GaLactic and Extragalactic All-sky Murchison Widefield Array survey eXtended (GLEAM-X) I: Survey description and initial data release
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Published:2022
Issue:
Volume:39
Page:
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ISSN:1323-3580
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Container-title:Publications of the Astronomical Society of Australia
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language:en
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Short-container-title:Publ. Astron. Soc. Aust.
Author:
Hurley-Walker N.ORCID, Galvin T. J.ORCID, Duchesne S. W.ORCID, Zhang X.ORCID, Morgan J.ORCID, Hancock P. J.ORCID, An T.ORCID, Franzen T. M. O.ORCID, Heald G.ORCID, Ross K.ORCID, Vernstrom T.ORCID, Anderson G. E.ORCID, Gaensler B. M.ORCID, Johnston-Hollitt M.ORCID, Kaplan D. L., Riseley C. J.ORCID, Tingay S. J.ORCID, Walker M.
Abstract
Abstract
We describe a new low-frequency wideband radio survey of the southern sky. Observations covering 72–231 MHz and Declinations south of
$+30^\circ$
have been performed with the Murchison Widefield Array “extended” Phase II configuration over 2018–2020 and will be processed to form data products including continuum and polarisation images and mosaics, multi-frequency catalogues, transient search data, and ionospheric measurements. From a pilot field described in this work, we publish an initial data release covering 1,447
$\mathrm{deg}^2$
over
$4\,\mathrm{h}\leq \mathrm{RA}\leq 13\,\mathrm{h}$
,
$-32.7^\circ \leq \mathrm{Dec} \leq -20.7^\circ$
. We process twenty frequency bands sampling 72–231 MHz, with a resolution of 2′–45′′, and produce a wideband source-finding image across 170–231 MHz with a root mean square noise of
$1.27\pm0.15\,\mathrm{mJy\,beam}^{-1}$
. Source-finding yields 78,967 components, of which 71,320 are fitted spectrally. The catalogue has a completeness of 98% at
${{\sim}}50\,\mathrm{mJy}$
, and a reliability of 98.2% at
$5\sigma$
rising to 99.7% at
$7\sigma$
. A catalogue is available from Vizier; images are made available via the PASA datastore, AAO Data Central, and SkyView. This is the first in a series of data releases from the GLEAM-X survey.
Publisher
Cambridge University Press (CUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Reference96 articles.
1. Dolfi, A. , Branchini, E. , Bilicki, M. , Balaguera-Antolnez, A. , Prandoni, I. , & Pandit, R. 2019, A&A, 623, A148 2. Norris, R. P. , et al. 2021, PASA, 38, e046 3. Tingay, S. J. , et al. 2013, PASA, 30, 7 4. Bock, D. C. J. , Large, M. I. , & Sadler, E. M. 1999, AJ, 117, 1578 5. Hurley-Walker, N. , et al. 2019b, PASA, 36, e047
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