13:44supplementary video · Kurzgesagt on YouTube ↗
science & techanalysisThe Conversation (Australia)
Is this iconic black hole image accurate? New study delivers an independent result
The first picture of a black hole, released in 2019, shows the glowing ring around the supermassive black hole at the centre of galaxy M87, 55 million light-years away. Taking it meant linking radio telescopes across the planet into one Earth-sized instrument, comparable to photographing a doughnut on the Moon. Because the telescope array is sparse, the image has to be reconstructed from incomplete data, and some scientists doubted the ring's fine details. An Australian team has now re-analysed the original data with a new method that uses triplets of telescope signals, which cancels errors from the atmosphere and instruments. Their independent result confirms the ring and adds a fresh view of its structure.
Iconic results get tested by independent methods, and this one held up. That strengthens the evidence that galaxies host supermassive black holes shadowed exactly as Einstein's general relativity predicts.
The 2019 image's black hole is roughly 6.5 billion times the mass of the Sun.
background
Messier 87 (also known as Virgo A or NGC 4486, generally abbreviated to M87) is a supergiant elliptical galaxy in the constellation Virgo that contains several trillion stars. One of the largest and most massive galaxies in the local universe, it has a large population of globular clusters—about 15,000 compared with the 150–200 orbiting the Milky Way—and a jet of energetic plasma that originates at the core and extends at least 1,500 parsecs (4,900 light-years), traveling at a relativistic speed. It is one of the brightest radio sources in the sky and a popular target for both amateur and professional astronomers.
From Wikipedia: Messier 87 (CC BY-SA 4.0) ↗ · text CC BY-SA 4.0The Conversation
