Other
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1402m&link_type=abstract
American Astronomical Society, HEAD meeting #11, #14.02; Bulletin of the American Astronomical Society, Vol. 41, p.675
Other
Scientific paper
The origin of rapid spectral variability and certain spectral correlations of the prompt gamma-ray burst emission remains an intriguing question. We propose a heuristic model of the prompt emission, which involves 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). 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. We discuss observational predictions of the model and highlight ideas that may help to discriminate baryon/lepton-dominated and magnetically-dominated GRBs.
Medvedev Mikhail
Pothapragada Sriharsha S.
Reynolds Steve
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