WIDE-FIELD H alpha SURVEY OF NEARBY CLUSTERS OF GALAXIES: DATA

We present the results of a wide-field H alpha imaging survey of eight nearby (z = 0.02-0.03) Abell clusters. We have measured H alpha fluxes and equivalent widths for 465 galaxies, of which 360 are new detections. The survey was designed to obtain complete emission-line-selected inventories of star-forming galaxies in the inner regions of these clusters, extending to star formation rates below 0.1 M sub([middot in circle]) yr super(-1). This paper describes the observations, data processing, and source identification procedures, and presents an H alpha and R-band catalog of detected cluster members and other candidates. Future papers in the series will use these data to study the completeness of spectroscopically based star formation surveys, and to quantify the effects of cluster environment on the present-day populations of star-forming galaxies. The data will also provide a valuable foundation for imaging surveys of redshifted H alpha emission in more distant clusters.