@HDE226868's answer to Why doesn't the black hole in the center of the Milky Way glow similarly to the famous M87 image? explains that neither black hole is orange and any Event Horizon Telescope images will be made at about 1 mm (~300 GHz). It goes on to point out that there's going to be far less emission from Sgr A*'s accretion disk than there is from that one. Of course ours is a lot closer, but it's not always active; unless a dust cloud wanders by and falls in. For more on that see answers to Why not take a picture of a closer black hole?

@RobJeffries' answer to How can the Event Horizon Telescope image Sgr A when it's not visible from all sites at one time?* points out that our disk might also vary in appearance over timescales of minutes rather than months, so it's going to be a new challenge in terms of data processing.

Question: Will the first Event Horizon Telescope image of the Milky Way's black hole be just another orange donut?

When all is said and done though, will the first EHT image of Sgr A* look pretty much like M87; a lumpy orange donut? I know there is an issue of inclination, but it won't look like it's edge-on because of the way light bends around, so I think it's necessary to consult a simulation. Another issue is the accretion source itself; will there be a disk or just spiraling filaments? Assuming the same wavelength and baseline there is a possibility of higher resolution, and the shorter timescale compared to M87 might be offset by a much sorter distance and therefore brightness.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.