Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24..301o&link_type=abstract
IN: Quasars and gravitational lenses; Proceedings of the Twenty-Fourth Liege International Astrophysical Colloquium, Cointe-Ougr
Astronomy and Astrophysics
Astrophysics
2
Galactic Clusters, Quasars, Spatial Distribution, Density Distribution, Northern Sky, Red Shift
Scientific paper
The indirect evidence for an association between occurrence of quasars and the superclustering of galaxies is reviewed. It is pointed out that none of the giant superclusters found by optical techniques contains a quasar, and that extensive radio surveys of faint quasars with redshifts will be required to obtain direct evidence. At present, two dense concentrations are identified as candidates for superclusters with quasar components. These clusters are; (1) a dense superstructure at z = 0.37 containing four quasars within a diameter of about 140 Mpc (assuming a Hubble constant of 50); and (2) a group of three distant quasars near M 82 within a region of 0.2 Mpc and having redshifts between 2.040 and 2.054. An equation is formulated for expressing the possibility of finding superclusters among distant quasars.
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