Abell 1201: Detection of an Ultramassive Black Hole in a Strong Gravitational Lens · HackerPapers discussions

Abell 1201: Detection of an Ultramassive Black Hole in a Strong Gravitational Lens — mentioned by davorak

Wed, 29 Mar 2023 22:33:20 GMT

The 30 billion times the size of the sun is BBC making a mistake. It is 30 billion solar masses. Direct from durham [1] from the arxiv article [2]. techwiz137 pointed out[3] an existing known black hole, TON618, is 66 billion solar masses[4]. So the new find is large but not the largest ever found. [1]https://www.durham.ac.uk/news-events/latest-news/2023/03/lig... [2] https://arxiv.org/abs/2303.15514 [3] https://news.ycombinator.com/item?id=35360780 [4] https://en.wikipedia.org/wiki/TON_618

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Abell 1201: Detection of an Ultramassive Black Hole in a Strong Gravitational Lens — mentioned by croutonwagon

Wed, 29 Mar 2023 18:40:11 GMT

Here is a copy of the paper https://arxiv.org/pdf/2303.15514.pdf

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Abell 1201: Detection of an Ultramassive Black Hole in a Strong Gravitational Lens — mentioned by croutonwagon

Wed, 29 Mar 2023 18:39:40 GMT

I mean...There are others bigger than that with Phoenix A, but these are quasars and very visible, even if billions of LY away. https://en.wikipedia.org/wiki/Phoenix_Cluster#Supermassive_b... It seems the bigger tact is HOW it was discovered using gravitational lensing that may open up the ability to see otherwise "non-active" blackholes, even supermassive ones that otherwise dont have accretion discs or other forms of waves (radio, light or otherwise) that would make them directly observable. https://arxiv.org/pdf/2303.15514.pdf I am also not an astronomer, so dont take my word for it. Just…

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Abell 1201: Detection of an Ultramassive Black Hole in a Strong Gravitational Lens — mentioned by davorak

Wed, 29 Mar 2023 18:31:40 GMT

edit the bbc article got it wrong withe 30 billion times the size and it supposed to be 30 billion solar masses see [1] or the arxiv article [2] The bbc article says 30 billion times the size while TON618 is 66 billion times the mass. Wikipedia says TON618 has a Schwarzschild radius of 1,300 AU (390 billion km in diameter) vs teh sun's 1.3927 million km diameter. Which makes TON618 ~280k bigger than the sun. So if my math is right that makes the Ultramassive balck hole in the bbc article ~107k larger than TON618. edit give the R = 3M relation for black holes twice the radius means twice the…

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