Funny thought..

umbabrahattasil

U
I for one agree with many others that certain black holes need accretion disks. Then I thought about Sag A* needing one, and laughed because, isn't Sag A*'s accretion disk already in place? As in...isn't Sag A*'s accretion disk, the galaxy itself? Ever swirling and feeding the middle?

Yes, I realize how absolutely insane and chaotic beyond comprehension and intense it must be near the center IRL, and that's not represented when jumped into SAG A*. I get it.

Just thought it was funny that when it comes to Accretion Disks, SAG A* in a way, technically already has one? It's called the Milky Way. [big grin]
 
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IndigoWyrd

IndigoWyrd
umbabrahattasil said:
I for one agree with many others that certain black holes need accretion disks. Then I thought about Sag A* needing one, and laughed because, isn't Sag A*'s accretion disk already in place? As in...isn't Sag A*'s accretion disk, the galaxy itself? Ever swirling and feeding the middle?

Yes, I realize how absolutely insane and chaotic beyond comprehension and intense it must be near the center IRL, and that's not represented when jumped into SAG A*. I get it.

Just thought it was funny that when it comes to Accretion Disks, SAG A* in a way, technically already has one? [big grin]
Click to expand...

And this is why we don't have accretion disks - because we already have the biggest one of all.
 

ibmalone

I
Not exactly. Sag A* is very big, about 4M solar masses, but the Milky Way is about 1 trillion solar masses, about 250 thousand times as much. Supermassive black holes are involved in galaxy formation, but it's only a small part of the gravitational binding of the Milky Way. What defines an accretion disc is that the material is falling inwards, to do that it has to lose angular momentum which happens through turbulence or viscosity, which puts limits on their size. I'm not sure it's actually confirmed our galaxy's supermassive black hole has an accretion disc. Supposedly there was a near miss of a gas cloud oberved fairly recently, in which nothing happened.

I think the biggest known ones are possibly in things called Seyfert galaxies, https://en.wikipedia.org/wiki/Seyfert_galaxy where they can get into thousand light year territory and are responsible for very bright cores.
 

voidwalker

voidwalker
Accretion disks don't always form around black holes, only the ones that are 'feeding'. If the Sag A* was feeding, we'd all be in a spot of bother.
 

BinakAlgo

BinakAlgo
Do black holes have cones? Has anyone tried to supercharge their FSD on them to see if they reach Andromeda Galaxy?
 
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