SPECTRAL SOFTENING IN THE X-RAY AFTERGLOW OF GRB 130925A AS PREDICTED BY THE DUST SCATTERING MODEL
文献类型：期刊论文
| 作者 | Zhao, Yi-Nan1; Shao, Lang1,2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2014-07-01 |
| 卷号 | 789期号:1页码:0 |
| 关键词 | dust, extinction gamma-ray burst: general ISM: general scattering X-rays: general |
| ISSN号 | 0004-637X |
| 英文摘要 | Gamma-ray bursts (GRBs) usually occur in a dense star-forming region with a massive circumburst medium. The small-angle scattering of intense prompt X-ray emission off the surrounding dust grains will have observable consequences and sometimes can dominate the X-ray afterglow. In most of the previous studies, only the Rayleigh-Gans (RG) approximation is employed for describing the scattering process, which works accurately for the typical size of grains (with radius of a <= 0.1 mu m) in the diffuse interstellar medium. When the size of the grains may significantly increase, as in a more dense region where GRBs would occur, the RG approximation may not be valid enough for modeling detailed observational data. In order to study the temporal and spectral properties of the scattered X-ray emission more accurately with potentially larger dust grains, we provide a practical approach using the series expansions of anomalous diffraction (AD) approximation based on the complicated Mie theory. We apply our calculations to understand the puzzling X-ray afterglow of recently observed GRB 130925A that showed a significant spectral softening. We find that the X-ray scattering scenarios with either AD or RG approximation adopted could well reproduce both the temporal and spectral profile simultaneously. Given the plateau present in the early X-ray light curve, a typical distribution of smaller grains as in the interstellar medium would be suggested for GRB 130925A. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | BURST HOST GALAXIES ; SMALL-ANGLE SCATTERING ; STAR-FORMING REGIONS ; MASSIVE BLACK-HOLE ; INTERSTELLAR GRAINS ; RELATIVISTIC OUTFLOW ; EXTRAGALACTIC DUST ; EXTINCTION CURVES ; COMPLETE SAMPLE ; EVOLUTION |
| 收录类别 | SCI |
| 原文出处 | 10.1088/0004-637X/789/1/74 |
| 语种 | 英语 |
| WOS记录号 | WOS:000338103400074 |
| 公开日期 | 2014-11-21 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10706]  |
| 专题 | 紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组 |
| 作者单位 | 1.Hebei Normal Univ, Dept Space Sci & Astron, Shijiazhuang 050024, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Yi-Nan,Shao, Lang. SPECTRAL SOFTENING IN THE X-RAY AFTERGLOW OF GRB 130925A AS PREDICTED BY THE DUST SCATTERING MODEL[J]. ASTROPHYSICAL JOURNAL,2014,789(1):0. |
| APA | Zhao, Yi-Nan,&Shao, Lang.(2014).SPECTRAL SOFTENING IN THE X-RAY AFTERGLOW OF GRB 130925A AS PREDICTED BY THE DUST SCATTERING MODEL.ASTROPHYSICAL JOURNAL,789(1),0. |
| MLA | Zhao, Yi-Nan,et al."SPECTRAL SOFTENING IN THE X-RAY AFTERGLOW OF GRB 130925A AS PREDICTED BY THE DUST SCATTERING MODEL".ASTROPHYSICAL JOURNAL 789.1(2014):0. |
入库方式： OAI收割
来源：紫金山天文台
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