Hard X-ray spectra of anomalous X-ray pulsars

摘要：

We search for the hard X-ray tails of anomalous X-ray pulsars (AXPs) from 15-200keV with two years of INTEGRAL/SPI and SWIFT/BAT observations. Two AXPs (1E1841-045 and 4U0142+614) are detected with SPI. And four AXPs (lE1841-045, 4U0142+614, 1RXS J1708-40 and lE2259+586) are detected with SWIFT. Their hard X-ray spectra above 20keV can be described by a power law with photon index of~0.5-1.5. The possible turn- off energy for lE1841-045 has been determined at around 120keV. This non-thermal hard emission should have a different origin from the soft thermal emission of AXPs below 10keV. 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.

关键词： pulsars individual-Gamma-rays observations

作者: W. Wang

作者单位: Max-Planck-Institut fur extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany National A stronomical Observatories, Chinese Academy of Sciences, Beijing 100012 China

会议类型: 国际会议

会议名称: 紧凑型物体的天体物理学国际会议(International Conference on Astrophysics of Compact Objects)

会议地点: 安徽黄山

会议语种:英文

页码: 101-103

在线出版日期: 2007-07-01（万方平台首次上网日期，不代表论文的发表时间）