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Lookup NU author(s): Dr Christopher Hales
We present a deep survey of the SuperCLASS super-cluster - a region of sky known to contain five Abell clusters at redshift z∼0.2 - performed using the Arcminute Microkelvin Imager (AMI) Large Array (LA) at 15.5 GHz. Our survey covers an area of approximately 0.9 square degrees. We achieve a nominal sensitivity of 32.0 μJy beam^−1 toward the field centre, finding 80 sources above a 5σ threshold. We derive the radio colour-colour distribution for sources common to three surveys that cover the field and identify three sources with strongly curved spectra - a high-frequency-peaked source and two GHz-peaked-spectrum sources. The differential source count (i) agrees well with previous deep radio source count, (ii) exhibits no evidence of an emerging population of star-forming galaxies, down to a limit of 0.24 mJy, and (iii) disagrees with some models of the 15 GHz source population. However, our source count is in agreement with recent work that provides an analytical correction to the source count from the SKADS Simulated Sky, supporting the suggestion that this discrepancy is caused by an abundance of flat-spectrum galaxy cores as-yet not included in source population models.
Author(s): Riseley CJ, Grainge KJB, Perrott YC, Scaife AMM, Battye RA, Beswick RJ, Birkinshaw M, Brown ML, Casey CM, Demetroullas C, Hales CA, Harrison I, Hung CL, Jackson NL, Muxlow T, Watson B, Cantwell TM, Carey SH, Elwood PJ, Hickish J, Jin TZ, Razavi-Ghods N, Scott PF, Titterington DJ
Publication type: Article
Publication status: Published
Journal: Monthly Notices of the Royal Astronomical Society
Year: 2018
Volume: 474
Issue: 4
Pages: 5598–5613
Print publication date: 11/03/2018
Online publication date: 01/12/2017
Acceptance date: 29/11/2017
Date deposited: 04/12/2017
ISSN (print): 1365-2966
ISSN (electronic): 0035-8711
Publisher: Oxford University Press
URL: https://doi.org/10.1093/mnras/stx3118
DOI: 10.1093/mnras/stx3118
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