ATCA observations of the MACS-Planck Radio Halo Cluster Project. I. New detection of a radio halo in PLCK G285.0-23.7

Journal
Date Issued
2016
Author(s)
Martinez Aviles, G.
•
Ferrari, C.
•
Johnston-Hollitt, M.
•
Pratley, L.
•
Macario, G.
•
•
•
•
•
Intema, H. T.
•
Giacintucci, S.
•
Hurier, G.
•
Aghanim, N.
•
Douspis, M.
•
Langer, M.
DOI
Abstract
Aims: We investigate the possible presence of diffuse radio emission in the intermediate redshift, massive cluster PLCK G285.0-23.7 (z = 0.39, M500 = 8.39 × 1014M☉). Methods: Our 16 cm-band ATCA observations of PLCK G285.0-23.7 allow us to reach a rms noise level of 11 μJy/beam on the wide-band (1.1-3.1 GHz), full-resolution ( 5 arcsec) image of the cluster, making it one of the deepest ATCA images yet published. We also re-image visibilities at lower resolution in order to achieve a better sensitivity to low-surface-brightness extended radio sources. Results: We detect one of the lowest luminosity radio halos known at z > 0.35, characterised by a slight offset from the well-studied 1.4 GHz radio power vs. cluster mass correlation. Similarly to most known radio-loud clusters (I.e. those hosting diffuse non-thermal sources), PLCK G285.0-23.7 has a disturbed dynamical state. Our analysis reveals a similarly elongated X-ray and radio morphology. While the size of the radio halo in PLCK G285.0-23.7 is smaller than lower redshift radio-loud clusters in the same mass range, it shows a similar correlation with the cluster virial radius, as expected in the framework of hierarchical structure formation.

The reduced image (FITS file) is only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/595/A116

Volume
595
Start page
A116
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2016A&A...595A.116M
Rights
open.access
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