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PHOTOSPHERE EMISSION IN THE X-RAY FLARES OF SWIFT GAMMA-RAY BURSTS AND IMPLICATIONS FOR THE FIREBALL PROPERTIES
Peng, Fang-Kun1,2,3; Liang, En-Wei1,3,4; Wang, Xiang-Yu2; Hou, Shu-Jin5,6; Xi, Shao-Qiang1; Lu, Rui-Jing1; Zhang, Jin4; Zhang, Bing1,7
Source PublicationASTROPHYSICAL JOURNAL
2014-11-10
Volume795Issue:2
DOI10.1088/0004-637X/795/2/155
Indexed BySCI
KeywordGamma-ray Burst: General Methods: Statistical Radiation Mechanisms: Non-thermal Radiation Mechanisms: Thermal
Abstract

X-ray flares of gamma-ray bursts (GRBs) are usually observed in the soft X-ray range and the spectral coverage is limited. In this paper, we present an analysis of 32 GRB X-ray flares that are simultaneously observed by both Burst Alert Telescope and X-Ray Telescope on board the Swift mission, so that a joint spectral analysis with a wider spectral coverage is possible. Our results show that the joint spectra of 19 flares are fitted with the absorbed single power law or the Band function models. More interestingly, the joint spectra of the other 13 X-ray flares are fitted with the absorbed single power-law model plus a blackbody component. Phenomenally, the observed spectra of these 13 flares are analogous to several GRBs with a thermal component, but only with a much lower temperature of kT = 1 similar to 3 keV. Assuming that the thermal emission is the photosphere emission of the GRB fireball, we derive the fireball properties of the 13 flares that have redshift measurements, such as the bulk Lorentz factor Gamma(ph) of the outflow. The derived Gamma(ph) range from 50 to 150 and a relation of Gamma(ph) to the thermal emission luminosity is found. It is consistent with the Gamma(0) - L-iso relations that are derived for the prompt gamma-ray emission. We discuss the physical implications of these results within the content of jet composition and the radiation mechanism of GRBs and X-ray flares.

Funding ProjectNational Basic Research Program (973 Programme) of China[2014CB845800] ; National Natural Science Foundation of China[11025313] ; National Natural Science Foundation of China[11163001] ; National Natural Science Foundation of China[11363002] ; Guangxi Science Foundation[2013GXNSFFA019001] ; Key Laboratory for the Structure and Evolution of Celestial Objects of the Chinese Academy of Sciences ; Strategic Priority Research Program
Funding OrganizationNational Basic Research Program (973 Programme) of China[2014CB845800] ; National Natural Science Foundation of China[11025313, 11163001, 11363002] ; Guangxi Science Foundation[2013GXNSFFA019001] ; Key Laboratory for the Structure and Evolution of Celestial Objects of the Chinese Academy of Sciences ; Strategic Priority Research Program
Language英语
Subject Area天文学 ; 天体物理学 ; 高能天体物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000343857900054
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordINTERNAL SHOCK MODEL ; E-P EVOLUTION ; 1ST 2 YEARS ; PROMPT EMISSION ; COMPREHENSIVE ANALYSIS ; LUMINOSITY RELATION ; LORENTZ-FACTOR ; PEAK ENERGY ; NONTHERMAL EMISSION ; THERMAL EMISSION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9377
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorPeng, Fang-Kun
Affiliation1.Guangxi Key Laboratory for Relativistic Astrophysics, the Department of Physics, Guangxi University, Nanning 530004, China
2.School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, CAS, Kuming 650011, China
4.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
5.Institute of Physics and Electronic Engineering, Nanyang Normal College, Nanyang 473061, China
6.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China
7.Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154, USA
Recommended Citation
GB/T 7714
Peng, Fang-Kun,Liang, En-Wei,Wang, Xiang-Yu,et al. PHOTOSPHERE EMISSION IN THE X-RAY FLARES OF SWIFT GAMMA-RAY BURSTS AND IMPLICATIONS FOR THE FIREBALL PROPERTIES[J]. ASTROPHYSICAL JOURNAL,2014,795(2).
APA Peng, Fang-Kun.,Liang, En-Wei.,Wang, Xiang-Yu.,Hou, Shu-Jin.,Xi, Shao-Qiang.,...&Zhang, Bing.(2014).PHOTOSPHERE EMISSION IN THE X-RAY FLARES OF SWIFT GAMMA-RAY BURSTS AND IMPLICATIONS FOR THE FIREBALL PROPERTIES.ASTROPHYSICAL JOURNAL,795(2).
MLA Peng, Fang-Kun,et al."PHOTOSPHERE EMISSION IN THE X-RAY FLARES OF SWIFT GAMMA-RAY BURSTS AND IMPLICATIONS FOR THE FIREBALL PROPERTIES".ASTROPHYSICAL JOURNAL 795.2(2014).
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