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arXiv 1508.04527astro-ph.HE
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反常X射线双星和软$γ$射线中继星的宽带X射线谱:弱吸积区的双星?

Broad-band X-ray spectra of anomalous X-ray pulsars and soft $γ$-ray repeaters: pulsars in a weak-accretion regime ?

A. Zezas, J. E. Trümper, N. D. Kylafis

摘要:

本文给出了对5颗反常X射线脉冲星(AXP)和软$γ$射线重复源(SGR)的宽波段X射线谱的分析结果。我们用适合于吸积流到脉冲星的X射线发射的模型拟合了它们的Suzaku和INTEGRAL谱。我们发现它们的X射线谱可以用这个模型很好地描述。我们尤其发现:(a)吸积柱的半径为$\sim150-350$ m,导致横向光学深度为$\sim 1$ ;(b)垂直汤普森光学深度为$\approx 50-400$;(c)它们的光度转化为吸积率$\approx10^{15}\rm{g\, s^{-1}}$。这些结果与回退盘模型的预测吻合得很好,为解释AXP和SGR作为吸积星提供了进一步的支持。

英文摘要:

We present the results from the analysis of the broad-band X-ray spectra of 5 Anomalous X-ray Pulsars (AXPs) and Soft $γ$-ray Repeaters (SGRs). We fit their Suzaku and INTEGRAL spectra with models appropriate for the X-ray emission from the accretion flow onto a pulsar. We find that their X-ray spectra can be well described with this model. In particular we find that: (a) the radius of the accretion column is $\sim150-350$ m resulting in a transverse optical depth of $\sim 1$; (b) the vertical Thompson optical depth is $\approx 50-400$, and (c) their luminosity translates in accretion rates $\approx10^{15}\rm{g\, s^{-1}}$. These results are in good agreement with the predictions from the fall-back disk model, providing further support in the interpretation of AXPs and SGRs as accreting pulsars.

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