http://arxiv.org/abs/2204.12762
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 sq. deg over 4h < RA < 13h, -32.7deg < Dec < -20.7deg. We process twenty frequency bands sampling 72 – 231 MHz, with a resolution of $2’$ – $45″$, and produce a wideband source-finding image across 170 – 231MHz with a root-mean-square noise of $1.27\pm0.15$ mJy/beam. Source-finding yields 78,967 components, of which 71,320 are fitted spectrally. The catalogue has a completeness of 98% at $\sim50$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 on AAO Data Central, SkyView, and the PASA Datastore. This is the first in a series of data releases from the GLEAM-X survey.
N. Hurley-Walker, T. Galvin, S. Duchesne, et. al.
Thu, 28 Apr 22
35/70
Comments: 34 pages, 21 figures, 3 tables, accepted for publication in Publications of the Astronomical Society of Australia (PASA)
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