论文标题
用EHT观察到的M 87中央超级黑洞的喷气和解决的特征
The jet and resolved features of the central supermassive black hole of M 87 observed with EHT
论文作者
论文摘要
我们从事件地平线望远镜合作者（EHTC）的公共数据中报告了M 87的独立图像重建。我们的结果与EHTC发布的图像不同。我们的分析表明，（a）在230 GHz时的结构与较低频率VLBI观察结果一致，（b）在230 GHz处的射流结构从核心延伸到几个MAS，尽管沿轴的强度迅速降低，并且（c）未分辨的核心分解为明亮的三个特征，均以大约70 deg的范围射击，这表明了一个最初的射程。 EHTC的环状结构不仅可以从公共数据中创建，而且可以从点图像的模拟数据创建。另外，环对FOV尺寸非常敏感。 EHT的U-V覆盖范围缺乏大约40个Micro-ASEC边缘间距。结合非常狭窄的FOV，它创建了40个Micro-ASEC环结构。我们得出的结论是，由于狭窄的FOV设置和EHT阵列的U-V数据采样偏差效应，因此EHTC结果中的射流不存在和环中的存在。由于EHTC的仿真仅考虑了输入映像模型的再现，而不是输入噪声模型的复制，因此它们的最佳参数可以增强采样偏差的效果并产生诸如40个Micro-ASEC环结构的伪影，而不是重现正确的图像。
We report our independent image reconstruction of the M 87 from the public data of the Event Horizon Telescope Collaborators (EHTC). Our result is different from the image published by the EHTC. Our analysis shows that (a) the structure at 230 GHz is consistent with those of lower frequency VLBI observations, (b) the jet structure is evident at 230 GHz extending from the core to a few mas, though the intensity rapidly decreases along the axis, and (c) the unresolved core is resolved into bright three features presumably showing an initial jet with a wide opening angle of about 70 deg. The ring-like structures of the EHTC can be created not only from the public data, but also from the simulated data of a point image. Also, the rings are very sensitive to the FOV size. The u-v coverage of EHT lack about 40 micro-asec fringe spacings. Combining with a very narrow FOV, it created the 40 micro-asec ring structure. We conclude that the absence of the jet and the presence of the ring in the EHTC result are both artifacts owing to the narrow FOV setting and the u-v data sampling bias effect of the EHT array. Because the EHTC's simulations only take into account the reproduction of the input image models, and not those of the input noise models, their optimal parameters can enhance the effects of sampling bias and produce artifacts such as the 40 micro-asec ring structure, rather than reproducing the correct image.
