Brian 2008 Jetter Riadiation辐射机制

主要内容:
jitter可以产生低频端的nu^0,而同步之能产生1/3

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文章信息:

 arXiv:0809.0333 [ps, pdf, other]

Jitter radiation images, spectra, and light curves from a relativistic spherical blastwave

Brian J. Morsony (JILA), Jared C. Workman (JILA), Davide Lazzati (JILA), Mikhail V. Medvedev (U. Kansas and Kurchatov Institute)

Comments: 11 pages, 7 postscript figures. Accepted for publication in MNRAS

Subjects: Astrophysics (astro-ph)

We consider radiation emitted by the jitter mechanism in a Blandford-McKee self-similar blastwave. We assume the magnetic field configuration throughout the whole blastwave meets the condition for the emission of jitter radiation and we compute the ensuing images, light curves and spectra. The calculations are performed for both a uniform and a wind environment. We compare our jitter results to synchrotron results. We show that jitter radiation produces slightly different spectra than synchrotron, in particular between the self-absorption and the peak frequency, where the jitter spectrum is flat, while the synchrotron spectrum grows as \nu^{1/3}. The spectral difference is reflected in the early decay slope of the light curves. We conclude that jitter and synchrotron afterglows can be distinguished from each other with good quality observations. However, it is unlikely that the difference can explain the peculiar behavior of several recent observations, such as flat X-ray slopes and uncorrelated optical and X-ray behavior.