The afterglow emission from a stratified jet in GRB 170817A
文献类型:期刊论文
作者 | Cheng KF(程康法)1,2; Zhao XH(赵晓红)1,3,4; Zhang, Bin-Bin5,6,7; Bai JM(白金明)1,3,4 |
刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS |
出版日期 | 2021-08 |
卷号 | 21期号:7 |
ISSN号 | 1674-4527 |
关键词 | gamma-ray burst general stars jets relativistic processes |
DOI | 10.1088/1674-4527/21/7/177 |
产权排序 | 第1完成单位 |
文献子类 | Article |
英文摘要 | The afterglow of GRB 170817A has been detected for more than three years, but the origin of the multi-band afterglow light curves remains under debate. A classical top-hat jet model is faced with difficulties in producing a shallow rise of the afterglow light curves as observed (F-nu proportional to T (0.8)). Here we reconsider the model of stratified ejecta with an energy profile of E(>Gamma beta) = E (0)(Gamma beta)(-k ) as the origin of the afterglow light curves of the burst, where Gamma and beta are the Lorentz factor and speed of the ejecta, respectively. k is the power-law slope of the energy profile. We consider that the ejecta are collimated into jets. Two kinds of jet evolutions are investigated, including a lateral-spreading jet and a non-lateral-spreading jet. We fit the multi-band afterglow light curves, including the X-ray data at one thousand days post-burst, and find that both the models of the spreading and non-spreading jets can fit the light curves well, but the observed angular size of the source and the apparent velocity of the flux centroid for the spreading jet model are beyond the observation limits, while the non-spreading jet model meets the observation limits. Some of the best-fit parameters for the non-spreading jet model, such as the number density of the circumburst medium similar to 10(-2) cm(-3) and the total jet kinetic energy E similar to 4.8 x 10(51) erg, also appear plausible. The best-fit slope of the jet energy profile is k similar to 7.1. Our results suggest that the afterglow of GRB 170817A may arise from the stratified jet and that the lateral spreading of the jet is not significant. |
学科主题 | 天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学 |
URL标识 | 查看原文 |
出版地 | 20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA |
WOS关键词 | X-RAY-EMISSION ; LIGHT CURVES ; NONTHERMAL EMISSION ; GW170817 ; CONSTRAINTS ; EJECTA ; COUNTERPART ; DYNAMICS ; OUTFLOW ; SPECTRA |
资助项目 | National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[11833003] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[U2038105] ; Yunnan Natural Science FoundationNatural Science Foundation of Yunnan Province[2014FB188] ; National Key Research and Development Programs of China[2018YFA0404204] ; Program for Innovative Talents, Entrepreneur in Jiangsu |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES |
WOS记录号 | WOS:000691274600001 |
资助机构 | National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[11833003, U2038105] ; Yunnan Natural Science FoundationNatural Science Foundation of Yunnan Province[2014FB188] ; National Key Research and Development Programs of China[2018YFA0404204] ; Program for Innovative Talents, Entrepreneur in Jiangsu |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/24554] |
专题 | 星系类星体研究组 云南天文台_丽江天文观测站(南方基地) 云南天文台_中国科学院天体结构与演化重点实验室 |
通讯作者 | Zhao XH(赵晓红) |
作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China; 2.University of the Chinese Academy of Sciences, Beijing 100049, China; 3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100101, China; 4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China; 5.School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China; 6.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210046, China; 7.Department of Physics and Astronomy, University of Nevada Las Vegas, NV 89154, USA |
推荐引用方式 GB/T 7714 | Cheng KF,Zhao XH,Zhang, Bin-Bin,et al. The afterglow emission from a stratified jet in GRB 170817A[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2021,21(7). |
APA | Cheng KF,Zhao XH,Zhang, Bin-Bin,&Bai JM.(2021).The afterglow emission from a stratified jet in GRB 170817A.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,21(7). |
MLA | Cheng KF,et al."The afterglow emission from a stratified jet in GRB 170817A".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 21.7(2021). |
入库方式: OAI收割
来源:云南天文台
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