The observations will help astronomers pin down the physics of the plasma around black holes. Astronomers have used the Global Millimeter VLBI Array (GMVA) to capture detailed images of M87*, revealing a larger, intense plasma ring and visual evidence of the black hole's accretion disk and relati
at the center of the nearby Messier 87 galaxy. The telescope’s laser-focused resolution revealed a very thin glowing ring around a dark center, representing the first visual of a black hole’s shadow.
For the first time, scientists could see that part of the black hole’s ring consists of plasma from a surrounding accretion disk — a swirling pancake of white-hot electrons that the team estimates is being heated to billions of degreesThis image shows the jet and shadow of the black hole at the centre of the M87 galaxy together for the first time.
Akiyama is part of an international team of astronomers who present the new images, along with their analysis, in a paper published on April 26 in the journalTo capture images of M87*, astronomers used a technique in radio astronomy known as very-long-baseline interferometry, or VLBI. When a radio signal passes by Earth, such as from a black hole’s plasma emissions, radio dishes around the world can pick up the signal.
To do so, the team involved two additional radio observatories: the Greenland Telescope to the north, and the Atacama Large Millimeter/submillimeter Array to the south. ALMA is an array of 66 radio dishes located in Chile’s Atacama Desert. MIT Haystack scientists, including Principal Research Scientist Lynn Matthews, worked to phase, or synchronize, ALMA’s dishes to work as one powerful and essential part of the GMVA network.
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