Abstract
Detailed studies of intermediate redshift (0.1 < z < 0.6) galaxies are changing our ideas of galaxy evolution. In rich clusters, extended star formation histories are found in some but not all early-type objects. Together with variable blue fractions, the activity observed suggests local processes dictate the appearance of an individual galaxy at high redshift and thus the concept of a generalised evolutionary correction can no longer be meaningful. In field samples, spectroscopic surveys indicate that if luminosity evolution is responsible for the steep galaxy number count relation, it must be of a luminosity-dependent form. Brief spectacular enhancements in star formation activity in otherwise low luminosity galaxies may explain the excess faint galaxies at B ~ 22. The similarity between the cluster and field activities is striking. The absence of high luminosity primeval galaxies may now be understood via the extended star formation observed in both samples, but a physical mechanism for the bursts of star formation seen remains to be found.
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Ellis, R.S. (1988). Distant Galaxies: Limits on Cosmology and Evolution. In: Kron, R.G., Renzini, A. (eds) Towards Understanding Galaxies at Large Redshift. Astrophysics and Space Science Library, vol 141. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2919-7_19
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DOI: https://doi.org/10.1007/978-94-009-2919-7_19
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