Parallax Observations with the Hubble Space Telescope Yield the Distance to Geminga
Parallax Observations with the Hubble Space Telescope Yield the Distance to Geminga
复制标题
哈勃太空望远镜的视差观测得出了到双子星的距离
DOI：
10.1086/310012
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
L. Taff
中科院分区：
文献类型：
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作者：
P. Caraveo;G. Bignami;R. Mignani;L. Taff
利用哈勃太空望远镜的观测数据，我们首次对中子星的年度视差进行了光学测量。这是X射线/γ脉冲星Geminga的对应物，关于Geminga的强烈自身运动已经有报道。利用WFPC2观测探测到这种运动产生的显著位移，这些观测是在预测的最大平行系数的日期进行的。得到的距离值为157pC(+59，-34)，正好与从X射线数据得出的宽范围的下限一致。这种测量解决了Geminga距离的长期问题，并允许首次精确地确定从电子伏特到千兆电子伏特的中子星光度。此外，反复精确的定位大大提高了我们对其自身运动的了解。
Using data from Hubble Space Telescope observations, we report the first optical measurement of the annual parallax of a neutron star. This is the counterpart of the X-ray/γ-ray pulsar Geminga, for which strong proper motion has already been reported. Significant displacement from such motion is detected using WFPC2 observations, taken at the dates of the maximum predicted parallactic factor. The resulting distance value is 157 pc (+59, -34), just consistent with the lower end of the wide range derived from X-ray data. This measurement solves the long-standing problem of Geminga's distance and allows for the first precise determination of a neutron star luminosity from electron volts to giga-electron volts. Moreover, the repeated precise positionings substantially improve our knowledge of its proper motion.