The Self-Consistent keV to TeV Spectra of Gamma-Ray Bursts Produced by the Synchrotron-Self-Compton Emission in Relativistic Shocks

Details The Self-Consistent keV to TeV Spectra of Gamma-Ray Bursts Produced by the Synchrotron-Self-Compton Emission in Relativistic Shocks The Self-Consistent keV to TeV Spectra of Gamma-Ray Bursts Produced by the Synchrotron-Self-Compton Emission in Relativistic Shocks

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..662..292d&link_type=abstract

GAMMA-RAY BURST AND AFTERGLOW ASTRONOMY 2001: A Workshop Celebrating the First Year of the HETE Mission. AIP Conference Proceed

Astronomy and Astrophysics

Astronomy

4

Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

The spectra of Gamma-Ray Burst (GRB) emission have been investigated theoretically by a number of authors (e.g., [1, 2, 3]) for different versions of a general fireball-shock scenario [4, 5]. However, the existing models give rather coarse predictions and suffer from many uncertainties. Here we present a refined analytical model of synchrotron-self-Compton (SSC) emission. We take an arbitrary injection spectrum of relativistic particles and let them cool self-consistently, taking into account both synchrotron and inverse Compton (IC) losses and making corrections for the Klein-Nishina cut-off. When two-photon absorption is negligible, the problem is reduced to the single integral equation for the ratio of synchrotron to total losses as a function of particle's energy. The spectra of synchrotron and IC components, as well as the electron distribution, can be derived from this function in a regular way. The low-energy portion of the composite synchrotron spectrum in the fast cooling regime may have spectral index varying from 1/2 to 1, and the spectrum of the IC component is nearly flat around its maximum.

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