ON THE LATE-TIME SPECTRAL SOFTENING FOUND IN X-RAY AFTERGLOWS OF GAMMA-RAY BURSTS

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 宇宙伽马暴、中子星及相关物理研究团组

	ON THE LATE-TIME SPECTRAL SOFTENING FOUND IN X-RAY AFTERGLOWS OF GAMMA-RAY BURSTS
	Wang, Yuan-Zhu 1,2; Zhao, Yinan 3; Shao, Lang 4,5; Liang, En-Wei 1,2; Lu, Zu-Jia 1,2
刊名	ASTROPHYSICAL JOURNAL
	2016-02-20
卷号	818 期号:2
关键词	dust, extinction gamma-ray burst: general ISM: general scattering X-rays: general
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
语种	英语
WOS记录号	WOS:000372302800066
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/16178]
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.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
推荐引用方式 GB/T 7714	Wang, Yuan-Zhu,Zhao, Yinan,Shao, Lang,et al. ON THE LATE-TIME SPECTRAL SOFTENING FOUND IN X-RAY AFTERGLOWS OF GAMMA-RAY BURSTS[J]. ASTROPHYSICAL JOURNAL,2016,818(2).
APA	Wang, Yuan-Zhu,Zhao, Yinan,Shao, Lang,Liang, En-Wei,&Lu, Zu-Jia.(2016).ON THE LATE-TIME SPECTRAL SOFTENING FOUND IN X-RAY AFTERGLOWS OF GAMMA-RAY BURSTS.ASTROPHYSICAL JOURNAL,818(2).
MLA	Wang, Yuan-Zhu,et al."ON THE LATE-TIME SPECTRAL SOFTENING FOUND IN X-RAY AFTERGLOWS OF GAMMA-RAY BURSTS".ASTROPHYSICAL JOURNAL 818.2(2016).