PHOTON-SPLITTING LIMITS TO THE HARDNESS OF EMISSION IN STRONGLY MAGNETIZED SOFT GAMMA-REPEATERS

被引：27
作者：
BARING, MG
机构：
[1] NASA/Goddard Space Flight Center, Code 665, Greenbelt
来源：
ASTROPHYSICAL JOURNAL | 1995年 / 440卷 / 02期
关键词：
GAMMA RAYS; BURSTS; THEORY; MAGNETIC FIELDS; POLARIZATION; RADIATION MECHANISMS; NONTHERMAL; STARS; NEUTRON;
D O I：
10.1086/187763
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Soft gamma repeaters are characterized by recurrent activity consisting of short-duration outbursts of high-energy emission that is typically of temperature less than 40 keV. One recent model of repeaters is that they originate in the environs of neutron stars with superstrong magnetic fields, perhaps greater than 10(14) G. In such fields, the exotic process of magnetic photon splitting gamma --> gamma gamma acts very effectively to reprocess gamma-ray radiation down to hard X-ray energies. In this Letter, the action of photon splitting is considered in some detail, via the solution of photon kinetic equations, determining how it limits the hardness of emission in strongly magnetized repeaters, and thereby obtaining observational constraints to the field in SGR 1806-20.
引用
收藏
页码：L69 / L72
页数：4
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