Questions tagged [accretion-disk]
An accretion disk is the disk around a compact star that accumulates matter from e.g. a companion star by the Roche lobe overflow or stellar wind transfer.
8
questions
4
votes
1
answer
178
views
Why don’t black rings exist in 3+1 dimensions?
In higher dimensions black holes can take different forms. Besides spheroids, there are also “black rings” which have a toroidal event horizon. However, in our 3+1 dimension no black ring solution has ...
- 1,455
43
votes
3
answers
10k
views
Why isn't the circumferential light around the M87 black hole's event horizon symmetric?
After the revelation of the first black hole images, it seems there is a bias towards the south side. Is it because of measuring it from earth or is it something more fundamental in the understanding ...
- 3,366
9
votes
0
answers
350
views
Putting the importance of the blackhole image into perspective [closed]
The recent astonishing achievement of obtaining an actual image of a blackhole, resulted from a massive collaborative work using 8 different telescopes and the equally on par efforts in developing the ...
- 4,685
5
votes
2
answers
9k
views
How long does it take a black hole to eat a star?
I presume the answer is that it depends on the mass and size of the star and black hole and how they approach either other, but I was wondering if somebody could provide some rough bounds (e.g. hours ...
4
votes
2
answers
1k
views
Angular momentum in an accretion disk
I need to plot the time evolution of the total angular momentum in an accretion disc. This confuses me because I thought this should be constant, since angular momentum has to be conserved?
I'm given ...
- 41
4
votes
1
answer
211
views
Why can't friction in an accretion disk radiate away enough of the angular momentum do create inward spiral?
As almost every source that I'd found explains, it was a challenge for scientists to understand the mechanism by which the total angular momentum in the accretion disc was conserved, while taking the ...
- 485
2
votes
1
answer
238
views
Direction of Gamma Ray Bursts
After a black hole consumes a star, why do gamma ray bursts only shoot out perpendicular to the spinning accretion disk? Why do they not shoot out parallel to the disk?
0
votes
3
answers
931
views
Black hole accretion disk
Does matter in a black hole's accretion disk eventually fall into the black hole? If no new matter is added to disk, how long does it take or the black hole to consume the entire accretion disk?
- 39