Re: Quasar light variability linked to black hole mass (Forwarded)
- From: Joseph Lazio <jlazio@xxxxxxxxxxxxxxxxx>
- Date: 03 Feb 2007 06:57:23 -0500
"scu" == sciencecool@yahoo co uk <sciencecool@xxxxxxxx> writes:
[...]Quasar light variability linked to black hole mass
CHAMPAIGN, Ill. -- Quasars are some of the most luminous and
distant objects in the universe -- and appear to have something in
common with ordinary light bulbs, say researchers at the University
of Illinois at Urbana-Champaign and at the National Center for
Supercomputing Applications.
scu> Can you please let me know (i) How much energy is emitted is
scu> emitted by QUASAR.
Quasars have a range of luminosities. To quote a typical value, a
quasar's luminosity would be 10^{40} Watts.
scu> (ii) How much mass is annihilated in the process?
It is thought to be zero. Rather, the luminosity is the result of
matter falling into a supermassive black hole. Matter falling from a
long distance into a black hole gains an enormous amount of energy.
If only a fraction of this energy is extracted as light, there is
plenty to power a quasar.
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