A REVERSE SHOCK IN GRB 181201A

Laskar, T.; van Eerten, H.; Patricia, S.; Mundell, C.G.; Alexander, K.D.; Rodolfo, B.D.; Edo, B.; Bolmer, J.; Ryan, C.; Deanne, C.; Wen-fai, F.; Andreja, G.; Nuria, J.; Shiho, K.; Raffaella, M.; Menten, K.M.; Re'em, S.; Ryo, Y.; Lipunov, V.M.; Gorbovskoy, E.; Kornilov, V.G.; Tyurina, N.; Zimnukhov, D.; Podesta, R.; Levato, H.; Buckley, D.A.; Tlatov, A.; Rebolo, R.; Serra-Ricart, M.

Авторы: Tanmoy Laskar, van Eerten Hendrik, Patricia Schady, Mundell C.G., Alexander Kate D., Rodolfo Barniol Duran, Edo Berger, Bolmer J., Ryan Chornock, Deanne Coppejans, Wen-fai Fong, Andreja Gomboc, Nuria Jordana, Shiho Kobayashi, Raffaella Margutti, Menten Karl M., Re'em Sari, Ryo Yamazaki, Lipunov V.M., Gorbovskoy E., Kornilov V.G., Tyurina N., Zimnukhov D., Podesta R., Levato H., Buckley D.A.H, Tlatov A., Rebolo R., Serra-Ricart M.
Журнал: Astrophysical Journal
Том: 884
Год издания: 2019
Издательство: University of Chicago Press
Местоположение издательства: United States
Первая страница: 121
Аннотация: https://iopscience.iop.org/article/10.3847/1538-4357/ab40ceWe present comprehensive multiwavelength radio to X-ray observations of GRB 181201A spanning from ≈150 s to ≈163 days after the burst, comprising the first joint ALMA-VLA-GMRT observations of a gamma-ray burst (GRB) afterglow. The radio and mm-band data reveal a distinct signature at ≈3.9 days, which we interpret as reverse shock (RS) emission. Our observations present the first time that a single radio-frequency spectral energy distribution can be decomposed directly into RS and forward shock (FS) components. We perform detailed modeling of the full multiwavelength data set, using Markov Chain Monte Carlo sampling to construct the joint posterior density function of the underlying physical parameters describing the RS and FS synchrotron emission. We uncover and account for all degeneracies in the model parameters. The joint RS-FS modeling reveals a weakly magnetized (σ≈3×10−3), mildly relativistic RS, from which we derive an initial bulk Lorentz factor of Γ0≈103 for the GRB jet. Our results support the hypothesis that low-density environments are conducive to the observability of RS emission. We compare our observations to other events with strong RS detections, and find a likely observational bias selecting for longer lasting, non-relativistic reverse shocks. We present and begin to address new challenges in modeling posed by the present generation of comprehensive, multi-frequency data sets.
Добавил в систему: Липунов Владимир Михайлович

	ИСТИНА	Войти в систему Регистрация
	Интеллектуальная Система Тематического Исследования НАукометрических данных
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

Интеллектуальная Система Тематического Исследования НАукометрических данных

A REVERSE SHOCK IN GRB 181201Aстатья

Прикрепленные файлы