Mathematics – Logic
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..683w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, May 1982, p. 683-705.
Mathematics
Logic
65
Quasars, Red Shift, Spatial Distribution, Star Clusters, Astronomical Coordinates, Density Distribution, Fourier Transformation, Power Spectra, Prisms, Statistical Analysis
Scientific paper
The positions and redshifts of 108 quasars from the Cerro Tololo objective-prism survey are subjected to Fourier Power Spectrum Analysis in a search for clustering in their spatial distribution. It is found that, on the whole, these quasars are not clustered but are scattered in space independently at random. The sole exception is a group of four quasars at z = 0.37 which has a low probability of being a chance event and which, with a size of about 100 Mpc, may therefore be the largest known structure in the Universe. The conclusions disagree with Arp's analysis of this catalogue: his 'clouds of quasars' ejected by certain low-redshift galaxies, for example, are attributable to sensitivity variations among the different plates of the survey. It is shown that analysis of deeper surveys is likely to show up quasar clusters even at high redshift, and could therefore provide a useful new cosmological probe.
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