Collisional mechanism for gamma-ray burst emission

被引：299
作者：
Beloborodov, Andrei M. [1 ,2 ,3 ]
机构：
[1] Columbia Univ, Dept Phys, New York, NY 10027 USA
[2] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA
[3] PN Lebedev Phys Inst, Astrospace Ctr, Moscow 117810, Russia
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2010年 / 407卷 / 02期
关键词：
plasmas; radiation mechanisms: non-thermal; radiation mechanisms: thermal; radiative transfer; scattering; gamma-rays: bursts; theory; relativity; PHOTOSPHERIC EMISSION; FERMI OBSERVATIONS; DELAYED EMISSION; PAIR PRODUCTION; GEV NEUTRINOS; GRB; 080916C; FIREBALLS; ACCELERATION; EFFICIENCY; MODEL;
D O I：
10.1111/j.1365-2966.2010.16770.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Nuclear and Coulomb collisions in gamma-ray burst (GRB) jets create a hot e +/- plasma. This collisional heating starts when the jet is still opaque, and extends to the transparent region. The e +/- plasma radiates its energy. As a result, a large fraction of the jet energy is converted to escaping radiation with a well-defined spectrum. The process is simulated in detail using the known rates of collisions and accurate calculations of radiative transfer in the expanding jet. The result reproduces the spectra of observed GRBs that typically peak near 1 MeV and extend to much higher energies with a photon index beta similar to -2.5. This suggests that collisional heating may be the main mechanism for GRB emission.
引用
收藏
页码：1033 / 1047
页数：15
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