Origin of the colour-magnitude relation of elliptical galaxies.
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) re-insures 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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 1997
- DOI:
- 10.48550/arXiv.astro-ph/9609160
- arXiv:
- arXiv:astro-ph/9609160
- Bibcode:
- 1997A&A...320...41K
- Keywords:
-
- GALAXIES: ELLIPTICAL;
- GALAXIES: EVOLUTION;
- GALAXIES: FORMATION;
- GALAXIES: PHOTOMETRY;
- GALAXIES: STELLAR CONTENT;
- Astrophysics
- E-Print:
- 14 pages, 7 Postscript figures, uses l-aa.sty. Accepted for publication in Astronomy &