Completing HI observations of galaxies II. The Coma Supercluster

TL;DR

This study presents high-sensitivity HI line observations of 35 spiral galaxies in the Coma Supercluster, detecting 25, and combines data to analyze HI deficiency and the HI mass function in the cluster environment.

Contribution

It provides new high-sensitivity HI data for most late-type galaxies in the Coma Supercluster and analyzes HI deficiency scales and the HI mass function in cluster versus non-cluster galaxies.

Findings

HI deficiency scale around Coma is about 2 Mpc

Cluster galaxies show a shortage of high HI mass objects

Data confirms HI deficiency pattern in rich clusters

Abstract

High sensitivity 21-cm HI line observations, with an rms noise level of \sim 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 HI data for 94% of all late-type galaxies in the Coma Supercluster with an apparent photographic magnitude m_p <15.7 mag. We confirm that the typical scale of HI deficiency around the Coma cluster is 2 Mpc, i.e. one virial radius. Comparing the HI mass function (HIMF) of cluster with non-cluster members of the Coma Supercluster we detect a shortage of high HI mass galaxies among cluster members that can be ascribed to the pattern of HI deficiency found in rich clusters.