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The evolution of galaxies in clusters. I - ISIT photometry of C1 0024+1654 and 3C 295
Butcher, H.; Oemler, A., Jr.
AA(Kitt Peak National Observatory, Tucson, Ariz.)
Astrophysical Journal, Part 1, vol. 219, Jan. 1, 1978, p. 18-30. (ApJ Homepage)
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NASA/STI Keywords:
Astronomical Photometry, Galactic Clusters, Galactic Evolution, Galactic Structure, Graphs (Charts), Reference Stars, Spiral Galaxies, Tables (Data), Vidicons
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A description is presented of a project of two-color photometry of a number of distant clusters. The KPNO ISIT vidicon described by Lynds (1975) and Strom (1976) is used in the project. The first results reported are related to photometry studies of the two rich clusters, C1 0024+1654 (z = 0.39) and the cluster around 3C 295 (z = 0.46). It is shown that between one third and one half of the galaxies in C1 0024+1654 and the cluster around 3C 295 have the colors of spirals. If they are spirals, this population is similar to those of nearby spiral-rich clusters like the Hercules cluster (Oemler, 1974). Structurally, however, these clusters resemble, not clusters like Hercules, which are irregular and lack central concentration, but rather Coma and other cD clusters. It appears, therefore, that the dependence of content on form, which nearby clusters show, is not shown by these distant clusters observed at an earlier epoch.

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