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Date and Time of the Query: 2019-04-21 T13:47:09 PDT
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For refcode 1997A&A...320...41K:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1997A&A...320...41K Origin of the colour-magnitude relation of elliptical galaxies. Kodama T., Arimoto N. Received 11 June 1996/Accepted 13 September 1996 Abstract. 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. Key words: galaxies: elliptical - galaxies: evolution - galaxies: formation - galaxies: photometry - galaxies: stellar content
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