–
•By definition – can’t see light from
black hole itself
•
•Can
see large amounts of energy released by falling material just before it crosses RS
•
•Can
see motion of nearby objects caused by gravity of black hole
•
•Example:
Like White Dwarf accretion disk but w/ black hole instead
–Gas
from red giant companion spills over towards black hole
–Gas
spirals in toward black hole, through accretion disk
•Gas
will be much hotter because it falls further, to very small RS
–Gas
will be moving at very high velocity
•Much
faster than with white dwarf since much closer (P2 µ a3)
•
•Signature
of black hole: Very high energy
release, very high velocity
–
•We will find MASSIVE black holes in centers of most
galaxies