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The article is about the Abell 1201 black hole. The paper referenced in the article is paywalled though[0]. And Wikipedia has a List of most massive black hole

by hpb42 4y ago

The article is about the Abell 1201 black hole. The paper referenced in the article is paywalled though[0]. And Wikipedia has a List of most massive black holes[1]. Quite fascinating, although the list is about their masses and not their sizes. I'm not an expert on the subject, but the Abell 1201 black hole and the others in the list are near the theoretical limit of a black hole's mass (5 * 10^10 solar masses). [0] https://academic.oup.com/mnras/article-abstract/521/3/3298/7085506?redirectedFrom=fulltext&login=false https://academic.oup.com/mnras/article-abstract/521/3/3298/7... [1] https://en.wikipedia.org/wiki/List_of_most_massive_black_holes https://en.wikipedia.org/wiki/List_of_most_massive_black_hol...

croutonwagon 4y ago
Here is a copy of the paper https://arxiv.org/pdf/2303.15514.pdf https://arxiv.org/pdf/2303.15514.pdf
lcnPylGDnU4H9OF 4y ago
> their masses and not their sizes Do black holes even differ in density? I would have thought all black holes have a constant and consistent density but I don't think I've ever really considered it before.
- sclarisse 4y ago
  They do! Or at least, the volume bounded by the event horizon has variable density. The small ones are much denser, and the large ones are much less dense. (Whatever the degenerate matter at the center is like, that’s another matter.)
- Iwan-Zotow 4y ago
  Sure. Supergiant BHs are less dense than water
sclarisse 4y ago
The size of a black hole’s event horizon is pretty much directly correlated to its mass; I think the only thing that really modifies it in practice is very fast rotation. (Remember, it’s a phenomenon of gravity, not a physical object. The physical stuff inside is just some really intense matter squeezed together in ways that might be interesting, if they were observable.)
- Andrew_nenakhov 4y ago
  My favourite theory is that stuff inside black holes is more universes like ours, which is also inside the black hole.

by hpb42 4y ago

croutonwagon 4y ago

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

lcnPylGDnU4H9OF 4y ago

> their masses and not their sizes Do black holes even differ in density? I would have thought all black holes have a constant and consistent density but I don't think I've ever really considered it before.

sclarisse 4y ago
They do! Or at least, the volume bounded by the event horizon has variable density. The small ones are much denser, and the large ones are much less dense. (Whatever the degenerate matter at the center is like, that’s another matter.)
Iwan-Zotow 4y ago
Sure. Supergiant BHs are less dense than water

sclarisse 4y ago

The size of a black hole’s event horizon is pretty much directly correlated to its mass; I think the only thing that really modifies it in practice is very fast rotation. (Remember, it’s a phenomenon of gravity, not a physical object. The physical stuff inside is just some really intense matter squeezed together in ways that might be interesting, if they were observable.)

Andrew_nenakhov 4y ago
My favourite theory is that stuff inside black holes is more universes like ours, which is also inside the black hole.