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题名: PHOTOSPHERE EMISSION IN THE X-RAY FLARES OF SWIFT GAMMA-RAY BURSTS AND IMPLICATIONS FOR THE FIREBALL PROPERTIES
作者: 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
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2014-11-10
卷号: 795, 期号:2, 页码:155
关键词: gamma-ray burst: general ; methods: statistical ; radiation mechanisms: non-thermal ; radiation mechanisms: thermal
学科分类: 天文和天体物理
DOI: 10.1088/0004-637X/795/2/155
文章类型: Article
英文摘要: 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: 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
收录类别: SCI
语种: 英语
WOS记录号: WOS:000343857900054
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/11565
Appears in Collections:卫星精密定轨及应用研究团组_期刊论文

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作者单位: 1.Guangxi Univ, Dept Phys, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
2.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
3.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kuming 650011, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
5.Nanyang Normal Coll, Inst Phys & Elect Engn, Nanyang 473061, Peoples R China
6.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
7.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA

Recommended Citation:
Peng, Fang-Kun; Liang, En-Wei; Wang, Xiang-Yu; Hou, Shu-Jin; Xi, Shao-Qiang; Lu, Rui-Jing; Zhang, Jin; Zhang, Bing.PHOTOSPHERE EMISSION IN THE X-RAY FLARES OF SWIFT GAMMA-RAY BURSTS AND IMPLICATIONS FOR THE FIREBALL PROPERTIES,ASTROPHYSICAL JOURNAL,2014,795(2):155
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文件名: 201402009PHOTOSPHERE EMISSION IN THE X-RAY FLARES OF SWIFT GAMMA-RAY BURSTS AND IMPLICATIONS FOR THE FIREBALL PROPERTIES.pdf
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