Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..556..284w&link_type=abstract
EXPLOSIVE PHENOMENA IN ASTROPHYSICAL COMPACT OBJECTS: First KIAS Astrophysics Workshop. AIP Conference Proceedings, Volume 556,
Astronomy and Astrophysics
Astrophysics
Gamma-Ray Sources, Gamma-Ray Bursts, Radiation Mechanisms, Polarization
Scientific paper
Here we talk about the effects of inverse Compton scattering (ICS) and jet on GRB afterglows. In the simplest fireball model, synchrotron radiation is believed to be the main mechanism of GRB emission, however, here we will show that under some circumstances, the inverse Compton scattering may play an important role, and can change the light curves of GRB afterglows. Beaming of relativistic ejecta in GRBs has been postulated by many authors in order to reduce the total GRB energy, thus it is very important to look for the observational evidence of beaming. Here we analyze the dynamical evolution of the jet blast wave, calculate the jet emission analytically, we find that the sharp break predicted by Rhoads will actually not exist, and for most cases the afterglow light curve will almost not be affected by sideways expansion unless the beaming angle is extremely small. We demonstrate that only when θ0<0.1, the afterglow light curves may be steepened by sideways expansion, and in fact there cannot be two breaks as claimed before. .
Lu Tan
Wei Da-Ming
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