Mathematics – Probability
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..724t&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 724-742.
Mathematics
Probability
92
Cosmology, Galactic Clusters, Galactic Structure, Red Shift, Frequency Distribution, Interstellar Extinction, Luminosity, Probability Distribution Functions, Spiral Galaxies, Velocity Distribution
Scientific paper
The almost complete sample of more than 150 redshifts for galaxies brighter than mp = 15.8 mag in a 28 square degree field in Hercules by Tarenghi et al. is used to examine the cosmography of a 60,000 cubic Mpc conical volume of space. It contains a supercluster of Abell clusters with a depth of about 100 Mpc, a vacant 'void' also with a depth of about 100 Mpc, and a structure wider than 12 Mpc which could be part of a more extensive system of small groups of galaxies. Properties of individual rich clusters in the Hercules supercluster are derived, but they are uncertain because the clusters merge into one another, so that it is difficult to identify them and their member galaxies unambiguously. However, those regions in Hercules containing the largest proportion of early-type galaxies show the least evidence for gravitational relaxation. A difference may exist between the luminosity function of clusters of galaxies and the luminosity function of the foreground sheet.
Chincarini Guido
Rood Herbert J.
Tarenghi Marco
Thompson Laird A.
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