Hα surface photometry of galaxies in nearby clusters -: V.: The survey completion

We present the H alpha imaging observations of 273 late-type galaxies in the nearby rich galaxy clusters Virgo, A1367, Coma, Cancer, Hercules and in the Great Wall, carried out primarily with the 2.1 m telescope of the San Pedro Martir Observatory (SPM) and with the ESO/3.6 m telescope. We derived the H alpha+[NII] fluxes and equivalent widths. The H alpha survey reached completion for an optically selected sample of nearby galaxies in and outside rich clusters. Taking advantage of the completeness of the data set, the dependence of H alpha properties on the Hubble type was determined for late-type galaxies in the Virgo cluster. Differences in the gaseous content partly account for the large scatter of the H alpha EW within each Hubble-type class. We studied the radial distributions of the H alpha EW around Coma+ A 1367 and the Virgo clusters in two luminosity bins. Luminous galaxies show a decrease in their average H alpha EW in the inner similar to 1 virial radius, while low-luminosity galaxies do not show this trend.