e± pair cascades and precursors in gamma-ray bursts

被引:56
作者
Mészáros, P
Ramirez-Ruiz, E
Rees, MJ
机构
[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[2] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16803 USA
[3] Univ Calif Santa Barbara, Inst Theoret Phys, Santa Barbara, CA 93106 USA
关键词
cosmology : miscellaneous; gamma rays : bursts; X-rays : bursts;
D O I
10.1086/321404
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Gamma-ray burst sources with a high luminosity can produce electron-positron pair cascades in their environment as a result of backscattering of a seed fraction of their original hard spectrum. The resulting spectral modifications offer the possibility of diagnosing not only the compactness parameter of the gamma-ray-emitting region but also the baryonic density of the environment external to the burst.
引用
收藏
页码:660 / 666
页数:7
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