Completing H I observations of galaxies II . The Coma Supercluster

High sensitivity 21-cm H i line observations, with an rms noise level of ∼ 0.5 mJy, were made of 35 spiral galaxies in the Coma Supercluster, using the refurbished Arecibo telescope, which resulted in the detection of 25 objects. These data, combined with the measurements available from the literature, provide the set of H i data for 94 % of all late-type galaxies in the Coma Supercluster with an apparent photographic magnitude mp ≤ 15.7 mag. We confirm that the typical scale of H i deficiency around the Coma cluster is 2 Mpc, i.e. one virial radius. Comparing the H i mass function (HIMF) of cluster with non-cluster members of the Coma Supercluster we detect a shortage of high H i mass galaxies among cluster members that can be ascribed to the pattern of H i deficiency found in rich clusters.