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THE HISTORY OF GRB OUTFLOWS: EJECTION LORENTZ FACTOR AND RADIATION LOCATION OF X-RAY FLARES
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
2016-11-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume831Issue:1Pages:14
Corresponding AuthorLin, Da-Bin(lindabin@gxu.edu.cn)
AbstractWe 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.
Keywordgamma-ray burst: general
DOI10.3847/0004-637X/831/1/111
WOS KeywordBURST PROMPT EMISSION ; INTERNAL-SHOCK MODEL ; SWIFT XRT DATA ; COMPREHENSIVE ANALYSIS ; AFTERGLOW ONSET ; ENGINE ACTIVITY ; HOST GALAXIES ; 1ST SURVEY ; E-PEAK ; LONG
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000400472900002
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22842
Collection中国科学院紫金山天文台
Corresponding AuthorLin, Da-Bin
Affiliation1.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
Recommended Citation
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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