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https://arxiv.org/pdf/2205.04623.pdf The jet and resolved features of the central supermassive black hole of M 87 observed with EHT Makoto Miyoshi, 1 Yoshiaki Kato2 And Junichiro Makino3 6. CONCLUSION Using the public data released by the EHTC, we obtained images of the central region of M 87 using the improved calibration obtained using the standard hybrid mapping method. As a result, we found the following. 1. The core of M 87 is resolved into a core-knot structure, instead of a ring. Three features C, K and W are seen. While feature C is definitely a core and feature K is a knot, feature W is not so easy to explain. Feature W may be a lensing image due to the strong gravity of SMBH. Another possibility is that there are two SMBH system and that feature W is another SMBH in the core of M 87. Assuming that W is another knot, the three features could be initial jet structures with an opening angle of ∼ 70◦ at a distance of about 10 Rs from the core. 2. The 230 GHz image has a jet structure consistent with the previous lower-frequency observations. It has brightened edges from the core to at a few mas points. The intensity is decreased along the jet axis much rapidly as compared with lower observations. 3. The ∼ 40 µas ring that the EHTC reported is an artifact due to the effect of data sampling bias and the very narrow FOV setting that enhances the bias effect. The u-v coverage of the EHT for M 87 observations lacks the ∼ 40 µas spatial Fourier components that produce artifact structures of ∼ 40 µas size. |
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