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Star-forming galaxies in low-redshift clusters: data and integrated galaxy properties^*

¹ Astrophysics Research Institute, Liverpool John Moores University, Birkenhead CH41 1LD, UK e-mail: cft@astro.livjm.ac.uk
² Royal Observatory, Greenwich, London SE10 9NF, UK
³ Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
⁴ School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD, UK
⁵ Department of Astronomy, University of Virginia, Charlottesville, VA 22903, USA

Received: 7 October 2007
Accepted: 23 April 2008

Abstract

Aims.This paper is a continuation of an ongoing study of the evolutionary processes affecting cluster galaxies.

Methods.Both CCDR band and Hα narrow-band imaging was used todetermine photometric parameters (m_r,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 galaxiesin an objective prism survey (OPS) of cluster galaxies for Hα emission.

Results.It is found that detection ofemission-line galaxies in the OPS is 85%, 70%, and 50% complete atthe 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 theR band isophote of 24 mag arcsec^-2 for the galaxy.

Conclusions.The CCD data, together withmatched data from a recent Hα galaxy survey of UGC galaxieswithinv≤ 3000 km s^-1, will be used fora comparative study ofR band and Hα surface photometry betweencluster and field spirals.