Journal Article

Radio-loud active galactic nuclei and the <i>L</i><sub>X</sub>–σ relation of galaxy groups and clusters

Shiyin Shen, Guinevere Kauffmann, Anja Von Der Linden, Simon D. M. White and P. N. Best

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 3, pages 1074-1086
Published in print September 2008 | ISSN: 0035-8711
Published online September 2008 | e-ISSN: 1365-2966 | DOI:
Radio-loud active galactic nuclei and the LX–σ relation of galaxy groups and clusters

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We use the ROSAT All-Sky Survey to study the X-ray properties of a sample of 625 groups and clusters of galaxies selected from the Sloan Digital Sky Survey. We stack clusters with similar velocity dispersions and investigate whether their average X-ray luminosities and surface brightness profiles vary with the radio activity level of their central galaxies. We find that at a given value of σ, clusters with a central radio active galactic nucleus (AGN) have more concentrated X-ray surface brightness profiles, larger central galaxy masses and higher X-ray luminosities than clusters with radio-quiet central galaxies. The enhancement in X-ray luminosity is more than a factor of 2, is detected with better than 6σ significance and cannot be explained by X-ray emission from the radio AGN itself. This difference is largely due to a subpopulation of radio-quiet, high velocity dispersion clusters with low-mass central galaxies. These clusters are underluminous at X-ray wavelengths when compared to otherwise similar clusters where the central galaxy is radio-loud, more massive, or both.

Keywords: galaxies: clusters: general; galaxies: jets

Journal Article.  10079 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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