Fundamental Plane
	• Luminosities, surface brightness, central velocity distribution, (and others), are correlated, hence the term “fundamental plane.”  Ellipticals populate a plane in parameter space.  BIG area of research – very useful tool and helps us understand galaxies. • Faber & Jackson (1976) is a classic in this area (you might want to look up and read this one): • L ~ σx where x ≈4 • So, get dispersion from spectrum, get luminosity, and with magnitude get distance!