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题名: ON THE LATE-TIME SPECTRAL SOFTENING FOUND IN X-RAY AFTERGLOWS OF GAMMA-RAY BURSTS
作者: Wang, Yuan-Zhu1, 2; Zhao, Yinan3; Shao, Lang4, 5; Liang, En-Wei1, 2; Lu, Zu-Jia1, 2
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-02-20
卷号: 818, 期号:2
关键词: dust, extinction ; gamma-ray burst: general ; ISM: general ; scattering ; X-rays: general
DOI: 10.3847/0004-637X/818/2/167
文章类型: Article
英文摘要: Strong spectral softening has been revealed in the late X-ray afterglows of some gamma-ray bursts (GRBs). The scenario of X-ray scattering around the circumburst dusty medium has been supported by previous works due to its overall successful prediction of both the temporal and spectral evolution of some X-ray afterglows. To further investigate the observed feature of spectral softening we now systematically search the X-ray afterglows detected by the X-ray telescope aboard Swift and collect 12 GRBs with significant late-time spectral softening. We find that dust scattering could be the dominant radiative mechanism for these X-ray afterglows regarding their temporal and spectral features. For some well-observed bursts with high-quality data, the time-resolved spectra could be well-produced within the scattering scenario by taking into account the X-ray absorption from the circumburst medium. We also find that during spectral softening the power-law index in the high-energy end of the spectra does not vary much. The spectral softening is mainly manifested by the spectral peak energy continually moving to the soft end.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: SWIFT XRT DATA ; DUST SCATTERING MODEL ; COMPREHENSIVE ANALYSIS ; LIGHT CURVES ; COMPLETE SAMPLE ; GRB 130925A ; THEORETICAL IMPLICATIONS ; ORIGIN ; PROGENITOR ; EVOLUTION
收录类别: SCI
项目资助者: National Basic Research Program of China(2014CB845800) ; National Natural Science Foundation of China(11361140349 ; Chinese Academy of Sciences(XDB09000000) ; Guangxi Science Foundation(2013GXNSFFA019001) ; 11103083 ; 11533003)
语种: 英语
WOS记录号: WOS:000372302800066
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16178
Appears in Collections:宇宙伽马暴、中子星及相关物理研究团组_期刊论文

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作者单位: 1.Guangxi Univ, Dept Phys, GXU NAOC Ctr Astrophys & Space Sci, Nanning 530004, Peoples R China
2.Guangxi Key Lab Relativist Astrophys, Nanning 530004, Guangxi, Peoples R China
3.Univ Florida, Dept Astron, Gainesville, FL 32611 USA
4.Hebei Normal Univ, Dept Space Sci & Astron, Shijiazhuang 050024, Peoples R China
5.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
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