Star-forming galaxies in low-redshift clusters: data and integrated galaxy properties*
Astrophysics Research Institute, Liverpool John Moores University, Birkenhead CH41 1LD, UK e-mail: email@example.com
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
Accepted: 23 April 2008
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.
Key words: galaxies: clusters: general / galaxies: evolution / galaxies: interactions
© ESO, 2008