MODELING SPECTRAL VARIABILITY OF PROMPT GAMMA-RAY BURST EMISSION WITHIN THE JITTER RADIATION PARADIGM / Medvedev Mikhail V.,Pothapragada Sriharsha S.,Reynolds Sarah J. // ASTROPHYSICAL JOURNAL LETTERS. - 2009. - V. 702, l. 1. - P. L91-L95.

ISSN/EISSN:

нет данных / нет данных

Type:

Article

Abstract:

The origin of rapid spectral variability and certain spectral correlations of prompt gamma-ray burst emission remains an intriguing question. The recently proposed theoretical model of the prompt emission is built upon unique spectral properties of jitter radiation-the radiation from small-scale magnetic fields generated at a site of strong energy release (e. g., a relativistic collisionless shock in baryonic or pair-dominated ejecta, or a reconnection site in a magnetically dominated outflow). Here we present the results of implementation of the model. We show that anisotropy of the jitter radiation pattern and relativistic shell kinematics altogether produce effects commonly observed in time-resolved spectra of the prompt emission, e. g., the softening of the spectrum below the peak energy within individual pulses in the prompt light curve, the so-called ``tracking{''} behavior (correlation of the observed flux with other spectral parameters), the emergence of hard, synchrotron-violating spectra at the beginning of individual spikes. Several observational predictions of the model are discussed.

Author keywords:

gamma rays: bursts; magnetic fields; radiation mechanisms: non-thermal; shock waves RELATIVISTIC COLLISIONLESS SHOCKS; MAGNETIC-FIELD GENERATION; PARTICLE-ACCELERATION; EVOLUTION; BATSE; CATALOG; PLASMAS

DOI:

10.1088/0004-637X/702/1/L91

Web of Science ID:

ISI:000269053200020

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	SEP 1
Publisher	IOP PUBLISHING LTD
Address	DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
Language	English
Keywords-Plus	RELATIVISTIC COLLISIONLESS SHOCKS; MAGNETIC-FIELD GENERATION; PARTICLE-ACCELERATION; EVOLUTION; BATSE; CATALOG; PLASMAS
Research-Areas	Astronomy \& Astrophysics
Web-of-Science-Categories	Astronomy \& Astrophysics
Funding-Acknowledgement	NSF {[}AST-0708213]; NASA {[}NNX-08AL39G, NNX-07AJ50G]; DOE {[}DE-FG02-07ER54940]
Funding-Text	We thank S. K. Graham for valuable help with computational issues and for discussions and the referee for numerous valuable and insightful suggestions. This work has been supported by NSF grant AST-0708213, NASA ATFP grant NNX-08AL39G, Swift Guest Investigator grant NNX-07AJ50G, and DOE grant DE-FG02-07ER54940.
Number-of-Cited-References	34
Usage-Count-Since-2013	1
Journal-ISO	Astrophys. J. Lett.
Doc-Delivery-Number	484NR