock model of gamma-ray bursts using the late-time simultaneous optical and X-ray afterglows[J]. ASTROPHYSICAL JOURNAL,2007,668(2):L95-L98.
APA	Urata, Yuji.,Yamazaki, Ryo.,Sakamoto, Takanori.,Huang, Kuiyun.,Zheng, Weikang.,...&Yamashita, Takuya.(2007).Testing the external-shock model of gamma-ray bursts using the late-time simultaneous optical and X-ray afterglows.ASTROPHYSICAL JOURNAL,668(2),L95-L98.
MLA	Urata, Yuji,et al."Testing the external-shock model of gamma-ray bursts using the late-time simultaneous optical and X-ray afterglows".ASTROPHYSICAL JOURNAL 668.2(2007):L95-L98.