The trivariate (radio, optical, X-ray) luminosity function of cD galaxies. I - New Westerbork observations of 22 cD galaxies and Einstein observations of A 1918 and A 2317.

W. Bijleveld, E. A. Valentijn

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Synthesis radio telescope observations of 22 cD galaxies at 1412 MHz, and Einstein Observatory X-ray observations of 2 cDs, indicate that the centers of the two detected X-ray sources coincide with the optical centers of the cD galaxies. This again demonstrates the existence of a special class of X-ray sources associated with cD galaxies, and completes the accumulation of data required for the construction of the trivariate radio luminosity function of cD galaxies. In addition, a sample of 81 cD galaxies in clusters and 23 cD galaxies in poor groups is studied in order to test the hypothesis that radio sources in elliptical galaxies are fueled by a fraction of accreted X-ray gas. Results suggest that gas accretion into normal and giant elliptical galaxies might be a very general phenomenon, providing a natural explanation of the radio, optical, and X-ray properties of elliptical galaxies.
Original languageEnglish
Pages (from-to)217-240
JournalAstronomy and astrophysics
Issue number2
Publication statusPublished - 1-Sep-1983


  • Galactic Clusters
  • Luminosity
  • Radiant Flux Density
  • Radio Astronomy
  • X Ray Astronomy
  • Astronomical Maps
  • Functions (Mathematics)
  • Galactic Nuclei

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