Cluver, M.E.Koribalski, Bärbel S.Staveley-Smith, L.2021-02-082021-02-082020Koribalski, B.S., Staveley-Smith, L., Westmeier, T. et al. WALLABY – an SKA Pathfinder H I survey. Astrophys Space Sci 365, 118 (2020).https://doi.org/10.1007/s10509-020-03831-4http://hdl.handle.net/10566/5844The Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) is a next-generation survey of neutral hydrogen (H I) in the Local Universe. It uses the widefield, high-resolution capability of the Australian Square Kilometer Array Pathfinder (ASKAP), a radio interferometer consisting of 36 × 12-m dishes equipped with Phased-Array Feeds (PAFs), located in an extremely radioquiet zone in Western Australia. WALLABY aims to survey three-quarters of the sky (−90◦ < δ <+30◦) to a redshift of z 0.26, and generate spectral line image cubes at ∼30 arcsec resolution and ∼1.6 mJy beam−1 per 4 kms−1 channel sensitivity. ASKAP’s instantaneous field of view at 1.4 GHz, delivered by the PAF’s 36 beams, is about 30 sq deg. At an integrated signal-to-noise ratio of five, WALLABY is expected to detect around half a million galaxies with a mean redshift of z ∼ 0.05 (∼200 Mpc).enRadio lines: galaxiesISM – surveys – galaxiesEvolutionKinematics & dynamicsISM – large-scale structureArticle