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The Rapid ASKAP Continuum Survey I: Design and first results

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA 37 ARTN e048

Authors:

D McConnell, Jk Banfield, George Heald, Alec JM Thomson, M Whiting, James R Allison, Sw Amy, C Anderson, Lewis Ball, Keith W Bannister, Martin Bell, Douglas C-J Bock, Russ Bolton, Jd Bunton, Ap Chippendale, Jd Collier, N Gupta, Douglas B Hayman, Ian Heywood, Ca Jackson, Barbel S Koribalski, Chenoa Tremblay, A Tzioumis, Ma Voronkov, Tobias Westmeier

Abstract:

© The Author(s), 2020. Published by Cambridge University Press on behalf of the Astronomical Society of Australia. The Rapid ASKAP Continuum Survey (RACS) is the first large-area survey to be conducted with the full 36-antenna Australian Square Kilometre Array Pathfinder (ASKAP) telescope. RACS will provide a shallow model of the ASKAP sky that will aid the calibration of future deep ASKAP surveys. RACS will cover the whole sky visible from the ASKAP site in Western Australia and will cover the full ASKAP band of 700-1800 MHz. The RACS images are generally deeper than the existing NRAO VLA Sky Survey and Sydney University Molonglo Sky Survey radio surveys and have better spatial resolution. All RACS survey products will be public, including radio images (with <![CDATA[ $\sim$ ]]> 15 arcsec resolution) and catalogues of about three million source components with spectral index and polarisation information. In this paper, we present a description of the RACS survey and the first data release of 903 images covering the sky south of declination <![CDATA[ $+41^\circ$ ]]> made over a 288-MHz band centred at 887.5 MHz.
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The environment and host haloes of the brightest z~6 Lyman-break galaxies

MNRAS

Authors:

PW Hatfield, RAA Bowler, MJ Jarvis, CL Hale

Abstract:

By studying the large-scale structure of the bright high-redshift Lyman-break galaxy (LBG) population it is possible to gain an insight into the role of environment in galaxy formation physics in the early Universe. We measure the clustering of a sample of bright ($-22.7
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WISE data as a photometric redshift indicator for radio AGN

Authors:

M Glowacki, Jr Allison, Em Sadler, Va Moss, Th Jarrett

Abstract:

We show that mid-infrared data from the all-sky WISE survey can be used as a robust photometric redshift indicator for powerful radio AGN, in the absence of other spectroscopic or multi-band photometric information. Our work is motivated by a desire to extend the well-known K-z relation for radio galaxies to the wavelength range covered by the all-sky WISE mid-infrared survey. Using the LARGESS radio spectroscopic sample as a training set, and the mid-infrared colour information to classify radio sources, we generate a set of redshift probability distributions for the hosts of high-excitation and low-excitation radio AGN. We test the method using spectroscopic data from several other radio AGN studies, and find good agreement between our WISE-based redshift estimates and published spectroscopic redshifts out to z ~ 1 for galaxies and z ~ 3-4 for radio-loud QSOs. Our chosen method is also compared against other classification methods and found to perform reliably. This technique is likely to be particularly useful in the analysis of upcoming large-area radio surveys with SKA pathfinder telescopes, and our code is publicly available. As a consistency check, we show that our WISE-based redshift estimates for sources in the 843 MHz SUMSS survey reproduce the redshift distribution seen in the CENSORS study up to z ~ 2. We also discuss two specific applications of our technique for current and upcoming radio surveys; an interpretation of large scale HI absorption surveys, and a determination of whether low-frequency peaked spectrum sources lie at high redshift.
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