Black Holes – detection
	• 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  a3) • Signature of black hole:  Very high energy release, very high velocity • We find MASSIVE black holes in centers of most galaxies