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Spectroscopy of Distant Galaxies in Clusters

Published online by Cambridge University Press:  04 August 2017

Alan Dressler*
Affiliation:
Mount Wilson and Las Campanas Observatories of the Carnegie Institution of Washington

Extract

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Butcher and Oemler have reported that many clusters of galaxies at high redshift have enhanced populations of blue galaxies when compared to nearby clusters of similar type. Since this claim is based on broad-band colors alone, it is essential to obtain spectra of these blue objects to determine if they are actually cluster members. These spectra can also be used to provide a rough morphological classification of these objects that are too distant for detailed imaging with ground-based telescopes.

Type
Research Article
Copyright
Copyright © Reidel 1983