Other
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..841h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Sept. 1991, p. 841-863.
Other
16
Galactic Structure, Red Shift, Spatial Distribution, Virgo Galactic Cluster, Spiral Galaxies, Universe, X Ray Sources
Scientific paper
The present study investigates the 3D distribution of galaxies in a region surrounding the chain of galaxies in the NGC 5846 group by subjective and objective tests for clustering. The results of an automated search, in which a percolation algorithm is applied to a redshift sample complete in magnitude not greater than 14.9, are compared with those of the subjective impressions. At a number density enhancement of 20 over the mean background, eight large groups which were not affected by incompleteness at very low declinations are identified. Four of these groups - the Virgo II cloud, the NGC 5846 group, and groups 139 and 148 from the list of GH - are nearby. Virgo III is loose and irregular whereas NGC 5846 is dense and symmetric. The other two groups are small compact clumps. The conclusions are in agreement with a study by Tully (1982) that these four nearby groups form a prolate cloud with an overall density contrast over the mean of about 10, and that this cloud lies out of the supergalactic plane and points toward the Virgo cluster.
Giovanelli Riccardo
Haynes Martha P.
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