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2006MNRAS.367..339J - Mon. Not. R. Astron. Soc., 367, 339-348 (2006/March-3)
Optical/near-infrared colours of early-type galaxies and constraints on their star formation histories.
JAMES P.A., SALARIS M., DAVIES J.I., PHILLIPPS S. and CASSISI S.
Abstract (from CDS):
The methods developed here are applied to samples of nearby early-type galaxies with high-quality aperture photometry in the literature. A sample of bright field and Virgo cluster elliptical galaxies is found to exhibit a range of luminosity-weighted mean ages from 3 to 14Gyr, with a mean of ∼8Gyr, independent of environment, and mean metallicities at or just above the solar value. Colour gradients are found in all of the galaxies studied, in the sense that central regions are redder. Apart from two radio galaxies, where the extreme central colours are clearly driven by the active galactic nucleus, and one galaxy which also shows a radial age gradient, these colour changes appear consistent with metallicity changes at a constant mean age. Finally, aperture data for five Virgo early-type dwarf galaxies show that these galaxies appear to be shifted to lower mean metallicities and lower mean ages (range 1-6Gyr) than their higher luminosity counterparts.
Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s): galaxies: clusters: individual: Virgo - galaxies: dwarf - galaxies: elliptical and lenticular - galaxies: stellar content
Simbad objects: 24
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