Image Details
Caption: Fig. 20.
﹩R-K﹩ color as a function of redshift. Symbols are as in Fig. 2. The five evolutionary tracks correspond to an unreddened QSO, with ﹩L=L^{\star }_{B}﹩, and unreddened elliptical, Sbc, Scd, and irregular ﹩L^{\star }﹩ galaxies from the Coleman et al. (1980) SED templates.
© 2004. The American Astronomical Society. All rights reserved. Printed in U.S.A.