用高精度天体测量探测磁星形成通道：旋转最快的磁星Swift J1818 .0-1607的VLBA天体测量进展
Probing magnetar formation channels with high-precision astrometry: The progress of VLBA astrometry of the fastest-spinning magnetar Swift J1818.0-1607
摘要：
磁星拥有超强的磁场强度，是产生快速射电暴的主要候选者之一。关于磁星的形成机制，已经提出了几种理论，但尚未得到充分验证。由于不同的磁星形成理论期望不同的磁星空间速度分布，因此对银河系磁星的高精度天体测量可以作为磁星形成理论的探索。此外，磁星天体测量可以改善对银河系磁星分布的理解。这种分布可以与螺旋星系中的快速射电暴（FRB）进行比较，以测试FRB和磁星之间的联系。雨燕J1818.0-1607是迄今为止自转速度最快的磁星，也是第五颗被发现的射电磁星。在一项正在进行的天体测量活动中，我们使用甚长基线阵列对斯威夫特J1818.0-1607进行了为期一年的观测，并确定了磁星的精确自行和暂定视差。
英文摘要：
Boasting supreme magnetic strengths, magnetars are among the prime candidates to generate fast radio bursts. Several theories have been proposed for the formation mechanism of magnetars, but have not yet been fully tested. As different magnetar formation theories expect distinct magnetar space velocity distributions, high-precision astrometry of Galactic magnetars can serve as a probe for the formation theories. In addition, magnetar astrometry can refine the understanding of the distribution of Galactic magnetars. This distribution can be compared against fast radio bursts (FRBs) localized in spiral galaxies, in order to test the link between FRBs and magnetars. Swift J1818.0-1607 is the hitherto fastest-spinning magnetar and the fifth discovered radio magnetar. In an ongoing astrometric campaign, we have observed Swift J1818.0-1607 for one year using the Very Long Baseline Array, and have determined a precise proper motion as well as a tentative parallax for the magnetar.
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