WALLABY -- An SKA Pathfinder HI Survey
Creators: name: Koribalski, B. S.
name: Staveley-Smith, L.
name: Westmeier, T.
name: Serra, P.
name: Spekkens, K.
name: Wong, O. I.
name: Lagos, C. D. P.
name: Obreschkow, D.
name: Ryan-Weber, E. V.
name: Zwaan, M.
name: Kilborn, V.
name: Bekiaris, G.
name: Bekki, K.
name: Bigiel, F.
name: Boselli, A.
name: Bosma, A.
name: Catinella, B.
name: Chauhan, G.
name: Cluver, M. E.
name: Colless, M.
name: Courtois, H. M.
name: Crain, R. A.
name: de Blok, W. J. G.
name: Dénes, H.
name: Duffy, A. R.
name: Elagali, A.
name: Fluke, C. J.
name: For, B. -Q.
name: Heald, G.
name: Henning, P. A.
name: Hess, K. M.
name: Holwerda, B. W.
name: Howlett, C.
name: Jarrett, T.
name: Jones, D. H.
name: Jones, M. G.
name: Józsa, G. I. G.
name: Jurek, R.
name: Jütte, E.
name: Kamphuis, P.
name: Karachentsev, I.
name: Kerp, J.
name: Keiner, D.
name: Kraan-Korteweg, R. C.
name: Lee-Waddell, K.
name: López-Sánchez, A. R.
name: Madrid, J.
name: Meyer, M.
name: Mould, J.
name: Murugeshan, C.
name: Norris, R. P.
name: Oh, S. -H.
name: Oosterloo, T. A.
name: Popping, A.
name: Putman, M.
name: Reynolds, T. N.
name: Rhee, J.
name: Robotham, A. S. G.
name: Ryder, S.
name: Schröder, A. C.
name: Shao, Li
name: Stevens, A. R. H.
name: Taylor, E. N.
name: van der Hulst, J. M.
name: Verdes-Montenegro, L.
name: Wakker, B. P.
name: Wang, J.
name: Whiting, M.
name: Winkel, B.
name: Wolf, C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) is a next-generation survey of neutral hydrogen (HI) 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 x 12-m dishes equipped with Phased-Array Feeds (PAFs), located in an extremely radio-quiet zone in Western Australia. WALLABY aims to survey three-quarters of the sky (-90 degr &lt; Dec &lt; +30 degr) to a redshift of z &lt; 0.26, and generate spectral line image cubes at ~30 arcsec resolution and ~1.6 mJy/beam per 4 km/s 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 over half a million galaxies with a mean redshift of z ~ 0.05 (~200 Mpc). The scientific goals of WALLABY include: (a) a census of gas-rich galaxies in the vicinity of the Local Group; (b) a study of the HI properties of galaxies, groups and clusters, in particular the influence of the environment on galaxy evolution; and (c) the refinement of cosmological parameters using the spatial and redshift distribution of low-bias gas-rich galaxies. For context we provide an overview of previous large-scale HI surveys. Combined with existing and new multi-wavelength sky surveys, WALLABY will enable an exciting new generation of panchromatic studies of the Local Universe. - First results from the WALLABY pilot survey are revealed, with initial data products publicly available in the CSIRO ASKAP Science Data Archive (CASDA).
description: Accepted for publication in ApSS (38 pages, 14 figures), see also https://www.atnf.csiro.au/research/WALLABY/ - Contact email: Baerbel.Koribalski@csiro.au