The clustering of galaxies about extragalactic radio sources

Details The clustering of galaxies about extragalactic radio sources The clustering of galaxies about extragalactic radio sources

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.189..433l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 189, Nov. 1979, p. 433-453.

Astronomy and Astrophysics

Astronomy

168

Astronomical Spectroscopy, Cross Correlation, Extragalactic Radio Sources, Galactic Clusters, Amplitudes, Autocorrelation, Emission Spectra, Line Spectra, Luminous Intensity

Scientific paper

Clustering of galaxies about extragalactic radio sources is investigated by cross correlating the radio positions of 3CR and 4C sources with the positions of Zwicky galaxies and galaxies included in Lick counts. The cross-correlation functions are used to determine a linear clustering scale that ranges from galaxies selected at random in the universe to rich clusters of galaxies. It is found that: (1) the cross-correlation function for galaxies about radio sources has the same form as the galaxy-galaxy autocorrelation function on angular scales less than 1.5 deg of arc; (2) very weak radio galaxies show no tendency to belong to groups or clusters of galaxies; (3) on the average, extended powerful radio sources are observed in regions of space where the amplitude of the spatial cross-correlation function is about four to five times that of galaxies selected at random; (4) classical double sources with strong emission-line spectra have a cross-correlation function with galaxies similar to that of randomly selected galaxies; and (5) complex radio sources associated with galaxies having only an absorption-line spectrum or a weak emission spectrum belong to groups and clusters of galaxies.

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