Reynolds 2009 Jitter Radiation的谱

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Title:		Angular Dependence of Jitter Radiation Spectra from Small-Scale Magnetic Turbulence
Authors:		Reynolds, Sarah; Pothapragada, Sriharsha; Medvedev, Mikhail V.
Publication:		eprint arXiv:0902.2369
Publication Date:		02/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		65 pages, 42 figures, submitted to ApJ
Bibliographic Code:		2009arXiv0902.2369R

Abstract

Jitter radiation is produced by relativistic electrons moving in turbulent small-scale magnetic fields such as those produced by streaming Weibel-type instabilities at collisionless shocks in weakly magnetized media. Here we present a comprehensive study of the dependence of the jitter radiation spectra on the properties of, in general, anisotropic magnetic turbulence. We obtained that the radiation spectra do reflect, to some extent, properties of the magnetic field spatial distribution, yet radiation field is anisotropic and sensitive to the viewing direction with respect to the field anisotropy direction. We explore the parameter space of the magnetic field distribution and its effect on the radiation spectra. Some important results include: the presence of the harder-than-synchrotron segment below the peak frequency at some viewing angles, the presence of the high-frequency power-law tail even for a monoenergetic distribution of electrons, the dependence of the peak frequency on the field correlation length rather than the field strength, the strong correlation of the spectral parameters with the viewing angle. We consider these results to be important for accurate interpretation of prompt gamma-ray burst spectra and possibly other sources.

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