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vitus988
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How is it formed? How do particles move on it?
bcrowell said:The accretion disk is simply the cloud of matter (if any) falling into the black hole. It forms a disk for the same reason that, e.g., our solar system is planar: conservation of angular momentum. The particles move along trajectories that differ from Keplerian orbits in two ways: (1) the closer you get to the event horizon, the bigger the relativistic corrections to Newtonian gravity, and (2) they collide with one another sometimes. The collisions are the reason the accretion disk is so hot.
vitus988 said:I am new to the concept or the field. I've read wiki about it but still confused. I would like to get a more detailed theoretical view but don't know where to start. Any book or paper for recommendation?
bcrowell said:What's the level of your background in physics, and specifically relativity?
vitus988 said:I am an senior year undergraduate majored in physics in China.
I took an introduction course to general relativity for undergraduate. Knowing some basics about BH. I am trying to get to a deeper insight through English textbooks or papers.
bcrowell said:That's good -- it sounds like you have a strong background. Can you be more specific about what point is causing you difficulty right now? Do you just want to learn more about black holes, or is there something related to accretion disks that you don't understand?
I think they're simply observed directly. They also help to explain the planar nature of the solar system, and they arise naturally due to conservation of angular momentum.vitus988 said:It contains much information, however, without further explanation. How the accretion disk firstly proposed?
We look through a telescope and see accretion disks.On wiki it is only :" In the 1940s, models were first derived from basic physical principles." Then there is "In order to agree with observations". What are the observations?
An accretion disk is a disk-shaped structure of gas and dust that surrounds a black hole. It forms when matter from a nearby star or gas cloud is pulled into the gravitational field of the black hole.
An accretion disk forms when matter from a nearby source is pulled into the strong gravitational field of the black hole. As the matter gets closer to the black hole, it begins to spin around it, forming a disk shape.
An accretion disk is primarily made up of gas and dust. The gas can be in various forms, such as hydrogen, helium, and other elements. The dust is made up of small particles, such as carbon, silicon, and iron.
An accretion disk plays a critical role in the formation of a black hole. As the matter in the disk spirals towards the black hole, it heats up and emits radiation. This radiation carries away angular momentum, allowing the matter to get closer and closer to the black hole until it eventually crosses the event horizon and becomes part of the black hole.
The intense radiation emitted from an accretion disk can have a significant impact on the surrounding environment. It can heat up nearby gas and dust, causing it to glow and creating bright emissions of light. The strong magnetic fields within the disk can also produce powerful jets of material that shoot out from the poles of the black hole.