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ABSTRACT  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.

Radio‐loud active galactic nuclei and the L X –σ relation of galaxy groups and clusters