Why an accretion disc? #
Posted Thursday 5th March 2009 12:27 GMT
Why does the matter, falling into a black hole, form an accretion disc?
Is it because most of the matter will come from the disc of the parent galaxy and so approach the black hole from those 'equatorial' directions?
The only other explanation I can think of is that the black hole is spinning. But if so, it would be hidden inside its own event horizon and so the approaching matter would not be able to 'see' the spin and be affected by it? The picture shown is, I am sure, an artists impression and seems to indicate that the black holes are spinning, clockwise as viewed from above.
Damn, I've started to think about it, this will last all day.
Any astronomers out there, please advise.


