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

Type Journal Article
Names Brian J. Morsony, Jared C. Workman, Davide Lazzati, Mikhail V. Medvedev
Publication Monthly Notices of the Royal Astronomical Society
Volume 392
Issue 4
Pages 1397-1402
Date February 1, 2009
URL http://adsabs.harvard.edu/abs/2009MNRAS.392.1397M
Library Catalog NASA ADS
Abstract 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 ν1/3. 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 behaviour of several recent observations, such as flat X-ray slopes and uncorrelated optical and X-ray behaviour.
Tags GAMMA RAYS: BURSTS, Magnetic Fields, radiation mechanisms: non-thermal
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