A new HST measurement of the Crab Pulsar proper motion
A new HST measurement of the Crab Pulsar proper motion
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DOI：
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发表时间：
1999-01
影响因子：
6.5
通讯作者：
P. Caraveo;R. Mignani
中科院分区：
文献类型：
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作者：
P. Caraveo;R. Mignani
我们使用了一组存档的HST/WFPC2蟹状星云内部区域的照片，获得了脉冲星固有运动的新测量，这是继20多年前Wyckoff和Murray的原始工作之后的第一次测量。我们对脉冲星位移的测量值为1 83 mas yr 1，与先前得到的值吻合得很好。这是值得注意的，因为我们使用的数据跨度不到2年，而不是在以前的工作中要求的77年。根据ROSAT观测到的x射线喷流方向，当位置角为2910时，其固有运动矢量与蟹状星云内部的对称轴对齐。事实上，如果中子星的旋转是x射线喷射和观测到的对称性的原因，那么蟹状星云可以提供一个自转轴与固有运动对齐的例子。
We have used a set of archived HST/WFPC2 expo- sures of the inner regions of the Crab Nebula to obtain a new measurement of the pulsar proper motion, the first after the orig- inal work of Wyckoff & Murray, more than 20 years ago. Our measurement of the pulsar displacement, =1 83 mas yr 1 , agrees well with the value obtained previously. This is note- worthy, since the data we have used span less than 2 years, as opposed to the 77 years required in the previous work. With a position angle of 292 10, the proper motion vec- tor appears aligned with the axis of symmetry of the inner Crab nebula, as defined by the direction of the X-ray jet observed by ROSAT. Indeed, if the neutron star rotation is to be held respon- sible both for the X-ray jet and for the observed symmetry, the Crab could provide an example of alignment between spin axis and proper motion.