Behavior of X‐Ray Dust Scattering and Implications for X‐Ray Afterglows of Gamma‐Ray Bursts | Zendy

L. Shao | Zendy; Zi-Gao Dai | Zendy

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Behavior of X‐Ray Dust Scattering and Implications for X‐Ray Afterglows of Gamma‐Ray Bursts

Author(s) -

L. Shao,

Zi-Gao Dai

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/513139

Subject(s) - physics , astrophysics , gamma ray burst , x ray , scattering , afterglow , gamma ray , astronomy , optics

The afterglows of gamma-ray bursts (GRBs) have commonly been assumed to bedue to shocks sweeping up the circum-stellar medium. However, most GRBs havebeen found in dense star-forming regions where a significant fraction of theprompt X-ray emission can be scattered by dust grains. Here we revisit thebehavior of dust scattering of X-rays in GRBs. We find that the features ofsome X-ray afterglows from minutes to days after the gamma-ray triggers areconsistent with the scattering of prompt X-ray emission from GRBs off host dustgrains. This implies that some of the observed X-ray afterglows (especiallythose without sharp rising and decaying flares) could be understood with adust-scattering--driven emission model.Comment: ApJ, in pres

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