Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24..307a&link_type=abstract
IN: Quasars and gravitational lenses; Proceedings of the Twenty-fourth Liege International Astrophysical Colloquium, Cointe-Ougr
Astronomy and Astrophysics
Astronomy
11
Galactic Clusters, Quasars, Radio Sources (Astronomy), Red Shift, Alignment, Heao 2, Histograms, Oort Cloud, Spiral Galaxies
Scientific paper
The available observations on high redshift quasars have been analyzed by Oort et al. (1982). If the quasars are at their redshift distances and belong to superclusters, there must exist far less than one quasar per average supercluster. The present investigation is concerned with a review of evidence for quasars occurring in small groups, in larger concentrations, and in association with other kinds of objects. Tight groupings of quasars are examined, taking into account the Group SW of NGC 450, the Group SE of NGC 2639, NGC 1097 NE, NGC 520, and a discussion of dense groups. In connection with a discussion of quassars in larger concentrations, attention is given to quasars in a complete field around NGC 1097, and quasars near NGC 520. The redshift-luminosity relation for quasars is considered along with questions concerning alignments, triples, and redshift pairing across galaxies.
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