A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty
A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty
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DOI：
10.1051/0004-6361/201935656
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发表时间：
2019-05-20
影响因子：
6.5
通讯作者：
Yazici, S.
中科院分区：
文献类型：
--
作者：
Abuter, R.;Amorim, A.;Yazici, S.
我们给出了到银河系中心的距离R-0的0.16%和0.27%的精确度。我们的测量使用了恒星S2围绕大质量黑洞SgrA*运行16年的轨道，我们从天体测量学和光谱学上跟踪了SgrA*长达27年。自2017年以来，我们利用VLTI合束器重力添加了近红外干涉测量，在最好的情况下，可以直接测量S2和SgrA*之间的分离矢量，精度高达20微米。2018年5月，S2经过了其高度偏心轨道的近地点，我们全年都在紧随其后进行密集采样。再加上我们的光谱学，在误差为7公里的S(-1)的最佳情况下，这给出了几何距离估计R-0=8178+/-13(统计)+/-22(系统)。个人电脑。这项工作更新了我们之前发表的文章，在那篇文章中，我们报道了在S2数据中首次探测到引力红移。现在以20sigma的显著水平检测到红移项，其中f(红移)=1.04+/-0.05。
We present a 0.16% precise and 0.27% accurate determination of R-0, the distance to the Galactic center. Our measurement uses the star S2 on its 16-year orbit around the massive black hole Sgr A* that we followed astrometrically and spectroscopically for 27 years. Since 2017, we added near-infrared interferometry with the VLTI beam combiner GRAVITY, yielding a direct measurement of the separation vector between S2 and Sgr A* with an accuracy as good as 20 mu as in the best cases. S2 passed the pericenter of its highly eccentric orbit in May 2018, and we followed the passage with dense sampling throughout the year. Together with our spectroscopy, in the best cases with an error of 7 km s(-1), this yields a geometric distance estimate of R-0 = 8178 +/- 13(stat.) +/- 22(sys.) pc. This work updates our previous publication, in which we reported the first detection of the gravitational redshift in the S2 data. The redshift term is now detected with a significance level of 20 sigma with f(redshift) = 1.04 +/- 0.05.