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Is the appearance of accretion disks of M87 and Sgr A* in EHT image, related to the nucleus being active or non-active?

The rings are not direct images of accretion disks. They are blurred images of the gravitationally lensed light from all around the black holes, with a central "shadow" due to photon orbits ...
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12 votes
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Why is the ring in this simulation of Sgr A* off center?

The photon ring around a non-spinning Schwarzschild black hole is perfectly circular and centered on the black hole. The photon ring around a spinning Kerr black hole is almost circular (except for ...
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6 votes

Why is the ring in this simulation of Sgr A* off center?

The folder with the video this image comes from has a google docs document with captions and credits. The caption for this video reads "A video demonstrating the effect of inclination on the ...
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7 votes

Will the first Event Horizon Telescope image of the Milky Way's black hole Sgr A* just be another lumpy orange donut?

Yes. See today's press release from the Event Horizon Telescope. The image is remarkably similar to M87, but note that this a time-averaged composite over about 10 hours, because the emission from the ...
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