The ultraviolet flash accompanying gamma-ray bursts from neutron-rich internal shocks

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	The ultraviolet flash accompanying gamma-ray bursts from neutron-rich internal shocks
	Fan, YZ; Wei, DM
刊名	ASTROPHYSICAL JOURNAL
	2004-11-10
卷号	615 期号:2 页码:L69-L72
关键词	gamma rays : bursts radiation mechanisms : nonthermal shock waves
ISSN号	0004-637X
英文摘要	In the neutron-rich internal shocks model for gamma-ray bursts (GRBs), the Lorentz factors (LFs) of ion shells are variable, and so are the LFs of accompanying neutron shells. For slow neutron shells with a typical LF of approximately tens, the typical beta-decay radius reads R-beta,R-s similar to several x 10(14) cm, which is much larger than the typical internal shocks radius similar to 10(13) cm, so their impact on the internal shocks may be unimportant. However, as GRBs last long enough [T-90 > 20(1+z) s], one earlier but slower ejected neutron shell will be swept successively by later ejected ion shells in the range similar to 10(13) - 10(15) cm, where slow neutrons have decayed significantly. We show in this work that ion shells interacting with the beta-decay products of slow neutron shells can power a UV flash bright to the 12th magnitude during the prompt gamma-ray emission phase or slightly delayed, which could be detected by the upcoming satellite Swift in the near future.
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]	GEV NEUTRINOS ; AFTERGLOWS ; FIREBALLS ; EMISSION ; JETS
收录类别	SCI
语种	英语
WOS记录号	WOS:000225046600002
公开日期	2012-12-22
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/7744]
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 3.Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA
推荐引用方式 GB/T 7714	Fan, YZ,Wei, DM. The ultraviolet flash accompanying gamma-ray bursts from neutron-rich internal shocks[J]. ASTROPHYSICAL JOURNAL,2004,615(2):L69-L72.
APA	Fan, YZ,&Wei, DM.(2004).The ultraviolet flash accompanying gamma-ray bursts from neutron-rich internal shocks.ASTROPHYSICAL JOURNAL,615(2),L69-L72.
MLA	Fan, YZ,et al."The ultraviolet flash accompanying gamma-ray bursts from neutron-rich internal shocks".ASTROPHYSICAL JOURNAL 615.2(2004):L69-L72.