Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380l...9b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. L9-L12.
Astronomy and Astrophysics
Astrophysics
49
Correlation, Galactic Clusters, Quasars, Cosmology, Red Shift
Scientific paper
It is suggested that the origin of the observed quasar correlation function, which is intermediate in strength between that of galaxies and of rich clusters, is the preferential location of quasars in small groups of galaxies. The quasars then trace the same large-scale structure of the parent galaxy groups. According to this picture, optically selected quasars are located in small groups of about 10 L* galaxies on average, and have the same correlations as expected for the small groups. Radio-selected quasars are, according to the same picture, located in richer groups of about 30 L* galaxies on average, having the stronger correlations expected for these richer groups. These results are consistent with observations of quasars environment and with the universal richness-dependent cluster correlation function. The results also imply that groups and clusters of galaxies, as well as the large-scale structure they trace, exist at the high redshifts observed in quasar correlations.
Bahcall Neta A.
Chokshi Arati
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