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Accepted manuscript

The Rapid ASKAP Continuum Survey (RACS) VI: The RACS-high 1 655.5 MHz images and catalogue

Published online by Cambridge University Press:  03 February 2025

S. W. Duchesne Open the ORCID record for S. W. Duchesne [Opens in a new window] ,
K. Ross ,
A. J. M. Thomson Open the ORCID record for A. J. M. Thomson [Opens in a new window] ,
E. Lenc Open the ORCID record for E. Lenc [Opens in a new window] ,
Tara Murphy Open the ORCID record for Tara Murphy [Opens in a new window] ,
T. J. Galvin ,
A. W. Hotan Open the ORCID record for A. W. Hotan [Opens in a new window] ,
V. A. Moss Open the ORCID record for V. A. Moss [Opens in a new window]  and
Matthew T. Whiting
S. W. Duchesne*
Affiliation:
CSIRO Space and Astronomy, PO Box 1130, Bentley WA 6102, Australia
K. Ross
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia
A. J. M. Thomson
Affiliation:
CSIRO Space and Astronomy, PO Box 1130, Bentley WA 6102, Australia
E. Lenc
Affiliation:
CSIRO Space and Astronomy, PO Box 76, Epping, NSW, 1710, Australia
Tara Murphy
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
T. J. Galvin
Affiliation:
CSIRO Space and Astronomy, PO Box 1130, Bentley WA 6102, Australia
A. W. Hotan
Affiliation:
CSIRO Space and Astronomy, PO Box 1130, Bentley WA 6102, Australia
V. A. Moss
Affiliation:
CSIRO Space and Astronomy, PO Box 76, Epping, NSW, 1710, Australia Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
Matthew T. Whiting
Affiliation:
CSIRO Space and Astronomy, PO Box 76, Epping, NSW, 1710, Australia
*
Author for correspondence: S. W. Duchesne, Email: Stefan.Duchesne@csiro.au.
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Abstract

We have conducted a widefield, wideband, snapshot survey using the Australian SKA Pathfinder (ASKAP) referred to as the Rapid ASKAP Continuum Survey (RACS). RACS covers ≈ 90% of the sky, with multiple observing epochs in three frequency bands sampling the ASKAP frequency range of 700–1 800 MHz. This paper describes the third major epoch at 1 655.5 MHz, RACS-high, and the subsequent imaging and catalogue data release. The RACS-high observations at 1 655.5MHz are otherwise similar to the previously released RACS-mid (at 1367.5 MHz), and were calibrated and imaged with minimal changes. From the 1 493 images covering the sky up to declination ≈ +48°, we present a catalogue of 2 677 509 radio sources. The catalogue is constructed from images with a median root-mean-square noise of ≈ 195 μJy PSF−1 (point-spread function) and a median angular resolution of 11″. 8 × 8″. 1. The overall reliability of the catalogue is estimated to be 99.18 %, and we find a decrease in reliability as angular resolution improves. We estimate the brightness scale to be accurate to 10 %, and the astrometric accuracy to be within ≈ 0″. 6 in right ascension and ≈ 0″. 7 in declination after correction of a systematic declination-dependent offset. All data products from RACS-high, including calibrated visibility datasets, images from individual observations, full-sensitivity mosaics, and the all-sky catalogue are available at the CSIRO ASKAP Science Data Archive.

Keywords

cataloguessurveysradio continuumgeneralradio continuum: galaxies
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Accepted manuscript , pp. 1 - 22
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Astronomical Society of Australia

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