Feedback and late star formation in elliptical galaxies |
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| Authors: | Ignacio Ferreras Evan Scannapieco Joseph Silk |
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| Institution: | (1) Physics Dept., Denys Wilkinson Bldg, Keble Road, Oxford, OX1 3RH, U.K;(2) Osservatorio Astrofisico di Arcetri, 50125 Firenze, Italy |
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| Abstract: | We present a one-zone model of star formation in elliptical galaxies that includes thermal feedback from supernovae and a
temperature dependent star formation efficiency. The modulation of feedback with the total mass results in the triggering
of late episodes of star formation in low-mass galaxies. These small `bursts' can occur as late as at redshifts z ∼ 0.5 but they do not change significantly the optical and NIR color-magnitude relation (CMR) of cluster galaxies, both locally
and out to moderate redshifts, in agreement with the observations. However, they introduce a large scatter at the faint end
of the NUV-Optical CMR, as recently found in cluster Abell 851 (z = 0.41).
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | galaxies: elliptical and lenticular cD galaxies: evolution galaxies: stellar content |
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