Sunday, 5 January 2020

optics - Black hole photography


I recently read an article that said that the event horizon telescope took a picture of a black hole (Sagitarius A*) and it will be presented on the 10th of April. I was wondering how this picture is taken and what a picture of a black hole even means?


The only explanation I could think of was that the telescope took pictures of the stars surrounding the black hole and then a sudden absence of stars pointed that a black hole is present.


Can anyone explain how black hole photos are taken or how does event horizon telescope work?



Answer



The project is using a network of radio telescopes to measure radio waves emitted by ionized matter in the accretion disk around the black hole, and by ionized matter in relativistic jets that are being ejected along the rotation axis.


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