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Spectroscopy of galaxies in distant clusters. III - The population of CL 0024 + 1654
Dressler, A.; Gunn, J. E.; Schneider, D. P.
AA(Mount Wilson and Las Campanas Observatoires, Pasadena, CA), AB(Princeton University, NJ), AC(Palomar Observatory, Pasadena, CA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 1, 1985, p. 70-80. (ApJ Homepage)
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NASA/STI Keywords:
Absorption Spectra, Astronomical Spectroscopy, Emission Spectra, Galactic Clusters, Galactic Nuclei, Red Shift, Active Galactic Nuclei, Broadband, Hubble Constant, Spiral Galaxies, Starburst Galaxies, Stellar Evolution
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The authors present the results of a spectroscopic study of 38 objects in the field of the very rich, concentrated cluster Cl 0024+1654 at a redshift of z = 0.391. All of the red galaxies and 14 of the 22 blue objects are found to be cluster members. The spectra of the blue cluster members are very similar to those of low-redshift spirals, suggesting that these distant galaxies are also undergoing protracted periods of star formation. The cluster contains at least two AGN galaxies, lending some support to the idea that Seyfert galaxies have undergone significant evolution since z ≈ 0.5. Imaging a cluster through a narrow-band filter centered at redshifted [O II] has proved a successful way to find candidate AGNs and star-forming spirals over the entire field, providing a significant gain in efficiency. A model that includes a predisposition for earlier Hubble types in dense clusters can account for many of the available data.

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