Questions tagged [accretion-discs]
Questions regarding disks of gas, dust, and plasma around a central object, such as a black hole, which takes in the matter.
8
questions with no upvoted or accepted answers
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82 views
Why would a black hole have a disk, but not emit x-rays?
There's a recent paper in Nature about LB-1, a B-class star orbiting a massive black hole.
I don't understand how these two parts of the paper can be reconciled. On page 2, the authors argue that the ...
4
votes
0answers
35 views
Is Beta Lyrae still thought to be losing mass in a spiral outflow?
In the famous 1960 painting by Chesley Bonestell, Beta Lyrae is depicted with a glowing spiral trail of matter emanating from the binary stars. I'm wondering if that's still thought to be a ...
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+100
How does gas in accretion disks of supermassive black holes create orbital torques on smaller black holes within the disks causing them to migrate?
This answer to What enhances the capture and merge rates of pairs of small black holes orbiting around supermassive black holes? links to Migration Traps in Disks Around Supermassive Black Holes which ...
3
votes
0answers
75 views
Torus of the AGN
How much do we know about the structure of the torus surrounding the galactic nuclei? Is the shape defined or still under speculations? And are there different structures for this torus possible i.e., ...
2
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0answers
41 views
Why are pseudo-Newtonian potentials used in studies of accretion processes around black holes?
In accretion processes around black holes, pseudo-Newtonian potentials are defined for the the black hole geometry. For examples, the potentials defined by Paczynski-Wiita and Artemova et al. for ...
2
votes
0answers
77 views
Astrophysical Jet Size?
I am wondering about what is the estimated size of astrophysical jet that shoots out from a black hole, I don’t know if it is determined by the size of a black hole.
What would classify a black hole ...
2
votes
0answers
245 views
Angular momentum in planetary disk formation
Reading about the formation of planetary disks, one of the major problems, it seems like, is the evacuation of angular momentum. Aparently planets can't form with the amount o angular momentum the ...
1
vote
0answers
38 views
Causes of emission of accretion disk
As far as I can see, there are two main sources for the emission of energy from an accretion disk:
release of gravitational potential energy of the infalling matter;
friction from differential ...
