Origin of the colour-magnitude relation of elliptical galaxies

Nobuo Arimoto (Institute of Astronomy; Tadayuki Kodama; Univ. of Tokyo)

Origin of the colour-magnitude relation of elliptical galaxies

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arxiv astro-ph/9609160 v1 pith:YE5OTTMC submitted 1996-09-24 astro-ph

Origin of the colour-magnitude relation of elliptical galaxies

Tadayuki Kodama , Nobuo Arimoto (Institute of Astronomy , Univ. of Tokyo) This is my paper

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keywords relationgalaxiesellipticalmetallicityparametersstellarabellcolour-magnitude

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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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