GaLactic and Extragalactic All-sky Murchison Widefield Array eXtended (GLEAM-X) survey II: Second Data Release

TL;DR

The GLEAM-X survey's second data release provides a comprehensive radio source catalogue covering a large sky area at low frequencies, with high completeness and reliability, enabling new studies of the radio universe.

Contribution

This paper presents the second data release of the GLEAM-X survey, including a large, high-quality radio source catalogue and mosaics over a significant sky area at low frequencies.

Findings

Catalogue of 624,866 components with high completeness and reliability.

Wideband mosaics covering 170-231MHz available for research.

Survey covers 12,892 deg^2 around the South Galactic Pole.

Abstract

We present the second data release for the GaLactic and Extragalactic All-sky Murchison Widefield Array eXtended (GLEAM-X) survey. This data release is an area of 12,892-deg^2 around the South Galactic Pole region covering 20h 40m <= RA <= 6h 40m, -90deg <= Dec <= +30deg. Observations were taken in 2020 using the Phase-II configuration of the Murchison Widefield Array (MWA) and covering a frequency range of 72-231MHz with twenty frequency bands. We produce a wideband source-finding mosaic over 170-231MHz with a median root mean squared noise of 1.5 (+1.5/-0.5) mJy beam^(-1). We present a catalogue of 624,866 components, including 562,302 components which are spectrally fit. This catalogue is 98% complete at 50mJy, and a reliability of 98.7% at a 5sigma level, consistent with expectations for this survey. The catalogue is made available via Vizier and the PASA datastore and accompanying mosaics for this data release are made available via AAO Data Central and SkyView.