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We show how the XXL multiwavelength survey can be used to shed light on radiogalaxies and their environment. Two prominent radio galaxies were identified ina visual examination of the mosaic of XXL-North obtained with the GiantMetrewave Radio Telescope at 610MHz. Counterparts were searched for in otherbands. Spectroscopic redshifts from the GAMA database were used to identifyclusters and/or groups of galaxies, estimate their masses with the causticmethod, and quantify anisotropies in the surrounding galaxy distribution via aFourier analysis. Both radio galaxies are of FR I type and are hosted byearly-type galaxies at a redshift of 0.138. The first radio source, named theExemplar, has a physical extent of about 400 kpc; it is located in the clusterXLSSC112, which has a temperature of about 2 keV, a total mass of about$10^{14} M_\odot$, and resides in an XXL supercluster with eight known members.The second source, named the Double Irony, is a giant radio galaxy with a totallength of about 1.1 Mpc. Its core coincides with a cataloged point-like X-raysource, but no extended X-ray emission from a surrounding galaxy cluster wasdetected. However, from the optical data we determined that the host is thebrightest galaxy in a group that is younger, less virialized, and less massivethan the Exemplar's cluster. A friends-of-friends analysis showed that theDouble Irony's group is a member of the same supercluster as the Exemplar.There are indications that the jets and plumes of the Double Irony have beendeflected by gas associated with the surrounding galaxy distribution. Anotheroverdensity of galaxies (the tenth) containing a radio galaxy was found to beassociated with the supercluster. Radio galaxies can be used to find galaxyclusters/groups that are below the current sensitivity of X-ray surveys.

The XXL Survey: XXXIV. Double irony in XXL-North. A tale of two radio galaxies in a supercluster at z = 0.14