on 7/9/02 11:12 AM, SuerthP_at_andersonnews.com at SuerthP_at_andersonnews.com
wrote:
>
> based on some info i gleaned (i think) from sci-am and mr. hawking, they
> apparently (as i inguired earlier) evaporate from expulsion of xrays along
> their rotational axes...
>
You're talking two different things. Three actually...
1) The x-rays come from the material on the inner portion of the accretion
disk. The material there is so hot that the peak of the thermal radiation
is in the x-ray. The x-rays aren't really aligned with the axes, although
if one is looking through the accretion disk edge-on, it may be pretty tough
to see all the x-rays.
2) Stuff flying off along the rotational axes are jets of matter. The
details of the process aren't worked out, but has to do with the magnetic
fields that would naturally exist in the plasma of the accretion disk.
3) "Evaporation" is due to Hawking radiation. At the quantum level, there
are particle-antiparticle pairs popping into/out of existence all the time.
When this happens at the very edge of the event horizon, although these
pairs are generally termed virtual, one of the pair can end up inside the
event horizon. The other is left to escape the vicinity as a real particle.
At a large distance from the BH, a flux of these particles is seen to be
coming from the BH. Since these particles carry mass and energy, in order
to conserve mass and energy, the BH must lose both mass and energy. Taken
to it's logical conclusion, the BH must eventually go PFFFT and be gone.
(Note: no one has actually calculated the exact sound a BH will make when it
evaporates... :-) )
- Eric.
--Eric Strobel (fyzycyst_at_NOSPAM^mailaps.org)
===================================================================== There is never a single right solution. There are always multiple wrong ones, though. =====================================================================
-- Read the List FAQ/Etiquette: http://www.newtontalk.net/faq.html Read the Newton FAQ: http://www.guns-media.com/mirrors/newton/faq/ This is the NewtonTalk mailing list - http://www.newtontalk.net
This archive was generated by hypermail 2.1.2 : Thu Aug 01 2002 - 06:02:17 EDT