Origin of the colour-magnitude relation of elliptical galaxies

Details Origin of the colour-magnitude relation of elliptical galaxies Origin of the colour-magnitude relation of elliptical galaxies

1996-09-24

arxiv.org/abs/astro-ph/9609160v1

Astron.Astrophys.320:41,1997

Astronomy and Astrophysics

Astrophysics

14 pages, 7 Postscript figures, uses l-aa.sty. Accepted for publication in Astronomy & Astrophysics

Scientific paper

Evolutionary models of elliptical galaxies are constructed by using a new population synthesis code. Model parameters are calibrated to reproduce the observed colour-magnitude (CM) relation of Coma ellipticals in $V-K$ vs. $M_{V}$ diagram. The SEDs are degenerated in stellar age and metallicity. An attempt is performed to break this degeneracy, by simulating evolution of the CM relation of elliptical galaxies, based on the two alternative interpretations; i.e., the CM relation reflects different mean stellar age or various stellar metallicity. A confrontation with the CM diagrams of E/S0 galaxies in the two distant clusters Abell 2390 ($z=0.228$) and Abell 851 ($z=0.407$) reinsures previous contentions that the CM relation is primarily a metallicity effect. This conclusion does not depend either on the model parameters, or on the cosmological parameters adopted.

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