Observations of galaxy M87 show how the black hole at its centre relates to a long-seen stream of superheated matter
Credit: R.-S. Lu and E. Ros , S.Dagnello wowed the world in 2019. Fresh data could now help to explain what exactly radio astronomers were looking at — including details of of the maelstrom it creates. And in an updated image, the black hole’s original orange ring now appears thinner, courtesy of a new way of analysing the existing data.The picture that graced the front pages of newspapers around the globe in 2019 showed the supermassive black hole at the centre of the galaxy M87, called M87* .
The black hole’s gravity bent rays of light to produce the ring shape, as expected from Albert Einstein’s general theory of relativity. But although astrophysicists had theories, there was no clear indication — on the basis of that image alone — as to the origin of the radiation. The most likely explanation was that the glow resulted from the same mechanism that causes a stupendously bright jet of superheated matter to protrude far out from the host galaxy.
Image credits: EHT Collaboration ; Medeiros et al. 2023 ; R.-S. Lu and E. Ros , S.Dagnello . Graphic assembled byThe original M87* image was blurry, and showed only the immediate vicinity of the black hole’s event horizon, the spherical surface that shrouds its interior. Any material that crosses the event horizon falls inwards, never to return. It was challenging to link the image to the larger-scale pictures of the jet.
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