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|Title:||The XXL Survey: XXXIV. Double irony in XXL-North. A tale of two radio galaxies in a supercluster at z = 0.14||Authors:||Horellou, C.
Intema, H. T.
POGGIANTI, Bianca Maria
Ramos-Ceja, M. E.
Röttgering, H. J. A.
|Issue Date:||2018||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||620||First Page:||A19||Abstract:||Aims: We show how the XXL multiwavelength survey can be used to shed light on radio galaxies and their environment. <BR /> 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. <BR /> 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 10<SUP>14</SUP> M<SUB>☉</SUB>, 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. <BR /> Conclusions: Radio Galaxies can be used to find galaxy clusters/groups that are below the current sensitivity of X-ray surveys. <P />FITS files of the GMRT 610 MHz radio images of the two radio galaxies are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://18.104.22.168) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/620/A19">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/620/A19||Note:||Part of the second data release of the XXL Survey. Associated data is accessible via CDS and via the XXL Database hosted at IASF-MI||URI:||http://hdl.handle.net/20.500.12386/27594||URL:||https://www.aanda.org/articles/aa/full_html/2018/12/aa32972-18/aa32972-18.html
|Appears in Collections:||1.01 Articoli in rivista|
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