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I don't get it. There are black holes that have millions of sun masses. The current theory is that these were formed by many consecutive mergers. What then make

I don't get it. There are black holes that have millions of sun masses. The current theory is that these were formed by many consecutive mergers. What then makes this 225 sun mass merger so large that it shouldn't exist?

berkes 1y ago
Just guessing, but maybe the common situation is that one ever growing black hole absorbes small ones? But that two of these large ones merging "should not happen"?
daedrdev 1y ago
There are no medium sized bkack holes. As far as we look back in time with james webb,the largest are already there.
DrBazza 1y ago
Large mass stars are very, very few in number, and have short lifetimes, so collapse into black holes (if it happens), and then mergers are vanishingly small. 225 solar masses black holes are in the realms of unlikely if only had that information. https://en.wikipedia.org/wiki/List_of_most_massive_stars https://en.wikipedia.org/wiki/List_of_most_massive_stars Then again, the universe is really big and to paraphrase Pratchett, million-to-one chances happen nine times out of ten. https://en.wikipedia.org/wiki/Phoenix_Cluster#Supermassive_black_hole https://en.wikipedia.org/wiki/Phoenix_Cluster#Supermassive_b... "Such a high mass may place it into a proposed category of stupendously large black holes (SLABs), black holes that may have been seeded by primordial black holes with masses that may reach 100 billion M or more, larger than the upper maximum limit for at least luminous accreting black holes hosted by disc galaxies of about 50 billion M[12]" (which comes from a paper from one of my old lecturers). If we accept that primordial black holes do indeed exist (the evidence against, is, I believe that they should be evaporating about now, but are as yet unobserved), there must therefore be a weight distribution of those, which means there are probably other 'solar mass' 'seeded' black holes lurking, that were never created by stellar collapse.
- GoblinSlayer 1y ago
  To make a stupendously large black hole, you only need a stupendously large amount of mass in the galactic core, no need for primordial black holes. Coincidentally Phoenix galaxy is stupendously heavy.

berkes 1y ago

Just guessing, but maybe the common situation is that one ever growing black hole absorbes small ones? But that two of these large ones merging "should not happen"?

daedrdev 1y ago

There are no medium sized bkack holes. As far as we look back in time with james webb,the largest are already there.

DrBazza 1y ago

Large mass stars are very, very few in number, and have short lifetimes, so collapse into black holes (if it happens), and then mergers are vanishingly small. 225 solar masses black holes are in the realms of unlikely if only had that information. https://en.wikipedia.org/wiki/List_of_most_massive_stars https://en.wikipedia.org/wiki/List_of_most_massive_stars Then again, the universe is really big and to paraphrase Pratchett, million-to-one chances happen nine times out of ten. https://en.wikipedia.org/wiki/Phoenix_Cluster#Supermassive_black_hole https://en.wikipedia.org/wiki/Phoenix_Cluster#Supermassive_b... "Such a high mass may place it into a proposed category of stupendously large black holes (SLABs), black holes that may have been seeded by primordial black holes with masses that may reach 100 billion M or more, larger than the upper maximum limit for at least luminous accreting black holes hosted by disc galaxies of about 50 billion M[12]" (which comes from a paper from one of my old lecturers). If we accept that primordial black holes do indeed exist (the evidence against, is, I believe that they should be evaporating about now, but are as yet unobserved), there must therefore be a weight distribution of those, which means there are probably other 'solar mass' 'seeded' black holes lurking, that were never created by stellar collapse.

GoblinSlayer 1y ago
To make a stupendously large black hole, you only need a stupendously large amount of mass in the galactic core, no need for primordial black holes. Coincidentally Phoenix galaxy is stupendously heavy.