黑洞喷流模型作为M87事件视界望远镜观测诊断工具的约束条件
Constraints on Black Hole Jet Models Used As Diagnostic Tools of Event Horizon Telescope Observations of M87
摘要：
事件视界望远镜（EHT）数据的喷流模型也应该符合下游观测到的喷流剖面。这项研究评估符合黑洞喷流的图像的M87的最里面的喷流模型。这是一个基本的测试，在使用它们对EHT数据进行物理解释之前应该通过。最近对M87的86 GHz甚长基线干涉仪观测首次揭示了其源附近喷流的形态和大小（$<65$ \，M，或在对喷流的视线进行校正后的0.06 lt-yrs，其中$M$是几何单位中的黑洞质量）。目前的横向分辨率表明，这一地区主要是由从边缘的射流发出的通量。所观察到的内喷流配置文件进行比较，所有现有的出版的合成无线电图像构建的“最先进的”3-D数值模拟的黑洞吸积系统在M87。尽管努力产生特征性的宽的、边缘主导的喷流，这些模型在距离源0.06 - 0.32 lt-yrs的区域内太窄（因子为$\sim2$），即使在图像平面中的喷流（脊和/或鞘）可能在更远的下游出现一致。此外，从源起0.06 - 0.32 lt-yrs的合成无线电图像不是边缘主导的，而是脊主导的。因此，将这些模型作为EHT能见度振幅的物理诊断的分析是可疑的。因此，这些内喷流特性是应用模拟EHT数据之前的重要考虑因素。
英文摘要：
Jet models of Event Horizon Telescope (EHT) data should also conform to the observed jet profiles just downstream. This study evaluates conformance of models of black hole jets to images of the innermost jet of M87. This is a basic test that should be passed before using them to perform a physical interpretation of EHT data. Recent 86 GHz Very Long Baseline Interferometry observations of M87 have revealed the morphology and size of the jet near its source ($<65$\,M, or 0.06 lt-yrs after correcting for line of sight to the jet, where $M$ is the black hole mass in geometrized units) for the first time. Current transverse resolution indicates that this region is dominated by flux emanating from the edge of the jet. The observed inner jet profiles are compared to all existing published synthetic radio images constructed from "state of the art" 3-D numerical simulations of the black hole accretion system in M87. Despite efforts to produce the characteristic wide, edge dominated jet, these models are too narrow (by a factor of $\sim2$) in the region 0.06 - 0.32 lt-yrs from the source, even though the jets (spine and/or sheath) in the image plane might appear conformant farther downstream. Furthermore, the synthetic radio images are not edge dominated 0.06 - 0.32 lt-yrs from the source, but spine dominated. Analyses that implement these models as physical diagnostics of EHT visibility amplitudes are therefore suspect. Thus, these inner jet characteristics are important considerations before applying simulations to the EHT data.
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