EDP Sciences
Free access
Volume 486, Number 3, August II 2008
Page(s) 755 - 761
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20078806
Published online 04 June 2008

A&A 486, 755-761 (2008)
DOI: 10.1051/0004-6361:20078806

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

C. F. Thomas1, 2, C. Moss1, P. A. James1, S. M. Bennett3, A. Aragón-Salamanca4, and M. Whittle5

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

Aims. This paper is a continuation of an ongoing study of the evolutionary processes affecting cluster galaxies.
Methods. Both CCD R band and H$\alpha$ narrow-band imaging was used to determine photometric parameters (mr, r24, H$\alpha$ 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 H$\alpha$ 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 $\times$ 10-19, 5.19 $\times$ 10-20, and 1.76 $\times$ 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 H$\alpha$ galaxy survey of UGC galaxies within v $\le$ 3000 km s-1, will be used for a comparative study of R band and H$\alpha$ surface photometry between cluster and field spirals.

Key words: galaxies: clusters: general -- galaxies: evolution -- galaxies: interactions

© ESO 2008