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Star-forming galaxies in low-redshift clusters: Data and integrated galaxy properties

By C. F. Thomas, C. Moss, P. A. James, S. M. Bennett, A. Aragón-salamanca and M. Whittle

Abstract

Aims. This paper is a continuation of an ongoing study of the evolutionary processes affecting cluster galaxies. Methods. Both CCD R band and Hα narrow-band imaging was used to determine photometric parameters (mr, r24, Hα flux, and equivalent width) and derive star formation rates for 227 CGCG galaxies in 8 low-redshift clusters. The galaxy sample is a subset of CGCG galaxies in an objective prism survey (OPS) of cluster galaxies for Hα emission. Results. It is found that detection of emission-line galaxies in the OPS is 85%, 70%, and 50 % complete at the mean surface brightness values of 1.25×10 −19, 5.19×10 −20, and 1.76×10 −20 W m −2 arcsec −2, respectively, measured within the R band isophote of 24 mag arcsec −2 for the galaxy. Conclusions. The CCD data, together with matched data from a recent Hα galaxy survey of UGC galaxies within v≤3000 km s −1, will be used for a comparative study of R band and Hα surface photometry between cluster and field spirals

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