激发Westerlund 1中磁星CXOU J164710 .2-455216的磁层
Exciting the Magnetosphere of the Magnetar CXOU J164710.2-455216 in Westerlund 1
摘要：
我们描述了在2006年9月21日用Swift探测到的两个显著事件之前4.3天和之后1.5天从候选磁星CXYJ 164710.2 -455216进行的XMM-牛顿观测：（1）能量为1 e37 erg（15-150 keV）的20 ms脉冲群，以及（2）分数周期变化为1 e-4的快速自旋下降（毛刺）。我们发现，脉冲星的光度增加了100倍的观测间隔，从1 e33至1 e35 erg/s（0.5-8.0 keV），其光谱硬化。脉冲计数率增加了10倍（0.5-8.0千电子伏），但脉冲的分数均方根幅度从65%下降到11%，其轮廓从单峰变为三峰。在其他磁星上也观察到类似的变化，例如2002年6月1 E 2259+586的爆发。我们认为，中子星外壳的塑性形变引起了外部磁场的轻微扭曲，这反过来又在磁层中产生了电流，这是X射线爆发的直接原因。
英文摘要：
We describe XMM-Newton observations taken 4.3 days prior to and 1.5 days subsequent to two remarkable events that were detected with Swift on 2006 September 21 from the candidate magnetar CXOU J164710.2-455216: (1) a 20 ms burst with an energy of 1e37 erg (15-150 keV), and (2) a rapid spin-down (glitch) with a fractionap period change of 1e-4. We find that the luminosity of the pulsar increased by a factor of 100 in the interval between observations, from 1e33 to 1e35 erg/s (0.5-8.0 keV), and that its spectrum hardened. The pulsed count rate increased by a factor of 10 (0.5-8.0 keV), but the fractional rms amplitude of the pulses decreased from 65 to 11 per cent, and their profile changed from being single-peaked to exhibiting three peaks. Similar changes have been observed from other magnetars in response to outbursts, such as that of 1E 2259+586 in 2002 June. We suggest that a plastic deformation of the neutron star's crust induced a very slight twist in the external magnetic field, which in turn generated currents in the magnetosphere that were the direct cause of the X-ray outburst.
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