Spectral properties of anomalous X-ray pulsars

Details Spectral properties of anomalous X-ray pulsars Spectral properties of anomalous X-ray pulsars

2003-04-28

arxiv.org/abs/astro-ph/0304487v2

Chin.J.Astron.Astrophys. 3 (2003) 543-550

Astronomy and Astrophysics

Astrophysics

11pages, 3 figures, Chin. J. Astron. Astrophys. in press

Scientific paper

In this paper, the spectra of the persistent emission from anomalous X-ray pulsars (AXPs) and their variation with spin-down rate $\dot{\Omega}$ is considered. Firstly, based on an accretion-powered model, the influences of both magnetic field and mass accretion rate on the spectra properties of AXPs are addressed. Subsequently, the relation between the spectral property of AXPs and mass accretion rate $\dot{M}$ is investigated. The result shows that there exists a linear correlation between the photon index and mass accretion rate, and the spectral hardness increases with increasing $\dot{M}$. A possible emission mechanism for the explanation of spectral properties of AXPs is also discussed.

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