Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 495, Issue 2, Pages 1724-1736Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa657
Keywords
galaxies: distances and redshifts; galaxies: photometry; cosmology: observations
Categories
Funding
- National Science Foundation [AST-1714528, AST-1814034, DGE-1610403]
- University of Texas at Austin College of Natural Sciences
- IF/THEN, an initiative of Lydia Hill Philanthropies
- European Research Council (ERC) [280127]
- ERC [681431]
- Beecroft Trust
- European Union [705332]
- European Research Council (ERC) [681431] Funding Source: European Research Council (ERC)
- STFC [ST/R001170/1, ST/T000414/1, ST/R006865/1] Funding Source: UKRI
- Marie Curie Actions (MSCA) [705332] Funding Source: Marie Curie Actions (MSCA)
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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.
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