A key to the spectral variability of prompt GRBs / Medvedev Mikhail V. // . - 2006. - V. 836, l. . - P. 169-172.

ISSN/EISSN:

0094-243X / нет данных

Type:

Proceedings Paper

Abstract:

We demonstrate that the rapid spectral variability of prompt GRBs is an inherent property of radiation emitted from shock-generated, highly anisotropic small-scale magnetic fields. We interpret the hard-to-soft evolution and the correlation of the soft index a with the photon flux observed in GRBs as a combined effect of temporal variation of the shock viewing angle and relativistic aberration of an individual thin, instantaneously illuminated shell. The model predicts that about a quarter of time-resolved spectra should have hard spectra, violating the synchrotron alpha = -2/3 limit. The model also naturally explains why the peak of the distribution of alpha is at alpha similar to 1. The presence of a low-energy break in the jitter spectrum at oblique angles also explains the appearance of a soft X-ray component in some GRBs and their paucity. We emphasize that our theory is based solely on the first principles and contains no ad hoc (phenomenological) assumptions.

Author keywords:

gamma rays : bursts; radiation processes; shock waves; magnetic fields GAMMA-RAY BURSTS; BATSE; EVOLUTION; SHOCKS

DOI:

нет данных

Web of Science ID:

ISI:000238125000032

Соавторы в МНС:

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Другие поля

Поле	Значение
Editor	Holt, SS and Gehrels, N and Nousek, JA
Booktitle	Gamma-Ray Bursts in the Swift Era
Series	AIP CONFERENCE PROCEEDINGS
Note	16th Annual Astrophysics Conference, Washington, DC, NOV 29-DEC 02, 2005
Organization	NASA, Goddard Space Flight Ctr; Univ Maryland; Gen Dynam
Publisher	AMER INST PHYSICS
Address	2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
Language	English
ISBN	0-7354-0326-0
Keywords-Plus	GAMMA-RAY BURSTS; BATSE; EVOLUTION; SHOCKS
Research-Areas	Astronomy \& Astrophysics; Physics
Web-of-Science-Categories	Astronomy \& Astrophysics; Physics, Multidisciplinary
Number-of-Cited-References	9
Doc-Delivery-Number	BEM37