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arXiv 1401.5705astro-ph.HE
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异常X射线脉冲星1RXS J170849.0 - 400910的长期定时和毛刺特征

Long-Term Timing and Glitch Characteristics of Anomalous X-ray Pulsar 1RXS J170849.0-400910

Sinem Sasmaz Mus, Ersin Gogus

摘要:

利用Rossi X射线定时探测器(RXTE)从2005年到RXTE任务结束的6年间的观测资料,对一颗异常X射线脉冲星1RXS J170849.0 - 400910的定时进行了详细的研究.我们构建了源的长期自旋特性,并研究了脉冲轮廓和脉冲计数率的时间和能量依赖性。我们发现,脉冲轮廓和脉冲计数率在2 - 10 keV波段没有显示出任何显着的变化,在~6年。1RXS J170849.0 - 400910是最常发生故障的异常X射线脉冲星:在2005年之前观察到三个自旋向上故障和三个候选故障。我们在时间轴中对后续故障的广泛搜索没有发现明确的故障,尽管我们在两个数据间隙中确定了两个故障候选项(Delta(nu)/nu~10 ^{-6}):一个强候选项围绕MJD 55532,另一个围绕MJD 54819,后者的鲁棒性稍差。我们讨论了我们的结果的背景下,脉冲星毛刺模型和预期的毛刺内的旋涡unpinning模型。

英文摘要:

We present the results of our detailed timing studies of an anomalous X-ray pulsar, 1RXS J170849.0-400910, using Rossi X-ray Timing Explorer (RXTE) observations spanning over ~6 yr from 2005 until the end of RXTE mission. We constructed the long-term spin characteristics of the source and investigated time and energy dependence of pulse profile and pulsed count rates. We find that pulse profile and pulsed count rates in the 2-10 keV band do not show any significant variations in ~6 yr. 1RXS J170849.0-400910 has been the most frequently glitching anomalous X-ray pulsar: three spin-up glitches and three candidate glitches were observed prior to 2005. Our extensive search for glitches later in the timeline resulted in no unambiguous glitches though we identified two glitch candidates (with Delta(nu)/nu ~10^{-6}) in two data gaps: a strong candidate around MJD 55532 and another one around MJD 54819, which is slightly less robust. We discuss our results in the context of pulsar glitch models and expectancy of glitches within the vortex unpinning model.

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