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Title: SuperCLASS - II. Photometric redshifts and characteristics of spatially resolved mu Jy radio sources
Authors: Manning, Sinclaire M. 
Casey, Caitlin M. 
Hung, Chao-Ling 
Battye, Richard A. 
Brown, Michael L. 
Jackson, Neal 
Abdalla, Filipe B. 
Chapman, Scott 
Demetroullas, Constantinos 
Drew, Patrick 
Hales, Christopher A. 
Harrison, Ian 
Riseley, Christopher J. 
Sanders, David B. 
Major Field of Science: Natural Sciences
Field Category: Physical Sciences
Keywords: Galaxies: distances and redshifts;Galaxies: photometry;Cosmology: observations
Issue Date: Jun-2020
Source: Monthly Notices of the Royal Astronomical Society, 2020, vol. 495, no. 2, pp. 1724-1736
Volume: 495
Issue: 2
Start page: 1724
End page: 1736
Journal: Monthly Notices of the Royal Astronomical Society 
Abstract: We present optical and near-infrared imaging covering a similar to 1.53 deg(2) region in the Super-Cluster Assisted Shear Survey (SuperCLASS) field, which aims to make the first robust weak lensing measurement at radio wavelengths. We derive photometric redshifts for approximate to 176 000 sources down to i'(AB) similar to 24 and present photometric redshifts for 1.4 GHz expanded Multi-Element Radio Linked Interferometer Network (e-MERLIN) and Karl G. Jansky Very Large Array (VLA) detected radio sources found in the central 0.26 deg(2). We compile an initial catalogue of 149 radio sources brighter than S-1.4 > 75 mu Jy and find their photometric redshifts span 0 < z(phot) < 4 with radio luminosities between 10(21) and 10(25) WHz(-1), with medians of < z > = 0.55 and < L-1.4 > = 1.9 x 10(23) WHz(-1), respectively. We find 95 per cent of the mu Jy radio source sample (141/149) have spectral energy distributions (SEDs) best fit by star-forming templates while 5 per cent (8/149) are better fit by active galactic nuclei (AGN). Spectral indices are calculated for sources with radio observations from the VLA and Giant Metrewave Radio Telescope (GMRT) at 325 MHz, with an average spectral slope of alpha = 0.59 +/- 0.04. Using the full photometric redshift catalogue, we construct a density map at the redshift of the known galaxy clusters, z = 0.20 +/- 0.08. Four of the five clusters are prominently detected at > 7 sigma in the density map and we confirm the photometric redshifts are consistent with previously measured spectra from a few galaxies at the cluster centres.
ISSN: 1365-2966
DOI: 10.1093/mnras/staa657
Rights: © The Author(s)
Type: Article
Affiliation : University of Texas System 
University of Texas at Austin 
Manhattan College 
University of Manchester 
University College London 
Dalhousie University 
Cyprus University of Technology 
National Radio Astronomy Observatory 
Newcastle University 
University of Oxford 
University of Bologna 
Istituto Nazionale Astrofisica 
Commonwealth Scientific & Industrial Research Organisation 
University of Hawaii System 
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