Hard X-ray spectra of anomalous X-ray pulsars

被引：0
|
作者：
Wang, W. [1 ]
机构：
[1] Max Planck Inst Extraterr Phys, D-85740 Garching, Germany
来源：
ASTROPHYSICS OF COMPACT OBJECTS | 2007年 / 968卷
关键词：
pulsars : individual; Gamma-rays : observations;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We search for the hard X-ray tails of anomalous X-ray pulsars (AXPs) from 15-200 keV with two years of INTEGRAL/SPI and SWIFT/BAT observations. Two AXPs (1E1841-045 and 4U0142+614) are detected with SPI. And four AXPs (1E1841-045, 4U0142+614, IRXS J1708-40 and 1E2259+586) are detected with SWIFT. Their hard X-ray spectra above 20 keV can be described by a power law with photon index of similar to 0.5 - 1.5. The possible turn-off energy for 1E1841-045 has been determined at around 120 keV. This non-thermal hard emission should have a different origin from the soft thermal emission of AXPs below 10 keV Modelling pulse profiles with the 3-D simulations of magnetosphere in magnetars compared with observed pulse profiles suggests that hard X-ray tails would originate in the close-field magnetosphere.
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页码：101 / 103
页数：3
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