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2004MNRAS.349.1381P - Mon. Not. R. Astron. Soc., 349, 1381-1396 (2004/April-3)
Ages and metallicities of Hickson compact group galaxies.
PROCTOR R.N., FORBES D.A., HAU G.K.T., BEASLEY M.A., DE SILVA G.M., CONTRERAS R. and TERLEVICH A.I.
Abstract (from CDS):
Variations are seen in the ranges and average values of age, metallicity and α-element abundance ratios for galaxies in different environments. Age distributions support the hierarchical formation prediction that field galaxies are on average younger than their cluster counterparts. However, the ages of HCG galaxies are shown to be more similar to those of cluster galaxies than those in the field, contrary to the expectations of current hierarchical models. A trend for lower velocity dispersion galaxies to be younger was also seen. This is again inconsistent with hierarchical collapse models, but is qualitatively consistent with the latest N -body smoothed particle hydrodynamics models based on monolithic collapse in which star formation continues for many Gyr in low-mass haloes.
Abstract Copyright: 2004 RAS
Journal keyword(s): galaxies: abundances - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: formation - galaxies: interactions
Nomenclature: Table 1: [PFH2004] HCG 16X, [PFH2004] HCG 22X, N=2.
Simbad objects: 50
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