钱德拉天体测量为SGR 1900+14的自行设定了严格的上限
Chandra astrometry sets a tight upper limit to the proper motion of SGR 1900+14
摘要：
软伽马射线中继器（SGR）SGR 1900+14位于壳层超新星遗迹（SNR）G42.8+0.6边缘外几角分处。这两个系统之间的物理关联已被提出-为这个和其他SGR-SNR对-基于磁星模型框架中SGR的高空间速度的预期。SGR和SNR中心之间的大角度分离，加上系统的年轻，建议与自行测量的关联测试。我们使用了一组三个钱德拉/ACIS观测的领域跨越5年，以执行准确的相对天体测量，以测量可能的角位移的SGR作为时间的函数。我们的调查设定了一个3西格玛上限为70 mas/年的SGR的整体自行。这样的数值反驳了SGR 1900+14与G42.8+0.6的关联，并进一步支持了越来越多的证据，即SGR起源于附近紧凑的大质量恒星群。
英文摘要：
The soft gamma-ray repeater (SGR) SGR 1900+14 lies a few arcminutes outside the edge of the shell supernova remnant (SNR) G42.8+0.6. A physical association between the two systems has been proposed - for this and other SGR-SNR pairs - based on the expectation of high space velocities for SGRs in the framework of the magnetar model. The large angular separation between the SGR and the SNR center, coupled with the young age of the system, suggest a test of the association with a proper motion measurement. We used a set of three Chandra/ACIS observations of the field spanning 5 years to perform accurate relative astrometry in order to measure the possible angular displacement of the SGR as a function of time. Our investigation sets a 3-sigma upper limit of 70 mas/yr to the overall proper motion of the SGR. Such a value argues against an association of SGR 1900+14 with G42.8+0.6 and adds further support to the mounting evidence for an origin of the SGR within a nearby, compact cluster of massive stars.
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