脉冲星视差测量中的Lutz-Kelker偏差
Lutz-Kelker bias in pulsar parallax measurements
摘要：
Lutz和Kelker指出，视差测量被系统性地高估了，因为它们不能正确地解释在较小视差值下采样的较大空间体积。我们把他们的分析应用到中子星上，把由内禀射电光度函数引入的偏差和一个现实的中子星的银河系人口模型结合起来。我们估计了所有已发表的中子星视差测量的偏差，并发现测量小于~95%的确定性，很可能是显着的偏见。通过检查历史视差测量，我们确认所描述的影响，在光学和无线电测量，以及在距离估计的基础上星际色散措施。简要讨论了脉冲星计时对未来相对论引力测试的潜在影响，以及对基于X射线的中子星半径估算的潜在影响。
英文摘要：
Lutz & Kelker showed that parallax measurements are systematically overestimated because they do not properly account for the larger volume of space that is sampled at smaller parallax values. We apply their analysis to neutron stars, incorporating the bias introduced by the intrinsic radio luminosity function and a realistic Galactic population model for neutron stars. We estimate the bias for all published neutron star parallax measurements and find that measurements with less than ~95% certainty, are likely to be significantly biased. Through inspection of historic parallax measurements, we confirm the described effects in optical and radio measurements, as well as in distance estimates based on interstellar dispersion measures. The potential impact on future tests of relativistic gravity through pulsar timing and on X-ray--based estimates of neutron star radii is briefly discussed.
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