两颗磁星自行的约束
Constraining the Proper Motions of Two Magnetars
摘要：
我们试图测量两个磁星的自行-软伽马射线中继SGR 1900+14和异常X射线脉冲星1 E 2259+586 -使用钱德拉观测的两个时代，间隔约5年。我们使用这些数据、存档数据和模拟进行广泛的测试，以验证我们测量的准确性并了解其局限性。我们发现90%的上限自行54 mas/yr（SGR 1900+14）和65 mas/yr（1 E 2259+586），与限制在很大程度上取决于我们可以注册的两个时代的数据的准确性和两点自行的固有不确定性。我们用距离将自行极限转化为横向速度极限，发现v_perp < 1300 km/s（SGR 1900+14，距离5 kpc）和v_perp < 930 km/s（1 E 2259+586，距离为3 kpc），置信度为90%;这些物体可能的距离范围使得速度范围很广，但磁星似乎并不具有大于3000 km/s的均匀高空间速度。不幸的是，我们的自行也不能显著地约束先前提出的这些物体在附近超新星遗迹或星团中的起源，这既受到我们对年龄的无知的限制，也受到我们自行的限制。
英文摘要：
We attempt to measure the proper motions of two magnetars - the soft gamma-ray repeater SGR 1900+14 and the anomalous X-ray pulsar 1E 2259+586 - using two epochs of Chandra observations separated by ~5 yr. We perform extensive tests using these data, archival data, and simulations to verify the accuracy of our measurements and understand their limitations. We find 90% upper limits on the proper motions of 54 mas/yr (SGR 1900+14) and 65 mas/yr (1E 2259+586), with the limits largely determined by the accuracy with which we could register the two epochs of data and by the inherent uncertainties on two-point proper motions. We translate the proper motions limits into limits on the transverse velocity using distances, and find v_perp < 1300 km/s (SGR 1900+14, for a distance of 5 kpc) and v_perp < 930 km/s (1E 2259+586, for a distance of 3 kpc) at 90% confidence; the range of possible distances for these objects makes a wide range of velocities possible, but it seems that the magnetars do not have uniformly high space velocities of > 3000 km/s. Unfortunately, our proper motions also cannot significantly constrain the previously proposed origins of these objects in nearby supernova remnants or star clusters, limited as much by our ignorance of ages as by our proper motions.
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