A GENERAL RELATIVISTIC NULL HYPOTHESIS TEST WITH EVENT HORIZON TELESCOPE OBSERVATIONS OF THE BLACK HOLE SHADOW IN Sgr A*
A GENERAL RELATIVISTIC NULL HYPOTHESIS TEST WITH EVENT HORIZON TELESCOPE OBSERVATIONS OF THE BLACK HOLE SHADOW IN Sgr A*
复制标题
用事件视界望远镜观测人马座A*黑洞阴影的一般相对论零假设检验
DOI：
10.1088/0004-637x/814/2/115
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
D. Marrone
中科院分区：
文献类型：
--
作者：
D. Psaltis;F. Özel;Chi;D. Marrone
克尔黑洞阴影的半开口角总是等于(5±0.2)Gm/DC2，其中M是黑洞的质量，D是它到地球的距离。因此，测量阴影的大小并验证它是否在这4%的范围内，构成了广义相对论的零假设检验。我们表明，银河系中心的黑洞SgrA*是利用事件视界望远镜(EHT)即将进行的观测进行这项测试的最佳目标。我们利用光学/红外对恒星轨道的监测结果表明，SgrA*的质量/距离比已知的精度为∼4%。我们调查了SgrA*和地球之间的散射屏的属性的先验知识，需要对其影响进行校正，以便使黑洞阴影在背景辐射的映衬下显得尖锐。最后，我们探索了一种干涉数据的边缘检测方案和一种基于霍夫/拉冬变换的模式匹配算法，并证明了1.3 mm处的黑洞阴影原则上可以定位到∼9%以内。所有这些结果表明，我们对黑洞的性质、散射展宽和吸积流的先验知识只能将SgrA*的EHT观测的广义相对论零假设检验限制在≲的10%以内。
The half opening angle of a Kerr black hole shadow is always equal to (5 ± 0.2)GM/Dc2, where M is the mass of the black hole and D is its distance from the Earth. Therefore, measuring the size of a shadow and verifying whether it is within this 4% range constitutes a null hypothesis test of general relativity. We show that the black hole in the center of the Milky Way, Sgr A*, is the optimal target for performing this test with upcoming observations using the Event Horizon Telescope (EHT). We use the results of optical/IR monitoring of stellar orbits to show that the mass-to-distance ratio for Sgr A* is already known to an accuracy of ∼4%. We investigate our prior knowledge of the properties of the scattering screen between Sgr A* and the Earth, the effects of which will need to be corrected for in order for the black hole shadow to appear sharp against the background emission. Finally, we explore an edge detection scheme for interferometric data and a pattern matching algorithm based on the Hough/Radon transform and demonstrate that the shadow of the black hole at 1.3 mm can be localized, in principle, to within ∼9%. All these results suggest that our prior knowledge of the properties of the black hole, of scattering broadening, and of the accretion flow can only limit this general relativistic null hypothesis test with EHT observations of Sgr A* to ≲10%.
利用光学长基线干涉测量对天体物理物体的核心进行成像
DOI：
10.1007/s00159-012-0053-0
发表时间：
2012
期刊：
The Astronomy and Astrophysics Review
影响因子：
--
作者：
Berger J
通讯作者：
Berger J