Mathematics – Logic
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270....7d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 7-19.
Mathematics
Logic
494
Astronomical Spectroscopy, Galactic Clusters, Galactic Nuclei, Red Shift, Stellar Evolution, Active Galaxies, Balmer Series, Color, Data Acquisition, Data Reduction, Seyfert Galaxies, Spiral Galaxies
Scientific paper
The authors present 20 new spectra of objects in the field of the cluster of galaxies 3C 295 obtained with a new multislit technique. Together with previous data for this cluster, they now have good-quality spectra of 26 objects and redshifts of 23 of these. The field is heavily contaminated by a foreground cluster of galaxies. Less than half of the blue galaxies cataloged by Butcher and Oemler in this cluster are actually cluster members. The color distribution in the cluster is not unusual when compared with nearby clusters of similar morphological type. On the other hand, the six blue objects that are members of 3C 295 are all very unusual for present-day clusters, including three galaxies with active nuclei and three galaxies which have evidence for large bursts of star formation. If these data are representative, they indicate a strong evolution for these types of systems over the last 5×109 years.
Dressler Alan
Gunn James E.
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