Journal Article

A radio survey of seven southern X-ray luminous clusters of galaxies

O. B. Slee, H. Andernach, V. J. McIntyre and G. Tsarevsky

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 1, pages 297-319
Published in print November 2008 | ISSN: 0035-8711
Published online November 2008 | e-ISSN: 1365-2966 | DOI:
A radio survey of seven southern X-ray luminous clusters of galaxies

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The Australia Telescope Compact Array (ATCA) has been used at 1.38 and 2.38 GHz to survey seven southern Abell clusters of galaxies with high X-ray luminosities: A2746, A2837, A3126, A3216, A3230, A3827 and A3836. The clusters have also been surveyed at 0.843 GHz with the Molonglo Observatory Synthesis Telescope (MOST). We have listed a complete 1.38-GHz sample of 149 radio sources within the Abell circles centred on their X-ray centroids. We compare their identification fractions, emitted 1.38 GHz and optical powers, radio spectral indices and radial variation in projected source density with those of the radio-selected samples of Slee, Roy & Andernach. We compare our fractional radio luminosity function with that of the radio-selected samples of Ledlow & Owen and Slee et al. Three significant differences are noted between X-ray and radio-selected samples of clusters: (1) the X-ray sample has an excess of flat-spectrum radio sources; (2) the fractional radio luminosity function for the Fanaroff–Riley I (FR I) sources in the X-ray selected sample is much steeper, implying that fewer of their cluster galaxies become hosts for the stronger FR I radio galaxies; (3) a complete absence of Fanaroff–Riley II (FR II) radio galaxies in the X-ray selected sample. The average excess projected density of radio sources near our cluster centres is ∼five times the background source density.

Keywords: surveys; galaxies: clusters: general; radio continuum: galaxies; X-rays: galaxies: clusters

Journal Article.  14661 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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