Optical flashes and very early afterglows in wind environments

Optical flashes and very early afterglows in wind environments
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风环境中的闪光和极早余辉

DOI:
10.1046/j.1365-8711.2003.06602.x
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发表时间:
2003-04
影响因子:
4.8
通讯作者:
陆埮
陆埮
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
吴雪峰;戴子高;黄永锋;陆埮

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相对论性火球与周围介质的相互作用通过两个冲击波来描述:一个反向冲击波传播到火球中,一个正向冲击波传播到介质中。观测到的GRB 990123的闪光被认为是这种反向冲击的发射。余辉的观测性质表明,某些γ射线暴的前身可能是大质量恒星,其周围的介质可能是恒星风。我们在这里研究风中反向和正向激波的极早期余辉。光学闪光主要由相对论反向激波产生,而射电耀斑则由正向激波产生。如果我们不考虑沿着视线的一些适当的尘埃遮蔽,光学闪光的峰值通量密度大于1焦耳的典型参数。射电耀斑总是有一个持久的恒定通量,这不会被星际闪烁所掩盖。光闪烁的亮度超过约9等的非检测可能会限制伽玛射线暴各向同性能量不超过几个10 - 52尔格和风的强度是相对较弱的。
The interaction of a relativistic fireball with its ambient medium is described through two shocks: a reverse shock that propagates into the fireball, and a forward shock that propagates into the medium. The observed optical flash of GRB 990123 has been considered to be the emission from such a reverse shock. The observational properties of afterglows suggest that the progenitors of some γ -ray bursts (GRBs) may be massive stars and their surrounding media may be stellar winds. We here study very early afterglows from the reverse and forward shocks in winds. An optical flash mainly arises from the relativistic reverse shock, while a radio flare is produced by the forward shock. The peak flux densities of optical flashes are larger than 1 Jy for typical parameters, if we do not take into account some appropriate dust obscuration along the line of sight. The radio flare always has a long-lasting constant flux, which will not be covered up by interstellar scintillation. The non-detections of optical flashes brighter than about ninth magnitude may constrain the GRB isotropic energies to be no more than a few 10 52 erg and wind intensities to be relatively weak.
DOI: 10.1086/317869
发表时间: 2000-09
期刊: The Astrophysical Journal
影响因子: --
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发表时间: 1999-04
期刊: The Astrophysical Journal Letters
影响因子: --
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发表时间: 1998-06
影响因子: 4.8
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发表时间: 1999-03
期刊: The Astrophysical Journal
影响因子: --
作者:
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DOI: --
发表时间: 2000
期刊: --
影响因子: --
作者:
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