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SuperCLASS – I. The super cluster assisted shear survey : Project overview and data release 1.

Whittaker, Lee and Tunbridge, Ben and Thomson, A.P. and Thomas, Daniel B. and Sanders, David B. and Peters, Aaron and Kay, Scott T. and Hillier, Tom and Camera, Stefano and Bonaldi, Anna and Muxlow, Tom W.B. and Beswick, Robert J. and Chapman, Scott and Demetroullas, Constantinos and Birkinshaw, Mark and Abdalla, Filipe B. and Riseley, Christopher J. and Hung, Chao-Ling and Manning, Sinclaire M. and Hales, Christopher A. and Watson, Robert A. and Smail, Ian and Jackson, Neal J. and Harrison, Ian and Casey, Caitlin M. and Brown, Michael L. and Battye, Richard A. (2020) 'SuperCLASS – I. The super cluster assisted shear survey : Project overview and data release 1.', Monthly notices of the Royal Astronomical Society., 495 (2). pp. 1706-1723.


The SuperCLuster Assisted Shear Survey (SuperCLASS) is a legacy programme using the e-MERLIN interferometric array. The aim is to observe the sky at L-band (1.4 GHz) to a r.m.s. of 7μJybeam−1 over an area of ∼1deg2 centred on the Abell 981 supercluster. The main scientific objectives of the project are: (i) to detect the effects of weak lensing in the radio in preparation for similar measurements with the Square Kilometre Array (SKA); (ii) an extinction free census of star formation and AGN activity out to z ∼ 1. In this paper we give an overview of the project including the science goals and multiwavelength coverage before presenting the first data release. We have analysed around 400 h of e-MERLIN data allowing us to create a Data Release 1 (DR1) mosaic of ∼0.26deg2 to the full depth. These observations have been supplemented with complementary radio observations from the Karl G. Jansky Very Large Array (VLA) and optical/near infrared observations taken with the Subaru, Canada-France-Hawaii, and Spitzer Telescopes. The main data product is a catalogue of 887 sources detected by the VLA, of which 395 are detected by e-MERLIN and 197 of these are resolved. We have investigated the size, flux, and spectral index properties of these sources finding them compatible with previous studies. Preliminary photometric redshifts, and an assessment of galaxy shapes measured in the radio data, combined with a radio-optical cross-correlation technique probing cosmic shear in a supercluster environment, are presented in companion papers.

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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:25 February 2020
Date deposited:15 July 2020
Date of first online publication:02 April 2020
Date first made open access:15 July 2020

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