Shao 2007 尘埃散射作为X射线余辉的来源

主要内容:
一部分伽玛暴的X射线余辉来自于暴本身的辐射被尘埃散射的结果。

精彩摘抄:


文章信息:
Behavior of X-Ray Dust Scattering and Implications for X-Ray Afterglows of Gamma-Ray Bursts

Authors: L. Shao, Z. G. Dai (NJU)

(Submitted on 1 Mar 2007 (v1), last revised 30 Mar 2007 (this version, v2))

Abstract: The afterglows of gamma-ray bursts (GRBs) have commonly been assumed to be due to shocks sweeping up the circum-stellar 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.

Comments:

ApJ, in press

Subjects:

Astrophysics (astro-ph)

Cite as:

arXiv:astro-ph/0703009v2