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

Horellou, C.; Intema, H.T.; Smolčić, V.; Nilsson, A.; Karlsson, F.; Krook, C.; Tolliner, L.; Adami, C.; Benoist, C.; Birkinshaw, M.; Caretta, C.; Chiappetti, L.; Delhaize, J.; Ferrari, C.; Fotopoulou, S.; Guglielmo, V.; Kolokythas, K.; Pacaud, F.; Pierre, M.; Poggianti, B.M.; Ramos-Ceja, M.E.; Raychaudhury, S.; Röttgering, H.J.A.; Vignali, C.

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


Authors

C. Horellou

H.T. Intema

V. Smolčić

A. Nilsson

F. Karlsson

C. Krook

L. Tolliner

C. Adami

C. Benoist

M. Birkinshaw

C. Caretta

L. Chiappetti

J. Delhaize

C. Ferrari

S. Fotopoulou

V. Guglielmo

K. Kolokythas

F. Pacaud

M. Pierre

B.M. Poggianti

M.E. Ramos-Ceja

S. Raychaudhury

H.J.A. Röttgering

C. Vignali



Abstract

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 M, 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.

Citation

Horellou, C., Intema, H., Smolčić, V., Nilsson, A., Karlsson, F., Krook, C., …Vignali, C. (2018). The XXL Survey: XXXIV. Double Irony in XXL-North: a tale of two radio galaxies in a supercluster at z = 0.14. Astronomy & Astrophysics, 620, https://doi.org/10.1051/0004-6361/201832972

Journal Article Type Article
Acceptance Date Jul 12, 2018
Online Publication Date Nov 20, 2018
Publication Date Nov 20, 2018
Deposit Date Dec 6, 2018
Publicly Available Date Mar 29, 2024
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 620
DOI https://doi.org/10.1051/0004-6361/201832972

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Copyright Statement
Reproduced with permission from Astronomy & Astrophysics, © ESO.





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