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题名: A CORRELATED STUDY OF OPTICAL AND X-RAY AFTERGLOWS OF GRBs
作者: Li, Liang1, 2, 3; Wu XueFeng(吴雪峰)4, 5, 6, 7; Huang, Yong-Feng8, 9; Wang, Xiang-Gao10, 11; Tang, Qing-Wen8, 9; Liang YunFeng(梁云峰)12; Zhang, Bin-Bin13; Wang, Yu14, 15, 16; Geng, Jin-Jun8, 9; Liang, En-Wei10; Wei, Jian-Yan17; Zhang, Bing11; Ryde, Felix1, 2
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015-05-20
卷号: 805, 期号:1, 页码:13
关键词: methods: statistical ; reference systems ; X-rays: ISM
学科分类: 天文和天体物理
DOI: 10.1088/0004-637X/805/1/13
文章类型: Article
英文摘要: We study an extensive sample of 87 gamma-ray bursts (GRBs) for which there are well-sampled and simultaneous optical and X-ray light curves. We extract the cleanest possible signal of the afterglow component. and compare the temporal behaviors of the X-ray light. curve, observed by Swift XRT, and optical data, observed by UVOT and ground-based telescopes for each individual burst. Overall we find that 62% of the GRBs. are consistent with the standard afterglow model. When more advanced modeling is invoked, up to 91% of the bursts in our sample may be consistent with the external-shock model. A large fraction of these bursts are consistent with occurring in a constant interstellar density medium (61%) while only 39% of them occur in a wind-like medium. Only nine cases have afterglow light curves that exactly match the standard fireball model prediction, having a single power-law decay in both energy bands that are observed during their entire duration. In particular, for the bursts with chromatic behavior, additional model assumptions must be made over limited segments of the light curves in order for these bursts to fully agree with the external-shock model. Interestingly, for 54% of the X-ray and 40% of the optical band observations, the end of the shallow decay (t(similar to-0.5)) period coincides with the jet-break (t(similar to-p)) time, causing an abrupt change in decay slope. The fraction of the burst that is consistent with the external-shock model is independent of the observational epochs in the rest frame of GRBs. Moreover, no cases can be explained by the cooling frequency crossing the X-ray or optical band.
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 ; CONTINUOUS ENERGY INJECTION ; BAND SPECTRAL EVOLUTION ; LIGHT-CURVE BREAKS ; BURST AFTERGLOWS ; EARLY-TIME ; COMPREHENSIVE ANALYSIS ; MILLISECOND PULSARS ; PROMPT EMISSION ; JET BREAK
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000354991300013
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14885
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.KTH Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden
2.Oskar Klein Ctr Cosmoparticle Phys, Stockholm, Sweden
3.Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden
4.Chinese Acad Sci, Chinese Ctr Antarctic Astron, Nanjing 210008, Jiangsu, Peoples R China
5.Purple Mt Observ, Joint Ctr Particle Nucl Phys, Nanjing 210008, Jiangsu, Peoples R China
6.Nanjing Univ, Nanjing 210008, Jiangsu, Peoples R China
7.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
8.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China
9.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
10.Guangxi Univ, Dept Phys, Ctr Astrophys & Space Sci, GXU NAOC, Nanjing 530004, Jiangsu, Peoples R China
11.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
12.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
13.Univ Alabama, CSPAR, Huntsville, AL 35899 USA
14.Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
15.Univ Roma La Sapienza, ICRA, I-00185 Rome, Italy
16.ICRANet, I-65122 Pescara, Italy
17.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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