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Multicolor Blackbody Emission in GRB 081221
Hou, Shu-Jin1,2,3,4,5; Zhang, Bin-Bin6,7; Meng, Yan-Zhi2; Wu, Xue-Feng2; Liang, En-Wei3,4; Lu, Hou-Jun3,4; Liu, Tong8; Liang, Yun-Feng2; Lin, Lin9; Lu, Rui-Jing3,4; Huang, Jin-Shu1,5; Zhang, Bing10
2018-10-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume866Issue:1Pages:8
Corresponding AuthorZhang, Bin-Bin(bbzhang@nju.edu.cn)
AbstractThe 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.
Keywordgamma-ray burst: individual (GRB 081221) radiation mechanisms: thermal
DOI10.3847/1538-4357/aadc07
WOS KeywordGAMMA-RAY-BURSTS ; PHOTOSPHERIC EMISSION ; THERMAL EMISSION ; SHOCK MODEL ; FERMI ; SPECTRA ; INTENSITY ; EVOLUTION ; COMPONENT ; HARDNESS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000446752400013
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21154
Collection中国科学院紫金山天文台
Corresponding AuthorZhang, Bin-Bin
Affiliation1.Nanyang Normal Univ, Coll Phys & Elect Engn, Nanyang 473061, Henan, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China
4.Guangxi Univ, GXU NAOC Ctr Astrophys & Space Sci, Nanning 530004, Peoples R China
5.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China
6.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
7.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing, Jiangsu, Peoples R China
8.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
9.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
10.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
Recommended Citation
GB/T 7714
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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