SIMULATIONS OF GAMMA-RAY BURSTS FROM EXTERNAL SHOCKS - TIME VARIABILITY AND SPECTRAL CORRELATIONS

Citation
A. Panaitescu et P. Meszaros, SIMULATIONS OF GAMMA-RAY BURSTS FROM EXTERNAL SHOCKS - TIME VARIABILITY AND SPECTRAL CORRELATIONS, The Astrophysical journal, 492(2), 1998, pp. 683-695
Citations number
36
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
0004637X
Volume
492
Issue
2
Year of publication
1998
Part
1
Pages
683 - 695
Database
ISI
SICI code
0004-637X(1998)492:2<683:SOGBFE>2.0.ZU;2-S
Abstract
We compute burst spectra and time structures arising from synchrotron and inverse Compton scattering by nonthermal electrons accelerated in shocks that form during the interaction between a thin ultrarelativist ic fireball and a stationary external medium. We investigate the effec t of varying the most important model parameters on the resulting burs t spectra, and we present a set of correlations among the spectral and temporal features of the bursts. The spectral hardness, various spect ral-temporal correlations, and the spectral evolution of the simulated bursts are compared to those of observed bursts for a representative set of model parameters. Multipulse structures are simulated using a v ariable magnetic held and anisotropic emission, and the most important spectral and temporal properties of these pulses are compared with ob servations.