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.

Methods: data analysis

Radiation mechanisms: non-thermal

Galaxies: magnetic fields

Radio continuum: galaxies

Galaxies: active


Cathy Horellou

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Extragalaktisk astrofysik

H. T. Intema

Universiteit Leiden

V. Smolcic

Sveučilište u Zagrebu

Anton Nilsson

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

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

INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan

J. Delhaize

Sveučilište u Zagrebu

C. Ferrari

Observatoire de la Cote d'Azur

S. Fotopoulou

Durham University

V. Guglielmo

Osservatorio Astronomico di Padova

Max Planck-institutet

K. Kolokythas

Inter-University Centre for Astronomy and Astrophysics India

F. Pacaud

Universität Bonn

M. Pierre

Université Paris-Saclay

B. M. Poggianti

Osservatorio Astronomico di Padova

M. E. Ramos-Ceja

Universität Bonn

S. Raychaudhury

Inter-University Centre for Astronomy and Astrophysics India

H. Rottgering

Universiteit Leiden

Cristian Vignali

Universita di Bologna

INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 620 A19


Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Annan fysik



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