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Credit: NASA and The Hubble Heritage Team (STScI/AURA) EHT measured the black hole's mass to be Producing an image from data from an array of radio telescopes requires much mathematical work. Only one side of the jet is seen because of relativistic effects; the jet is moving outward at nearly the speed of light and is pointed close to Earth resulting in an increase in brightness from relativistic beaming.
To give you an idea of how this works, you can think about the measurements we make from telescopes in the EHT as a bit like notes in a song. Two VLBI arrays that link radio dishes across the globe.
Angular resolution is the ability of the telescope to distinguish between narrowly separated objects. These accretion flows are extremely complex and turbulent. For example, even if many notes are playing, as long as there were some notes missing, it doesn’t have to be "Ice Ice Baby." Numerical models of them, therefore, play a key role in understanding black hole physics and in predicting what the EHT would see. Although at the time astronomers did not know that the source they had just discovered was in fact a black hole, it was given the name Sagittarius A* in 1982 because it was a bright and exciting source in the constellation Sagittarius. The larger the telescope, the smaller R is, and the better the angular resolution is. These images/animations were created by Prof. Andrea Ghez and her research team at UCLA and are from data sets obtained with the W. M. Keck Telescopes. Even though 4.3 million might seem like a lot, compared to other supermassive black holes at the centers of other galaxies it’s actually fairly small. (Please express your answer in units of solar radii.)

This technique allows the EHT to achieve an angular resolution of 20 micro-arcseconds—enough to read a newspaper in New York from a sidewalk café in Paris. The Event Horizon Telescope is attempting to image the supermassive black hole at the center of the Milky Way using Very Long Baseline Interferometry. The key scientific aim is to image the event horizon regions of the black hole at the center of our galaxy, Sgr A*, and at the center of the galaxy M87, thereby testing fundamental … The Event Horizon Telescope (EHT) is a telescopic array that encompasses the globe. Like Sgr A*, M87 harbors a supermassive black hole living at its center. However, since we are only collecting light at a few telescope locations, we are still missing some information about the black hole’s image. Although the accretion flow is optically thick in radio, the black hole shadow is visible in 1.3 mm, infrared, and x-ray. Even though there were still a lot of gaps in the notes near the end, it’s pretty amazing that your brain can fill in holes and you can start to make out the song. The first image of the Milky Way's supermassive black hole, Sagittarius A*, was expected to be produced in April 2017,Data collected on hard drives are transported by commercial freight airplanesThe Event Horizon Telescope Collaboration announced its first results in six simultaneous press conferences worldwide on April 10, 2019.The image also provided new measurements for the mass and diameter of M87*. The Event Horizon Telescope (EHT) has mapped the central compact radio source of the elliptical galaxy M87 at 1.3mm with unprecedented angular resolution. Most galaxies show very large scale jets of very fast moving plasma shooting away from the black hole. However, as we only have telescopes at a few locations, we must recognize the song being played with just a few notes.

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