Models of GRB shocks: physics predictions, observational tests / Medvedev Mikhail V. // . - 2008. - V. 1000, l. . - P. 369-372.

ISSN/EISSN:

0094-243X / нет данных

Type:

Proceedings Paper

Abstract:

Radiation from GRBs, either in the prompt phase or seen as flares or an afterglow, is believed to be produced at shocks by accelerated electrons in magnetic fields. However, there are alternatives, at least for the prompt and flares, namely the magnetically dominated and Poynting flux driven outflows, where no shocks presumably form at all. The outflow properties are intimately linked to the central engine/progenitor; hence, to understand the nature of the outflow is of great importance. Here we review the present status of the ``standard model of GRBs{''} - the model with internal/external shocks. We briefly discuss two alternative models of the magnetic field generation at shocks: the model based on the Weibel instability and the recently proposed one based on the generation of vorticity at a shock. We also address the electron energization/acceleration mechanisms (including non-Fermi) in both models. The observational predictions for the spectral and temporal dynamics of the produced radiation have been elaborated as well; these include: (i) the Jitter radiation mid spectral variability in the Weibel model and (ii) the time-evolving magnetic equipartition parameter in the vorticity model. The predictions appear to be quite different and this provides certain hope that they can allow to differentiate between the models.

Author keywords:

gamma-my bursts; shocks; magnetic fields; particle acceleration; radiation MAGNETIC-FIELD GENERATION; RAY BURST SHOCKS; PARTICLE-ACCELERATION; COLLISIONLESS SHOCKS; JITTER RADIATION; PROMPT EMISSION; AFTERGLOWS

DOI:

нет данных

Web of Science ID:

ISI:000256301400084

Соавторы в МНС:

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Другие поля

Поле	Значение
Editor	Galassi, M and Palmer, D and Fenimore, E
Booktitle	GAMMA-RAY BURSTS 2007
Series	AIP CONFERENCE PROCEEDINGS
Note	Santa Fe Conference on Gamma-Ray Bursts, Santa Fe, NM, NOV 05-09, 2007
Organization	Los Alamos Natl Lab; NASA Goddard Space Flight Ctr; Univ Space Res Assoc
Publisher	AMER INST PHYSICS
Address	2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
Language	English
ISBN	978-0-7354-0533-2
Keywords-Plus	MAGNETIC-FIELD GENERATION; RAY BURST SHOCKS; PARTICLE-ACCELERATION; COLLISIONLESS SHOCKS; JITTER RADIATION; PROMPT EMISSION; AFTERGLOWS
Research-Areas	Astronomy \& Astrophysics; Instruments \& Instrumentation
Web-of-Science-Categories	Astronomy \& Astrophysics; Instruments \& Instrumentation
Number-of-Cited-References	19
Doc-Delivery-Number	BHT72