NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T13:11:39 PDT
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For refcode 1970PASP...82...53D:
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Copyright by Astronomical Society of the Pacific. Reproduced by permission
1970PASP...82...53D Low-Dispersion Spectra of Galaxies. I. The Coma and Virgo Clusters A.G. Davis Philip Dudley Observatory State University of New York at Albany and N. Sanduleak Warner and Swasey Observatory Case Western Reserve Received Sept. 15, 1969 Abstract Low-dispersion objective prism (10,000 angstrom/mm) have been obtained of galaxies in the Coma and Virgo clusters. Composite color indices were derived from spectra which, when combined with magnitudes (Zwicky and Herzog 1963) allowed color-magnitude diagrams for clusters to be drawn. The differences between the diagrams for different clusters indicate that the method will prove useful in the study of the color distribution within clusters of galaxies. The main use of the spectral indices will be in the identification of the bluest and reddest galaxies which might warrant further study.
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