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arXiv 1210.7680astro-ph.HEastro-ph.CO
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雨燕J045106 .8-694803;位于大麦云星云的一颗高磁化中子星

Swift J045106.8-694803; a highly magnetised neutron star in the Large Magellanic Cloud

Helen Klus, Elizabeth S. Bartlett, Antony J. Bird, Malcolm Coe, Robin Corbet, Andrzej Udalski

摘要:

本文报道了对大麦云星云(LMC)中一颗高磁化中子星的分析。高质量X射线脉冲双星Swift J045106.8-694803在2008年被Swift X射线望远镜(XRT)观测到,在2011年被Rossi X射线定时探测器(RXTE)观测到,在2012年被X射线多镜任务-牛顿(XMM-牛顿)观测到。在这四年中,自旋周期的变化表明自旋上升速率为-5.01+/-0.06秒/年,是观测到的吸积脉冲星中最高的。这种自旋加速率可以用Ghosh和Lamb(1979)的吸积理论来解释,假设它有一个(1.2 + 0.2 - 0.7 x10^14高斯)的磁场。这超过了量子临界场值。很少有吸积星具有如此高的表面磁场,这是第一次在大麦哲伦星系中发现。大的旋转速率与雨燕爆发警报望远镜(BAT)的观测结果一致,该观测结果表明雨燕J045106.8-694803至少在五年内一直具有高X射线光度。光谱已经被用来将雨燕J045106.8-694803的光学对应物分类为B 0 -1 III-V星,并且通过测光发现它的轨道周期可能为21.631+/-0.005天。

英文摘要:

We report the analysis of a highly magnetised neutron star in the Large Magellanic Cloud (LMC). The high mass X-ray binary pulsar Swift J045106.8-694803 has been observed with Swift X-ray telescope (XRT) in 2008, the Rossi X-ray Timing Explorer (RXTE) in 2011 and the X-ray Multi-Mirror Mission - Newton (XMM-Newton) in 2012. The change in spin period over these four years indicates a spin-up rate of -5.01+/-0.06 s/yr, amongst the highest observed for an accreting pulsar. This spin-up rate can be accounted for using Ghosh and Lamb's (1979) accretion theory assuming it has a magnetic field of (1.2 +0.2 -0.7)x10^14 Gauss. This is over the quantum critical field value. There are very few accreting pulsars with such high surface magnetic fields and this is the first of which to be discovered in the LMC. The large spin-up rate is consistent with Swift Burst Alert Telescope (BAT) observations which show that Swift J045106.8-694803 has had a consistently high X-ray luminosity for at least five years. Optical spectra have been used to classify the optical counterpart of Swift J045106.8-694803 as a B0-1 III-V star and a possible orbital period of 21.631+/-0.005 days has been found from MACHO optical photometry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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