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arXiv 1105.1630astro-ph.HE
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AXP 1E 2259+586的\emph{RXTE}时序分析

\emph{RXTE} Timing Analysis of the AXP 1E 2259+586

Burcin Icdem, Altan Baykal, S. Cagdas Inam

摘要:

报道了异常X射线脉冲星1E 2259+586从2002年爆发到2010年10月的\emph{Rossi X-ray Timing Explorer}(\emph{RXTE})脉冲时序分析。我们的目的是在2002年故障后延长恢复阶段的工作,调查2007年发生的第二次故障所引起的变化,并寻找其他不寻常的事件,如果有的话,出现在正常的自旋下降趋势的来源。2002年故障的恢复给出了很好的拟合时,使用的螃蟹脉冲星的双指数故障模型,而不是标准的故障模型,在1360天的间隔后的第一个故障。接下来的260天的采样不够频繁,无法进行相位连接。在该间隔之后,我们的时序分析得出存在$\frac{Δν}ν\sim8.20(2)\times10^{-7}$的分数频率变化。此外,我们报告了两个频率偏移的分数变化,$\frac{Δν}ν\sim3\times10^{-8},-1\times10^{-8}$:第一个在MJD $\sim53750$有一个积极的分数频率变化,而第二个在MJD $\sim54880$的脉冲频率下降。这些频率偏移都类似于在射电望远镜中观察到的微小毛刺。

英文摘要:

We report the pulse timing analysis of \emph{Rossi X-ray Timing Explorer} (\emph{RXTE}) observations of the anomalous X-ray pulsar 1E 2259+586 from its 2002 outburst to October, 2010. Our objectives are to extend the work on the recovery stage after the 2002 glitch, investigate the variations caused by the second glitch which occurred in 2007 and look for other unusual events, if any, that arise in the regular spin-down trend of the source. The recovery of the 2002 glitch gives good fit when the two-exponential glitch model of the Crab pulsar is used, rather than the standard glitch model, in the 1360-day interval after the first glitch. The sampling of the following 260-day is not frequent enough to be phase-connected. After that interval, our timing analysis yields that there is a fractional frequency change of $\frac{Δν}ν\sim8.20(2)\times10^{-7}$. Moreover, we report two frequency shifts of fractional changes, $\frac{Δν}ν\sim3\times10^{-8},-1\times10^{-8}$: The first one at MJD $\sim53750$ had a positive fractional frequency change in contrast to the second one at MJD $\sim54880$ for which the pulse frequency decreased. These frequency shifts both resemble the microglitches observed in radio pulsars.

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