MAGNETICALLY AND BARYONICALLY DOMINATED PHOTOSPHERIC GAMMA-RAY BURST MODEL FITS TO FERMI-LAT OBSERVATIONS

被引：14
|
作者：
Veres, Peter [1 ,2 ]
Zhang, Bin-Bin
Meszaros, Peter [1 ,2 ]
机构：
[1] Penn State Univ, Dept Astron & Astrophys, Dept Phys, University Pk, PA 16802 USA
[2] Penn State Univ, Ctr Particle & Gravitat Astrophys, University Pk, PA 16802 USA
来源：
ASTROPHYSICAL JOURNAL | 2013年 / 764卷 / 01期
关键词：
gamma-ray burst: general; HIGH-ENERGY EMISSION; SPECTRAL COMPONENT; NONTHERMAL EMISSION; PROMPT EMISSION; GRB; TELESCOPE; FIREBALL;
D O I：
10.1088/0004-637X/764/1/94
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We consider gamma-ray burst models where the radiation is dominated by a photospheric region providing the MeV Band spectrum, and an external shock region responsible for the GeV radiation via inverse Compton scattering. We parameterize the initial dynamics through an acceleration law Gamma proportional to r(mu), with mu between 1/3 and 1 to represent the range between an extreme magnetically dominated and a baryonically dominated regime, depending also on the magnetic field configuration. We compare these models to several bright Fermi-LAT bursts, and show that both the time-integrated and the time-resolved spectra, where available, can be well described by these models. We discuss the parameters which result from these fits, and discuss the relative merits and shortcomings of the two models.
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页数：11
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