Behavior of X-ray dust scattering and implications for X-ray afterglows of gamma-ray bursts

被引：67

作者：

Shao, L. ^{[1
]}

Dai, Z. G. ^{[1
]}

机构：

[1] Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 660卷 / 02期

关键词：

dust; extinction; gamma rays : bursts; ISM : general; X-rays : general;

D O I：

10.1086/513139

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The afterglows of gamma-ray bursts (GRBs) have commonly been assumed to be due to shocks sweeping up the circumstellar medium. However, most GRBs have been found in dense star-forming regions where a significant fraction of the prompt X-ray emission can be scattered by dust grains. Here we revisit the behavior of dust scattering of X-rays in GRBs. We find that the features of some X-ray afterglows from minutes to days after the gamma-ray triggers are consistent with the scattering of prompt X-ray emission from GRBs off host dust grains. This implies that some of the observed X-ray afterglows ( especially those without sharp rising and decaying flares) could be understood with a dust-scattering-driven emission model.

引用

页码：1319 / 1325

页数：7

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