论文标题
系统错误作为黑洞微透镜事件中质量差异的来源OGE-2011-BLG-0462
Systematic errors as a source of mass discrepancy in black hole microlensing event OGLE-2011-BLG-0462
论文作者
论文摘要
两个独立组报告了在微透镜事件中发现了一个孤立的深色恒星残留物OGE-2011-BLG-0462，基于光度地面的观测值以及与Hubble Space望远镜进行的星体测量相结合。这两种分析产生了差异质量测量值，第一组报告透镜对象是7.1 +/- 1.3太阳能块的黑洞，而另一组则得出结论，微透析事件是由中子星或低质量黑洞引起的（1.6-4.4 solar量）。在这里，我们仔细检查了可用的光度和天文数据，并得出结论，系统误差是导致差异测量的原因。我们发现镜头是一个孤立的黑洞，质量为7.88 +/- 0.82太阳能块，位于1.49 +/- 0.12 kpc。我们还研究了混合对星体微透镜测量准确性的影响。我们发现，源伴侣的低水平混合是对黑洞质量的星体微透镜测量的主要，以前未被认可的挑战。
Two independent groups reported the discovery of an isolated dark stellar remnant in the microlensing event OGLE-2011-BLG-0462 based on photometric ground-based observations coupled with astrometric measurements taken with the Hubble Space Telescope. These two analyses yielded discrepant mass measurements, with the first group reporting that the lensing object is a black hole of 7.1 +/- 1.3 solar masses whereas the other concluded that the microlensing event was caused by either a neutron star or a low-mass black hole (1.6-4.4 solar masses). Here, we scrutinize the available photometric and astrometric data and conclude that systematic errors are a cause of the discrepant measurements. We find that the lens is an isolated black hole with a mass of 7.88 +/- 0.82 solar masses located at a distance of 1.49 +/- 0.12 kpc. We also study the impact of blending on the accuracy of astrometric microlensing measurements. We find that low-level blending by source companions is a major, previously unrecognized, challenge to astrometric microlensing measurements of black hole masses.
