Spectral Properties of Anomalous X-ray Pulsars

作     者：Ye Lu, Wei Wang and Yong-Heng ZhaoNational Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 

作者机构：National Astronomical Observatories CAS NAOC Beijing 100012 China 

出 版 物：《Chinese Journal of Astronomy and Astrophysics》 (中国天文和天体物理学报（英文版）)

年 卷 期：2003年第3卷第6期

页      面：543-550页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：Supported by the National Natural Science Foundation of China 

主　　题：pulsars: general stars: neutron X-rays: stars accretion: accretion disks 

摘      要：We examine the spectra of the persistent emission from anomalous X-ray pulsars (AXPs) and their variation with the spin-down rate . Based on an accretion-powered model, the influences of both the magnetic field and the mass accretion rate on the spectral properties of AXPs are addressed. We then investigate the relation between the spectral property of AXPs and mass accretion rate . The result shows that there exists a linear correlation between the photon index and the mass accretion rate: the spectral hardness increases with increasing . A possible emission mechanism for the explanation of the spectral properties of AXPs is also discussed.