The XXL Survey: XXXIV. Double Irony in XXL-North: A tale of two radio galaxies in a supercluster at z = 0.14
Artikel i vetenskaplig tidskrift, 2018
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.
Radiation mechanisms: non-thermal
Radio continuum: galaxies
Galaxies: magnetic fields
Methods: data analysis
Galaxies: active
Författare
Cathy Horellou
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
H. T. Intema
Universiteit Leiden
V. Smolcic
Sveučilište u Zagrebu
Andreas Nilsson
Student vid Chalmers
F. Karlsson
Chalmers, Rymd-, geo- och miljövetenskap
C. Krook
Chalmers, Rymd-, geo- och miljövetenskap
L. Tolliner
Chalmers, Rymd-, geo- och miljövetenskap
C. Adami
Laboratoire d'Astrophysique de Marseille
C. Benoist
Observatoire de la Cote d'Azur
M. Birkinshaw
University of Bristol
C. Caretta
Universidad de Guanajuato
L. Chiappetti
Istituto nazionale di astrofisica (INAF)
J. Delhaize
Sveučilište u Zagrebu
C. Ferrari
Observatoire de la Cote d'Azur
S. Fotopoulou
Durham University
V. Guglielmo
Max-Planck-Gesellschaft
Istituto nazionale di astrofisica (INAF)
K. Kolokythas
Inter-University Centre for Astronomy and Astrophysics
F. Pacaud
Universität Bonn
M. Pierre
Université Paris-Saclay
B. M. Poggianti
Istituto nazionale di astrofisica (INAF)
M. E. Ramos-Ceja
Universität Bonn
S. Raychaudhury
Inter-University Centre for Astronomy and Astrophysics
H. Rottgering
Universiteit Leiden
Cristian Vignali
Istituto nazionale di astrofisica (INAF)
Universita di Bologna
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 620 A19Ämneskategorier
Astronomi, astrofysik och kosmologi
Atom- och molekylfysik och optik
Annan fysik
DOI
10.1051/0004-6361/201832972