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; Peng, FK (reprint author), Guangxi Univ, Dept Phys, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
发表期刊ASTROPHYSICAL JOURNAL
2014-11-10
卷号795期号:2
DOI10.1088/0004-637X/795/2/155
收录类别SCI
关键词Gamma-ray Burst: General Methods: Statistical Radiation Mechanisms: Non-thermal Radiation Mechanisms: Thermal
摘要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.
项目资助者National 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 "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000343857900054
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]INTERNAL SHOCK MODEL ; E-P EVOLUTION ; 1ST 2 YEARS ; PROMPT EMISSION ; COMPREHENSIVE ANALYSIS ; LUMINOSITY RELATION ; LORENTZ-FACTOR ; PEAK ENERGY ; NONTHERMAL EMISSION ; THERMAL EMISSION
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被引频次:18[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9377
专题中国科学院天体结构与演化重点实验室
通讯作者Peng, FK (reprint author), Guangxi Univ, Dept Phys, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
作者单位1.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
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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.,...&Peng, FK .(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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