Multicolor Blackbody Emission in GRB 081221
Hou, Shu-Jin1,2,3,4; Zhang, Bin-Bin5,6; Meng, Yan-Zhi2; Wu, Xue-Feng2; Liang, En-Wei3; Lu, Hou-Jun3; Liu, Tong7; Liang, Yun-Feng2; Lin, Lin8; Lu, Rui-Jing3; Huang, Jin-Shu1,4; Zhang, Bing9
通讯作者Zhang, Bin-Bin(bbzhang@nju.edu.cn)
发表期刊ASTROPHYSICAL JOURNAL
2018-10-10
卷号866期号:1页码:8
DOI10.3847/1538-4357/aadc07
收录类别SCI
关键词gamma-ray burst: individual (GRB 081221) radiation mechanisms: thermal
摘要The radiation mechanism of the prompt emission of gamma-ray bursts (GRBs) remains an open question. Although their spectra are usually well fitted with the empirical Band function, which is widely believed to be fully nonthermal and interpreted as an optically thin synchrotron emission, accumulating evidence shows that a thermal component actually exists. In this paper, a multicolor blackbody (mBB) model is proposed for the time-integrated spectrum of GRB 081221 by assuming a power-law distribution of the thermal luminosities with temperature, which manifests photospheric emissions from a different radius and/or angle. The effects of the minimum temperature kT(min), the maximum temperature kT(max), and the power-law index m of the luminosity distribution of an mBB are discussed. The fitting to the time-integrated spectrum during the bright phase (from 20 to 30 s since the trigger) of GRB 081221 by the mBB model yields kT(min) = 4.4 +/- 0.3 keV, kT(max) = 57.0(-1.4)(+1.6) keV, and m = -0.46(-0.06)(+0.05) When the time bin is small enough, the time-resolved spectra of GRB 081221 are well fitted with a series of single-temperature blackbodies. Our results imply the prompt emission of GRB 081221 is dominated by the photosphere emission and its time-integrated spectrum is a superposition of pure blackbody components at different times, indicating that some empirical Band spectra may be interpreted as mBB if the temperature is widely distributed.
资助项目National Basic Research Program (973 Program) of China[2014CB845800] ; National Natural Science Foundation of China[11725314] ; National Natural Science Foundation of China[11673068] ; National Natural Science Foundation of China[11473022] ; National Natural Science Foundation of China[11503011] ; National Natural Science Foundation of China[11275057] ; National Natural Science Foundation of China[11543004] ; National Natural Science Foundation of China[11233006] ; National Natural Science Foundation of China[11822304] ; National Natural Science Foundation of China[11603006] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201403] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201703] ; key scientific and technological project of Henan province[172102310334] ; Key Research Program of Frontier Sciences[QYZDB-SSW-SYS005] ; Strategic Priority Research Program multi-waveband gravitational wave Universe of the Chinese Academy of Sciences[XDB23000000] ; Fundamental Research Funds for the Central Universities, Nanyang Normal University Doctoral Fund[15064] ; Key Scientific Research Project in Universities of Henan Province[15A160001] ; National Thousand Young Talents program of China
项目资助者National Basic Research Program (973 Program) of China ; National Natural Science Foundation of China ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects ; key scientific and technological project of Henan province ; Key Research Program of Frontier Sciences ; Strategic Priority Research Program multi-waveband gravitational wave Universe of the Chinese Academy of Sciences ; Fundamental Research Funds for the Central Universities, Nanyang Normal University Doctoral Fund ; Key Scientific Research Project in Universities of Henan Province ; National Thousand Young Talents program of China
语种英语
学科领域天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
ISSN0004-637X
URL查看原文
WOS记录号WOS:000446752400013
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GAMMA-RAY-BURSTS ; PHOTOSPHERIC EMISSION ; THERMAL EMISSION ; SHOCK MODEL ; FERMI ; SPECTRA ; INTENSITY ; EVOLUTION ; COMPONENT ; HARDNESS
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/18020
专题中国科学院天体结构与演化重点实验室
通讯作者Zhang, Bin-Bin; Wu, Xue-Feng; Liang, En-Wei; Zhang, Bing
作者单位1.College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang, Henan 473061, People's Republic of China
2.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China
3.Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, People's Republic of China
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011; People's Republic of China
5.School of Astronomy and Space Science, Nanjing University, Nanjing 210093, People's Republic of China
6.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing, People's Republic of China
7.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
8.Department of Astronomy, Beijing Normal University, Beijing 100875, People's Republic of China
9.Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154, USA
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Hou, Shu-Jin,Zhang, Bin-Bin,Meng, Yan-Zhi,et al. Multicolor Blackbody Emission in GRB 081221[J]. ASTROPHYSICAL JOURNAL,2018,866(1):8.
APA Hou, Shu-Jin.,Zhang, Bin-Bin.,Meng, Yan-Zhi.,Wu, Xue-Feng.,Liang, En-Wei.,...&Zhang, Bing.(2018).Multicolor Blackbody Emission in GRB 081221.ASTROPHYSICAL JOURNAL,866(1),8.
MLA Hou, Shu-Jin,et al."Multicolor Blackbody Emission in GRB 081221".ASTROPHYSICAL JOURNAL 866.1(2018):8.
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