Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009acasn..50..134m&link_type=abstract
Acta Astronomica Sinica, vol. 50, no. 2, p. 134-140
Astronomy and Astrophysics
Astronomy
Radiation Mechanisms: Non-Thermal, Gamma Rays: Bursts, Gamma Rays: Theory
Scientific paper
It is believed commonly that the synchrotron emission of electrons within the shocked region is the leading radiation mechanism for GRB prompt emission. However, the theoretical prediction has not been conformed to observed results well. We confirm that the electrons within the shocked regions fast cool due to radiation losses on a time scale much shorter than the dynamical time of the system. It is also indicated that the synchrotron spectrum of fast cooling electrons obtained in the past is a rough results. We show the precise synchrotron spectrum of fast cooling electrons by numerical calculating and thereby explain the observed distribution of GRB low-energy spectrum index α reasonably. In addition, we fit the correlation between α and peak energy Ep of spectrum.
Mao Zhongquan
Yang P.-B.
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