Mathematics – Logic
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.229..573l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 229, Dec. 15, 1987, p. 573-588.
Mathematics
Logic
20
Galactic Clusters, Galactic Evolution, Red Shift, Astronomical Photometry, Asymptotic Giant Branch Stars, Elliptical Galaxies, Inertial Reference Systems, Infrared Photometry, Radio Galaxies, Spiral Galaxies
Scientific paper
Optical and infrared photometric data on 53 galaxies in five clusters at 0.38 < z < 0.58 are described and analysed to produce the rest-frame (U-V) and (V-H) colours. The 36 red galaxies form a homogeneous population in each cluster. The colours of the 17 blue galaxies clearly distinguish between the normal spirals and the peculiar `A-type' galaxies found in these Butcher-Oemler clusters and suggest for the latter a substantial intermediate age 1-Gyr population as indicated by optical spectra. It is shown that inclusion of the evolution of the upper Asymptotic Giant Branch, which is usually neglected, into a simple evolutionary model can explain the observed evolution vector in the (U-V)/(V-H) plane. The observed evolution in the elliptical galaxies is sufficiently small that the implied ages of galaxies at z ≡ 0.45, relative to their present ages, are large enough to pose problems for cosmological models with q0 ≡ 0.5 and/or late epochs of galaxy formation.
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