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arXiv 1401.6965astro-ph.HE
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磁星Swift J1822 .3 $-$ 1606的长期爆发后自旋下降和通量弛豫

The long-term post-outburst spin down and flux relaxation of magnetar Swift J1822.3$-$1606

P. Scholz, V. M. Kaspi, A. Cumming

摘要:

Swift J1822.3 $-$ 1606在2011年7月进入爆发阶段。以前的X射线研究其爆发后的旋转演化产生了不一致的测量自旋推断磁场。在这里,我们提出的时间行为和通量松弛超过两年的斯威夫特,XTE和钱德拉观测后爆发。我们发现,在以前的时间解决方案的模糊性是由于增强的自旋下降,类似于一个指数恢复后的突发发作的小故障。在拟合出恢复的影响后,我们测量了$\dotν=(-3.0\pm0.3)\times10^{-8}$的$^{-2}$的长期自旋下降速率,这意味着$1.35\times10^{13}$ G的偶极磁场,低于以前对该源的所有估计。我们还考虑了爆发后的通量演化,并将其与经验模型和地壳冷却模型相拟合。我们讨论的背景下,地壳冷却和磁层弛豫模型的通量弛豫。

英文摘要:

The magnetar Swift J1822.3$-$1606 entered an outburst phase in 2011 July. Previous X-ray studies of its post-outburst rotational evolution yielded inconsistent measurements of the spin-inferred magnetic field. Here we present the timing behavior and flux relaxation from over two years of Swift, XTE, and Chandra observations following the outburst. We find that the ambiguity in previous timing solutions was due to enhanced spin down that resembles an exponential recovery following a glitch at the outburst onset. After fitting out the effects of the recovery, we measure a long-term spin-down rate of $\dotν=(-3.0\pm0.3)\times10^{-8}$ s$^{-2}$ which implies a dipolar magnetic field of $1.35\times10^{13}$ G, lower than all previous estimates for this source. We also consider the post-outburst flux evolution, and fit it with both empirical and crustal cooling models. We discuss the flux relaxation in the context of both crustal cooling and magnetospheric relaxation models.

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