Statistics – Computation
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..358h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 15, 1990, p. 358-364.
Statistics
Computation
3
Galactic Clusters, Local Group (Astronomy), Quasars, Red Shift, Sky Surveys (Astronomy), Computational Astrophysics, Data Correlation, Seyfert Galaxies
Scientific paper
Sky Survey prints are used to make counts of galaxies within circles of diameters 2.1, 4.4, 6.6, and 9.1 arcmin around low-redshift QSOs (z less than 0.3) and also in nearby control regions. Counts were also made for a control sample of high-redshift QSOs (z greater than 1.2) in 4.4-arcmin circles. A significant excess of galaxies was found around the low-redshift QSOs. Counts in regions of Abell clusters and other rich clusters show the clusters associated with QSOs not to be rich clusters. Calculations of how many galaxies would be counted around QSOs if local groups were associated with them show the associated groups to be slightly richer than the Galaxy's Local Group. The QSO-galaxy correlation is shown to be stronger than the galaxy-galaxy correlation.
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