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

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 ${\mathrm{deg}}^2$ centred on the SGP at 20${}^{\mathrm{h}}$40${}^{\mathrm{m}}$ < RA < 05${}^{\mathrm{h}}$04${}^{\mathrm{m}}$ and $-48°$ < Dec < $-2°$. At 216 MHz, the typical rms noise is $\approx 5$ mJy/beam and the angular resolution $\approx 2$ arcmin. The source catalogue contains a total of 108,851 components above $5\sigma$, of which 77 per cent 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.

arXiv comment13 pages, 7 figures, accepted for publication in PASA. Added link to images and source catalogue from GLEAM SGP data release in section 5. Corrected some mistakes in column numbers in section 4.5 describing catalogue. The catalogue is now also available on VizieR

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