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Transition from Fireball to Poynting-flux-dominated Outflow in Three-Episode GRB 160625Bстатья Электронная публикация
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 28 июня 2018 г.
- Авторы: 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., Żarnecki A.F., Cwiek A., Opiela R., Zadrożny 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-García M.D., Cunniffe R., Tello J.C., Ferrero P., Pandey S.B., Jelínek M., Peng F.K., Sánchez-Ramrez R., Castellón A.
- Журнал: Nature Astronomy
- Том: 2
- Год издания: 2018
- Первая страница: 69
- Последняя страница: 75
- DOI: 10.1038/s41550-017-0309-8
- Аннотация: The ejecta composition of gamma-ray bursts (GRBs) is an open question in GRB physics. Some GRBs possess a quasi-thermal spectral component in the time-resolved spectral analysis, suggesting a hot fireball origin. Some others show an essentially feature-less non-thermal spectrum known as the "Band" function, which can be interpreted as synchrotron radiation in an optically thin region, suggesting a Poynting-flux-dominated jet composition. Here we report an extraordinarily bright GRB 160625B, simultaneously observed in gamma-rays and optical wavelengths, whose prompt emission consists of three dramatically different isolated episodes separated by long quiescent intervals, with the durations of each "sub-burst" being $\sim$ 0.8 s, 35 s, and 212 s, respectively. The high brightness (with isotropic peak luminosity L$_{\rm p, iso}\sim 4\times 10^{53}$ erg/s) of this GRB allows us to conduct detailed time-resolved spectral analysis in each episode, from precursor to the main burst and extended emission. Interestingly, the spectral properties of the first two sub-bursts are distinctly different, which allow us for the first time to observe the transition from thermal to non-thermal radiation in 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.
- Добавил в систему: Прохоров Михаил Евгеньевич