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The Butcher-Oemler effect in Abell 2317

Rakos, K. D. and Odell, Andrew P. and Schombert, J. M. (1997) The Butcher-Oemler effect in Abell 2317. Astrophysical Journal, 490 (1). pp. 194-201. ISSN 1538-4357


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Publisher’s or external URL: http://dx.doi.org/10.1086/304858


This paper presents deep narrowband photometry of the cluster A2317 (z = 0.211) carried out using the KPNO 4 m and Steward 2.3 m telescopes. Using rest frame Stromgren photometry, it is determined that A2317 has an unusually high fraction of blue galaxies (the Butcher-Oemler effect) for its redshift (f(B) = 0.35). We demonstrate that the ratio of blue to red galaxies has a strong dependence on absolute magnitude such that blue galaxies dominate the top of the luminosity function. Spectrophotometric classification shows that a majority of the red galaxies are E/SO's, with a small number of reddened starburst galaxies. Butcher-Oemler galaxies are shown to be galaxies with star formation rates typical of late-type spirals and to be irregular. Starburst systems were typically found to be on the lower end of the cluster luminosity function. In addition, blue galaxies are preferentially found in the outer edges of the cluster, whereas the red galaxies are concentrated in the cluster core.

Item Type: Article
Publisher’s Statement: © 1997 The American Astronomical Society. Published by IOP Publishing.
ID number or DOI: 10.1086/304858
Keywords: Evolution; Galaxies; galaxies, clusters, individual (A2317); galaxies, photometry galaxies, stellar content; LUMINOSITY; nuclei; PHOTOMETRY; rich clusters
Subjects: Q Science > QB Astronomy
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Physics and Astronomy
Date Deposited: 30 Sep 2015 17:46
URI: http://openknowledge.nau.edu/id/eprint/423

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