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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
SuperCLASS – II. Photometric redshifts and characteristics of spatially resolved μJy radio sources
Monthly Notices of the Royal Astronomical Society, Volume 495, No. 2, Year 2020
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Description
We present optical and near-infrared imaging covering a ∼1.53 deg2 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 ≈176 000 sources down to iÁB ∼ 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 deg2. We compile an initial catalogue of 149 radio sources brighter than S1.4 > 75 μJy and find their photometric redshifts span 0 < zphot < 4 with radio luminosities between 1021 and 1025 W Hz−1, with medians of 〈z〉 = 0.55 and 〈L1.4〉 = 1.9 × 1023 W Hz−1, respectively. We find 95 per cent of the μJy 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 α = 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 σ in the density map and we confirm the photometric redshifts are consistent with previously measured spectra from a few galaxies at the cluster centres. © 2020 The Author(s).
Authors & Co-Authors
Casey, Caitlin M.
United States, Austin
The University of Texas at Austin
Battye, Richard A.
United Kingdom, Manchester
The University of Manchester
Brown, Michael L.
United Kingdom, Manchester
The University of Manchester
Jackson, Neal J.F.
United Kingdom, Manchester
The University of Manchester
Abdalla, Fillipe Batoni
United Kingdom, London
University College London
Chapman, Scott C.
Canada, Halifax
Dalhousie University
Hales, Christopher A.
United States, Socorro
National Radio Astronomy Observatory Socorro
United Kingdom, Newcastle
Newcastle University
Harrison, Ian P.
United Kingdom, Manchester
The University of Manchester
United Kingdom, Oxford
University of Oxford
Riseley, C. J.
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Italy, Bologna
Istituto Di Radioastronomia, Bologna
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Sanders, David B.
United States, Honolulu
University of Hawaiʻi at Mānoa
Watson, Robert A.
United Kingdom, Manchester
The University of Manchester
Statistics
Citations: 3
Authors: 11
Affiliations: 13
Identifiers
Doi:
10.1093/mnras/staa657
ISSN:
00358711
Study Design
Cross Sectional Study
Study Approach
Quantitative