Medvedev 2009 jitter emission

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可以解释同步的"死线"

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Title:		Modeling Spectral Variability of Prompt GRB Emission within the Jitter Radiation Paradigm
Authors:		Medvedev, Mikhail V.; Pothapragada, Sriharsha S.; Reynolds, Sarah J.
Publication:		eprint arXiv:0902.4244
Publication Date:		02/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		4 pages. Submitted to ApJL
Bibliographic Code:		2009arXiv0902.4244M

Abstract

The origin of rapid spectral variability and certain spectral correlations of the prompt gamma-ray burst emission remains an intriguing question. The recently proposed theoretical model of the prompt emission is build upon unique spectral properties of jitter radiation -- the radiation from small-scale magnetic fields generated at a relativistic collisionless shock. Here we present the results of numerical implementation of the model. We show that anisotropy of the jitter radiation pattern and relativistic shock kinematics altogether produce effects commonly observed in time-resolved spectra of 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.

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