The XXL Survey: XXXIV. Double Irony in XXL-North: A tale of two radio galaxies in a supercluster at z = 0.14
MetadataShow full item record
Aims. We show how the XXL multiwavelength survey can be used to shed light on radio galaxies and their environment. Methods. Two prominent radio galaxies were identified in a visual examination of the mosaic of XXL-North obtained with the Giant Metrewave Radio Telescope at 610 MHz. Counterparts were searched for in other bands. Spectroscopic redshifts from the GAMA database were used to identify clusters and/or groups of galaxies, estimate their masses with the caustic method, and quantify anisotropies in the surrounding galaxy distribution via a Fourier analysis. Results. Both radio galaxies are of FR I type and are hosted by early-type galaxies at a redshift of 0.138. The first radio source, named the Exemplar, has a physical extent of ~400 kpc; it is located in the cluster XLSSC 112, which has a temperature of ~2 keV, a total mass of ~1014 Mo, and resides in an XXL supercluster with eight known members. The second source, named the Double Irony, is a giant radio galaxy with a total length of about 1.1 Mpc. Its core coincides with a cataloged point-like X-ray source, but no extended X-ray emission from a surrounding galaxy cluster was detected. However, from the optical data we determined that the host is the brightest galaxy in a group that is younger, less virialized, and less massive than the Exemplar's cluster. A friends-of-friends analysis showed that the Double 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 been deflected by gas associated with the surrounding galaxy distribution. Another overdensity of galaxies (the tenth) containing a radio galaxy was found to be associated with the supercluster. Conclusions. Radio Galaxies can be used to find galaxy clusters/groups that are below the current sensitivity of X-ray surveys.
Reproduced with permission from Astronomy & Astrophysics, © ESO
Showing items related by title, author, creator and subject.
Hatch, N.; De Breuck, C.; Galametz, A.; Miley, G.; Overzier, R.; Röttgering, H.; Doherty, M.; Kodama, T.; Kurk, J.; Seymour, Nick; Venemans, B.; Vernet, J.; Zirm, A. (2011)We study the environments of six radio galaxies at 2.2 < z < 2.6 using wide-field near-infrared images. We use colour cuts to identify galaxies in this redshift range, and find that three of the radio galaxies are surrounded ...
HST Grism Confirmation of 16 Structures at 1.4 < z < 2.8 from the Clusters Around Radio-Loud AGN (CARLA) SurveyNoirot, G.; Stern, D.; Mei, S.; Wylezalek, D.; Cooke, E.; De Breuck, C.; Galametz, A.; Hatch, N.; Vernet, J.; Brodwin, M.; Eisenhardt, P.; Gonzalez, A.; Jarvis, M.; Rettura, A.; Seymour, Nick; Stanford, S. (2018)We report spectroscopic results from our 40-orbit Hubble Space Telescope slitless grism spectroscopy program observing the 20 densest Clusters Around Radio-Loud AGN (CARLA) candidate galaxy clusters at 1.4 < z < 2.8. These ...
Govoni, F.; Murgia, M.; Vacca, V.; Loi, F.; Girardi, M.; Gastaldello, F.; Giovannini, G.; Feretti, L.; Paladino, R.; Carretti, E.; Concu, R.; Melis, A.; Poppi, S.; Valente, G.; Bernardi, G.; Bonafede, A.; Boschin, W.; Brienza, M.; Clarke, T.; Colafrancesco, S.; De Gasperin, F.; Eckert, D.; Enßlin, T.; Ferrari, C.; Gregorini, L.; Johnston-Hollitt, Melanie; Junklewitz, H.; Orrù, E.; Parma, P.; Perley, R.; Rossetti, M.; B Taylor, G.; Vazza, F. (2017)© ESO, 2017. Aims. We study the intra-cluster magnetic field in the poor galaxy cluster Abell 194 by complementing radio data, at different frequencies, with data in the optical and X-ray bands. Methods. We analyzed new ...