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Accepted manuscript

GLEAM-300: The GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey at 300 MHz

Published online by Cambridge University Press:  17 November 2025

S.W. Duchesne Open the ORCID record for S.W. Duchesne [Opens in a new window] ,
J.H. Cook ,
N. Hurley-Walker ,
A.J.M. Thomson Open the ORCID record for A.J.M. Thomson [Opens in a new window] ,
S. Paterson Open the ORCID record for S. Paterson [Opens in a new window] ,
C.J. Riseley ,
S.J. McSweeney ,
S. Mantovanini Open the ORCID record for S. Mantovanini [Opens in a new window] ,
G. Heald Open the ORCID record for G. Heald [Opens in a new window]  and
T. M. O. Franzen Open the ORCID record for T. M. O. Franzen [Opens in a new window]
...Show all authors
S.W. Duchesne*
Affiliation:
CSIRO Space and Astronomy, PO Box 1130, Bentley WA 6102, Australia
J.H. Cook
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia
N. Hurley-Walker
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
S. Paterson
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia
C.J. Riseley
Affiliation:
Astronomisches Institut der Ruhr-Universität Bochum (AIRUB), Universitätsstraße 150, 44801 Bochum, Germany
S.J. McSweeney
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia
S. Mantovanini
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia
G. Heald
Affiliation:
CSIRO Space and Astronomy, PO Box 1130, Bentley WA 6102, Australia SKA Observatory, SKA-Low Science Operations Centre, 26 Dick Perry Avenue, Kensington, WA 6151, Australia
T. M. O. Franzen
Affiliation:
SKA Observatory, Jodrell Bank, Lower Withington, Macclesfield SK11 9FT, UK
K. Ross
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia
N. Seymour
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia
R. B. Wayth
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia SKA Observatory, Science Operations Centre, CSIRO ARRC, 26 Dick Perry Avenue, Kensington, WA 6151, Australia
T. J. Galvin
Affiliation:
CSIRO Space and Astronomy, PO Box 1130, Bentley WA 6102, Australia
*
Author for correspondence: S. W. Duchesne, Email: Stefan.Duchesne@csiro.au.
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Abstract

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In this paper we present a wide-field radio survey at 300MHz covering the sky from using the Murchison Widefield Array (MWA). This 300-MHz survey follows the Galactic and Extragalactic All-sky MWA (GLEAM) survey, and provides an additional comparatively high-frequency data point to existing multi-frequency (72–231MHz) data. With this data release we provide mosaic images and a catalogue of compact source components. We use two-minute snapshot observations covering 2015–2016, combining overlapping two-minute snapshot images to provide full-sensitivity mosaic images with a median root-mean-square noise of mJybeam−1 and median angular resolution of , with some position-dependent variation. We find a total of 338080 unique Gaussian components across the mosaic images. The survey is the first at 300MHz from the MWA covering the whole Southern Hemisphere. It provides a unique spectral data point that complements the existing GLEAM survey and the ongoing GLEAM-eXtended survey, and points toward results from the upcoming SKA-Low surveys.

Keywords

techniques: interferometricgalaxies: generalradio continuum: generalsurveys

Information

Type
Research Article
Information
Publications of the Astronomical Society of Australia , Accepted manuscript , pp. 1 - 30
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Astronomical Society of Australia