Multicolor Blackbody Emission in GRB 081221
文献类型:期刊论文
作者 | 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 |
刊名 | ASTROPHYSICAL JOURNAL |
出版日期 | 2018-10-10 |
卷号 | 866期号:1页码:8 |
ISSN号 | 0004-637X |
关键词 | gamma-ray burst: individual (GRB 081221) radiation mechanisms: thermal |
DOI | 10.3847/1538-4357/aadc07 |
英文摘要 | 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. |
WOS关键词 | GAMMA-RAY-BURSTS ; PHOTOSPHERIC EMISSION ; THERMAL EMISSION ; SHOCK MODEL ; FERMI ; SPECTRA ; INTENSITY ; EVOLUTION ; COMPONENT ; HARDNESS |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000446752400013 |
源URL | [http://libir.pmo.ac.cn/handle/332002/21153] |
专题 | 中国科学院紫金山天文台 |
通讯作者 | Zhang, Bin-Bin |
作者单位 | 1.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 |
推荐引用方式 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. |
入库方式: OAI收割
来源:紫金山天文台
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