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THE HISTORY OF GRB OUTFLOWS: EJECTION LORENTZ FACTOR AND RADIATION LOCATION OF X-RAY FLARES

文献类型：期刊论文

作者Mu, Hui-Jun1,2,6,7; Lin, Da-Bin1,2; Xi, Shao-Qiang1,3; Lin, Ting-Ting1,2; Wang, Yuan-Zhu1,2; Liang, Yun-Feng4; Lu, Lian-Zhong1,2; Zhang, Jin5; Liang, En-Wei1,2,5
刊名ASTROPHYSICAL JOURNAL
出版日期2016-11-01
卷号831期号:1页码:14
ISSN号0004-637X
关键词gamma-ray burst: general
DOI10.3847/0004-637X/831/1/111
通讯作者Lin, Da-Bin(lindabin@gxu.edu.cn)
英文摘要We present time-resolved spectral analysis of the steep decay segments of 29 bright X-ray flares of gamma-ray bursts (GRBs) observed with the Swift/X-ray telescope, and model their light curves and spectral index evolution behaviors with the curvature effect model. Our results show that the observed rapid flux decay and strong spectral index evolution with time can be well fitted with this model, and the derived characteristic timescales (t(c)) are in the range of 23 similar to 264 s. Using an empirical relation between the peak luminosity and the Lorentz factor derived from the prompt gamma-rays, we estimate the Lorentz factors of the flares (Gamma(X)). We obtain Gamma(X) = 17 similar to 87 with a median value of 52, which is smaller than the initial Lorentz factors of prompt gamma-ray fireballs. With the derived tc and Gamma(X), we constrain the radiating regions of 13 X-ray flares, yielding R-X = (0.2 similar to 1.1) x 10(16) cm, which are smaller than the radii of the afterglow fireballs at the peak times of the flares. A long evolution feature from prompt gamma-ray phase to the X-ray epoch is found by incorporating our results with a sample of GRBs whose initial Lorentz factors are available in the literature, i.e., Gamma proportional to[t(p) (1 + z)](-0.69 +/- 0.06). These results may shed light on the long-term evolution of GRB central engines.
WOS关键词BURST PROMPT EMISSION ; INTERNAL-SHOCK MODEL ; SWIFT XRT DATA ; COMPREHENSIVE ANALYSIS ; AFTERGLOW ONSET ; ENGINE ACTIVITY ; HOST GALAXIES ; 1ST SURVEY ; E-PEAK ; LONG
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000400472900002
源URL[http://libir.pmo.ac.cn/handle/332002/22841]  
专题中国科学院紫金山天文台
通讯作者Lin, Da-Bin
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, Peoples R China
3.Officers Coll CAPF, Dept Math & Phys, Chengdu 610213, Peoples R China
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
6.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
7.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China
推荐引用方式
GB/T 7714		 Mu, Hui-Jun,Lin, Da-Bin,Xi, Shao-Qiang,et al. THE HISTORY OF GRB OUTFLOWS: EJECTION LORENTZ FACTOR AND RADIATION LOCATION OF X-RAY FLARES[J]. ASTROPHYSICAL JOURNAL,2016,831(1):14.
APA Mu, Hui-Jun.,Lin, Da-Bin.,Xi, Shao-Qiang.,Lin, Ting-Ting.,Wang, Yuan-Zhu.,...&Liang, En-Wei.(2016).THE HISTORY OF GRB OUTFLOWS: EJECTION LORENTZ FACTOR AND RADIATION LOCATION OF X-RAY FLARES.ASTROPHYSICAL JOURNAL,831(1),14.
MLA Mu, Hui-Jun,et al."THE HISTORY OF GRB OUTFLOWS: EJECTION LORENTZ FACTOR AND RADIATION LOCATION OF X-RAY FLARES".ASTROPHYSICAL JOURNAL 831.1(2016):14.

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