Wang 2009 后退的那个喷流的余辉

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精彩摘抄:

虚线是后退喷流的贡献. 如果参数不同, 贡献可以更大.


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· arXiv e-print (arXiv:0903.3119)

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Title:		On the afterglow from the receding jet of gamma-ray burst
Authors:		Wang, Xin; Huang, Y. F.; Kong, Si-Wei
Publication:		eprint arXiv:0903.3119
Publication Date:		03/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		Submitted to A&A on 2009-01-06; 10 pages, 7 figures
Bibliographic Code:		2009arXiv0903.3119W

Abstract

According to popular progenitor models of gamma-ray bursts, twin jets should be launched by the central engine, with a preceding jet moving toward the observer and a receding jet moving backwardly. However, in calculating the afterglows, usually only the emission from the preceding jet is considered. Here we present a detailed numerical study on the afterglow from the receding jet. Our calculation is based on a generic dynamical description, and includes some delicate ingredients such as the effect of the equal arrival time surface. It is found that the emission from the receding jet is generally rather weak. In radio bands, it usually peaks at a time of $t \geq 1000$ d, with the peak flux nearly 4 magnitudes lower than the peak flux of the preceding jet. Also, it usually manifests as a short plateau in the total afterglow light curve, but not as an obvious rebrightening as once expected. In optical bands, the contribution from the receding jet is even weaker, with the peak flux being $\sim 8$ magnitudes lower than the peak flux of the preceding jet. We thus argue that the emission from the receding jet is very difficult to detect. However, in some special cases, i.e., when the circum-burst medium density is very high, or if the parameters of the receding jet is quite different from those of the preceding jet, the emission from the receding jet can be significantly enhanced and may still emerge as a marked rebrightening. We suggest that the search for receding jet emission should mostly concentrate on nearby gamma-ray bursts, and the observation campaign should last for at least several hundred days for each event.

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