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| Paper: |
Mass-to-Light Ratios and the Star Formation History of Cluster Early-Type Galaxies |
| Volume: |
240, Gas and Galaxy Evolution: A Conference in Honor of the 20th Anniversary of the VLA |
| Page: |
628 |
| Authors: |
Ferreras, I.; Silk, J. |
| Abstract: |
The slope of the correlation between mass-to-light ratios and masses in elliptical galaxies -- closely related to the tilt of the fundamental plane with respect to the expectation from the virial theorem -- is explored with a simple model which reduces the stellar evolution to four parameters: the timescale and epoch of infall, the fraction of ejected gas in outflows, and the star formation efficiency. A range in the last two parameters can explain the color-magnitude relation, but they are degenerate even with respect to the predictions of the color-magnitude relation at moderate redshifts. It is the evolution with redshift of the slope between mass-to-light ratios and masses which can break this degeneracy, thereby disentangling the effects of age and metallicity. |
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