Please use this identifier to cite or link to this item: https://ktisis.cut.ac.cy/handle/10488/19461
Title: SuperCLASS - III. Weak lensing from radio and optical observations in Data Release 1
Authors: Harrison, Ian 
Brown, Michael L. 
Tunbridge, Ben 
Thomas, Daniel B. 
Hillier, Tom 
Thomson, A. P. 
Whittaker, Lee 
Abdalla, Filipe B. 
Battye, Richard A. 
Bonaldi, Anna 
Camera, Stefano 
Casey, Caitlin M. 
Demetroullas, Constantinos 
Hales, Christopher A. 
Jackson, Neal J. 
Kay, Scott T. 
Manning, Sinclaire M. 
Peters, Aaron 
Riseley, Christopher J. 
Watson, Robert A. 
Major Field of Science: Natural Sciences
Field Category: Physical Sciences
Keywords: Gravitational lensing: weak;Dark matter;Large-scale structure of Universe – cosmology: observations;Radio continuum: galaxies
Issue Date: Jun-2020
Source: Monthly Notices of the Royal Astronomical Society, 2020, vol. 495, no. 2, pp. 1737-1759
Volume: 495
Issue: 2
Start page: 1737
End page: 1759
Journal: Monthly Notices of the Royal Astronomical Society 
Abstract: We describe the first results on weak gravitational lensing from the SuperCLASS survey: the first survey specifically designed to measure the weak lensing effect in radio-wavelength data, both alone and in cross-correlation with optical data. We analyse 1.53 deg(2) of optical data from the Subaru telescope and 0.26 deg(2) of radio data from the e-MERLIN and VLA telescopes (the DR1 data set). Using standard methodologies on the optical data only we make a significant (10 sigma) detection of the weak lensing signal (a shear power spectrum) due to the massive supercluster of galaxies in the targeted region. For the radio data we develop a new method to measure the shapes of galaxies from the interferometric data, and we construct a simulation pipeline to validate this method. We then apply this analysis to our radio observations, treating the e-MERLIN and VLA data independently. We achieve source densities of 0.5 arcmin(-2) in the VLA data and 0.06 arcmin(-2) in the e-MERLIN data, numbers which prove too small to allow a detection of a weak lensing signal in either the radio data alone or in cross-correlation with the optical data. Finally, we show preliminary results from a visibility-plane combination of the data from e-MERLIN and VLA which will be used for the forthcoming full SuperCLASS data release. This approach to data combination is expected to enhance both the number density of weak lensing sources available, and the fidelity with which their shapes can be measured.
URI: https://ktisis.cut.ac.cy/handle/10488/19461
ISSN: 1365-2966
DOI: 10.1093/mnras/staa696
Rights: © The Author(s)
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation : University of Manchester 
University of Oxford 
University College London 
Jodrell Bank Centre for Astrophysics 
University of Turin 
Istituto Nazionale di Fisica Nucleare 
University of Texas at Austin 
Cyprus University of Technology 
National Radio Astronomy Observatory 
Newcastle University 
University of Bologna 
Commonwealth Scientific & Industrial Research Organisation 
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