3C\，84多成分核的时间演化观察
Observing the Time Evolution of the Multi-Component Nucleus of 3C\,84
摘要：
近年来，全球毫米波段甚长基线干涉测量（VLBI）的出现，终于揭示了M1，87和3C 1，84中两个最突出的邻近明亮河外射电喷流的底部形态。考虑到射流理论和当前数值模拟的预测，这些图像是相当令人惊讶的。与预期相比，喷气机基地非常宽，3C，84的核心非常复杂。利用射电天文台22 GHz的天基VLBI观测，在86 GHz的观测中，它表现为一个分辨率为50，$μ$的双核，一个分辨率为30，$μ$的三核。更奇怪的是，在150 μ s，$μ$（$-$ 4 μ s）尺度上，双、三次急流沿一条与南北大尺度急流近似正交的东西线排列。我们探索了2018年8月至2020年4月在较低分辨率43 GHz甚长基线阵列（VLBA）成像中出现的（东西）双核。双胞胎勉强解决了。我们利用与最长基线$\sim 0.08$ \，mas相关的东西向分辨率来跟踪主要为$\approx 0.086\pm 0.008$ \，c的东西向分离速度。我们估计，所观察到的温和的相对论性速度持续超过一个去投影的距离$\sim 1900-9800$倍的中心，超大质量黑洞，引力半径（$\sim 0.3-1.5$ \，lt-yrs）从原点。
英文摘要：
The advent of global mm-band Very Long Baseline Interferometry (VLBI) in recent years has finally revealed the morphology of the base of the two most prominent nearby, bright, extragalactic radio jets in M\,87 and 3C\,84. The images are quite surprising considering the predictions of jet theory and current numerical modeling. The jet bases are extremely wide compared to expectations and the nucleus of 3C\,84 is very complicated. It appears as a double in 86\,GHz observations with 50\,$μ$as resolution and a triple nucleus with 30\,$μ$as resolution with space-based VLBI by RadioAstron at 22\,GHz. What is even odder is that the double and triple are arranged along an east-west line that is approximately orthogonal to the north-south large scale jet on 150\,$μ$as $-$ 4\,mas scales. We explore the emergence of an (east-west) double nucleus in the lower resolution 43\,GHz Very Long Baseline Array (VLBA) imaging from August 2018 to April 2020. The double is marginally resolved. We exploit the east-west resolution associated with the longest baselines, $\sim 0.08$\,mas, to track a predominantly east-west separation speed of $\approx 0.086\pm 0.008$\,c. We estimate that the observed mildly relativistic speed persists over a de-projected distance of $\sim 1900-9800$ times the central, supermassive black hole, gravitational radius ($\sim 0.3-1.5$\,lt-yrs) from the point of origin.
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