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Evaluating the Bulk Lorentz Factors of Outflow Material: Lessons Learned from the Extremely Energetic Outburst GRB 160625B
Wang, Yuan-Zhu1,2; Wang, Hao1,2; Zhang, Shuai1,2; Liang, Yun-Feng1,2; Jin, Zhi-Ping1; He, Hao-Ning1; Liao, Neng-Hui1; Fan, Yi-Zhong1; Wei, Da-Ming1
2017-02-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume836Issue:1Pages:8
Corresponding AuthorLiang, Yun-Feng(liangyf@pmo.ac.cnjin@pmo.ac.cn)
AbstractGRB 160625B is an extremely bright outburst with well-monitored afterglow emission. The geometry-corrected energy is high, up to similar to 5.2 x 10(52) erg or even similar to 8 x 10(52) erg, rendering it the most energetic GRB prompt emission recorded so far. We analyzed the time-resolved spectra of the prompt emission and found that in some intervals there were likely thermal-radiation components and the high energy emission was characterized by significant cutoff. The bulk Lorentz factors of the outflow material are estimated accordingly. We found out that the Lorentz factors derived in the thermal- radiation model are consistent with the luminosity-Lorentz factor correlation found in other bursts, as well as in GRB 090902B for the time-esolved thermal-radiation components, while the spectral cutoff model yields much lower Lorentz factors that are in tension with the constraints set by the electron pair Compton scattering process. We then suggest that these spectral cutoffs are more likely related to the particle acceleration process and that one should be careful in estimating the Lorentz factors if the spectrum cuts at a rather low energy (e.g., similar to tens of MeV). The nature of the central engine has also been discussed, and a stellarmass black hole is favored.
Keywordgamma-ray burst: individual (GRB 160625B) methods: data analysis radiation mechanisms: thermal
DOI10.3847/1538-4357/aa56c6
WOS KeywordGAMMA-RAY BURSTS ; EARLY OPTICAL AFTERGLOWS ; THERMAL EMISSION ; REVERSE SHOCK ; MODEL ; GRB-990123 ; FIREBALLS ; FLASH ; CONSTRAINTS ; PARAMETERS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000397304500033
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23190
Collection中国科学院紫金山天文台
Corresponding AuthorLiang, Yun-Feng
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China
2.Univ Chinese Acad Sci, Yuquan Rd 19, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Yuan-Zhu,Wang, Hao,Zhang, Shuai,et al. Evaluating the Bulk Lorentz Factors of Outflow Material: Lessons Learned from the Extremely Energetic Outburst GRB 160625B[J]. ASTROPHYSICAL JOURNAL,2017,836(1):8.
APA Wang, Yuan-Zhu.,Wang, Hao.,Zhang, Shuai.,Liang, Yun-Feng.,Jin, Zhi-Ping.,...&Wei, Da-Ming.(2017).Evaluating the Bulk Lorentz Factors of Outflow Material: Lessons Learned from the Extremely Energetic Outburst GRB 160625B.ASTROPHYSICAL JOURNAL,836(1),8.
MLA Wang, Yuan-Zhu,et al."Evaluating the Bulk Lorentz Factors of Outflow Material: Lessons Learned from the Extremely Energetic Outburst GRB 160625B".ASTROPHYSICAL JOURNAL 836.1(2017):8.
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