可以利用Maser+度规测活动星系核中心黑洞的质量
可以利用Maser+度规测活动星系核中心黑洞的质量
2022年6月6日
少文介绍的一篇文章
General Relativity and Quantum Cosmology
[Submitted on 10 Dec 2020 (v1), last revised 13 Aug 2021 (this version, v2)]
Toward the Gravitational Redshift Detection in NGC 4258 and the Estimation of its Black Hole Mass-to-Distance Ratio
We construct from first principles a general relativistic approach to study Schwarzschild black hole (BH) rotation curves and estimate the mass-to-distance ratio of the active galactic nucleus of NGC 4258 in terms of astrophysical observable quantities. The presented method allows one to clearly distinguish and quantify the general and special relativistic contributions to the total redshift expression. The total relativistic redshift/blueshift comprises three components: the gravitational redshift due to the spacetime curvature generated by the mass of the BH in its vicinity, the kinematic shift, originated by the photons' local Doppler effect, and the redshift due to a special relativistic boost that describes the motion of a galaxy from a distant observer. We apply our method to the largest data set of highly redshifted water megamaser measurements on the accretion disk of the NGC 4258 active galaxy and use this general relativistic method to estimate its BH mass-to-distance ratio: M/D = (0.5326 +/- 0.00022) x 10^7 solar masses/Mpc.
应该是脉泽的谱线可以测得比较精确, 而另外有办法把运动学红移, 史瓦西黑洞的引力红移, 开普勒运动的运动学红移给区分开. 从而单独把引力红移提取出来, 得到黑洞质量. 不过得到的是M/D, 里边还有简并.
(那岂不是换个Kerr度规, 还可以测自旋?)
这个公式确实把各项红移都分开了, 而且和re相关, 那么如果确定了不同的re的红移值, 不就可以得到m了?
但文章貌似不是这么干的, 不知道M/D到底是啥, 难道就是到我们的距离? 那银河系的黑洞不管啦? (是不是因为银河系的黑洞质量小? 那NGC 4258附近的大黑洞怎么办?)
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