GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey III: South Galactic Pole data release

T. M.O. Franzen, N. Hurley-Walker, S. V. White, P. J. Hancock, N. Seymour, A. D. Kapińska, L. Staveley-Smith, R. B. Wayth

Research output: Contribution to journalArticle

Abstract

We present the South Galactic Pole (SGP) data release from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. These data combine both years of GLEAM observations at 72-231 MHz conducted with the Murchison Widefield Array (MWA) and cover an area of 5 113 centred on the SGP at <![CDATA[$20 40 < and <![CDATA[$-48 <. At 216 MHz, the typical rms noise is mJy beam-1 and the angular resolution arcmin. The source catalogue contains a total of 108 851 components above, of which 77% have measured spectral indices between 72 and 231 MHz. Improvements to the data reduction in this release include the use of the GLEAM Extragalactic catalogue as a sky model to calibrate the data, a more efficient and automated algorithm to deconvolve the snapshot images, and a more accurate primary beam model to correct the flux scale. This data release enables more sensitive large-scale studies of extragalactic source populations as well as spectral variability studies on a one-year timescale.

Original languageEnglish
Article numbere014
JournalPublications of the Astronomical Society of Australia
DOIs
Publication statusE-pub ahead of print - 6 Apr 2021

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