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题名: Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B
作者: Zhang, B. -B.; Zhang, B.; Castro-Tirado, A. J.; Dai, Z. G.; Tam, P. -H. T.; Wang, X. -Y.; Hu, Y. -D.; Karpov, S.; Pozanenko, A.; Zhang, F. -W.; Mazaeva, E.; Minaev, P.; Volnova, A.; Oates, S.; Gao, H.; Wu, X. -F; Shao, L.; Tang, Q. -W.; Beskin, G.; Biryukov, A.; Bondar, S.; Ivanov, E.; Katkova, E.; Orekhova, N.; Perkov, A.; Sasyuk, V.; Mankiewicz, L.; Zarnecki, A. F.; Cwiek, A.; Opiela, R.; Zadrozny, A.; Aptekar, R.; Frederiks, D.; Svinkin, D.; Kusakin, A.; Inasaridze, R.; Burhonov, O.; Rumyantsev, V.; Klunko, E.; Moskvitin, A.; Fatkhullin, T.; Sokolov, V. V.; Valeev, A. F.; Jeong, S.; Park, I. H.; Caballero-Garcia, M. D.; Cunniffe, R.; Tello, J. C.; Ferrero, P.; Pandey, S. B.; Jelinek, M.; Peng, F. K.; Sanchez-Ramrez, R.; Castellon, A.
刊名: NATURE ASTRONOMY
出版日期: 2018
卷号: 2, 期号:1, 页码:69-75
英文摘要: The ejecta composition is an open question in gamma-ray burst (GRB) physics(1). Some GRBs possess a quasi-thermal spectral component in the time-resolved spectral analysis(2), suggesting a hot fireball origin. Others show a featureless non-thermal spectrum known as the Band function(3-5), consistent with a synchrotron radiation origin(5,6) and suggesting that the jet is Poynting-flux dominated at the central engine and probably in the emission region as well(7,8). There are also bursts showing a sub-dominant thermal component and a dominant synchrotron component(9), suggesting a probable hybrid jet composition(10). Here, we report an extraordinarily bright GRB 160625B, simultaneously observed in gamma-ray and optical wavelengths, whose prompt emission consists of three isolated episodes separated by long quiescent intervals, with the durations of each sub-burst being approximately 0.8 s, 35 s and 212 s, respectively. Its high brightness (with isotropic peak luminosity L-p,L-iso approximate to 4 x 10(53) erg s(-1)) allows us to conduct detailed time-resolved spectral analysis in each episode, from precursor to main burst and to extended emission. The spectral properties of the first two sub-bursts are distinctly different, allowing us to observe the transition from thermal to non-thermal radiation between well-separated emission episodes within a single GRB. Such a transition is a clear indication of the change of jet composition from a fireball to a Poynting-flux-dominated jet.
语种: 英语
WOS记录号: WOS:000423480900023
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17987
Appears in Collections:暗物质和空间天文实验室_期刊论文

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