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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, usingthe refurbished Arecibo telescope, leading to detection of 25 objects.These data, combined with the measurements available in the literature,provide the set of H i data for 94% of all late-type galaxies in theComa Supercluster with an apparent photographic magnitude mp≤ 15.7 mag. We confirm that the typical scale of H i deficiencyaround the Coma cluster is 2 Mpc, i.e. one virial radius. Comparing theH i mass function (HIMF) of cluster with non-cluster members of the ComaSupercluster we detected a shortage of high H i mass galaxies amongcluster members that can be attributed to the pattern of H i deficiencyfound in rich clusters.
| Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area.
The present catalog of 2096 galaxies within an area of about 140 sq degapproximately centered on the Virgo cluster should be an essentiallycomplete listing of all certain and possible cluster members,independent of morphological type. Cluster membership is essentiallydecided by galaxy morphology; for giants and the rare class of highsurface brightness dwarfs, membership rests on velocity data. While 1277of the catalog entries are considered members of the Virgo cluster, 574are possible members and 245 appear to be background Zwicky galaxies.Major-to-minor axis ratios are given for all galaxies brighter than B(T)= 18, as well as for many fainter ones.
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