论文标题
测量M 87*图像的椭圆度
Measuring the Ellipticity of M 87* Images
论文作者
论文摘要
Galaxy M 87中心的超质量黑洞的事件地平线望远镜（EHT）图像提供了地平线上的吸积环境的第一个图像。鉴于黑洞M 87*的倾斜角度，一般相对论预测阴影的图像应几乎是圆形的。 M 87*的图像重建中椭圆度的可靠检测可能会在水平尺度上发出新的重力物理。在这里，我们分析了EHT分析中使用的成像参数是否对环椭圆度敏感并测量M 87*椭圆度的约束。我们发现顶部套件无法恢复椭圆度。即使对于简单的几何模型，真椭圆度也是偏见的低，更喜欢圆环。因此，为了对M 87*的椭圆度进行约束，我们测量了550个模拟GRMHD模拟数据集的椭圆度。我们发现，固有轴比为2：1的图像与从EHT图像重建中看到的椭圆度一致。
The Event Horizon Telescope (EHT) images of the supermassive black hole at the center of the galaxy M 87 provided the first image of the accretion environment on horizon scales. General relativity predicts that the image of the shadow should be nearly circular, given the inclination angle of the black hole M 87*. A robust detection of ellipticity in the image reconstructions of M 87* could signal new gravitational physics on horizon scales. Here we analyze whether the imaging parameters used in EHT analyses are sensitive to ring ellipticity and measure the constraints on the ellipticity of M 87*. We find that the top set is unable to recover ellipticity. Even for simple geometric models, the true ellipticity is biased low, preferring circular rings. Therefore, to place a constraint on the ellipticity of M 87*, we measure the ellipticity of 550 simulated data sets of GRMHD simulations. We find that images with intrinsic axis ratios of 2:1 are consistent with the ellipticity seen from the EHT image reconstructions.
