WALLABY - an SKA Pathfinder HI survey
Journal
Date Issued
2020
Author(s)
Koribalski, Bärbel S.
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Staveley-Smith, L.
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Westmeier, T.
•
•
Spekkens, K.
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Wong, O.~I.
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Lee-Waddell, K.
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Lagos, C.~D.~P.
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Obreschkow, D.
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Ryan-Weber, E.~V.
•
Zwaan, M.
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Kilborn, V.
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Bekiaris, G.
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Bekki, K.
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Bigiel, F.
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Boselli, A.
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Bosma, A.
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Catinella, B.
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Chauhan, G.
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Cluver, M.~E.
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Colless, M.
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Courtois, H.~M.
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Crain, R.~A.
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de Blok, W.~J.~G.
•
Dénes, H.
•
Duffy, A.~R.
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Elagali, A.
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Fluke, C.~J.
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For, B. -Q.
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Heald, G.
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Henning, P.~A.
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Hess, K.~M.
•
Holwerda, B.~W.
•
Howlett, C.
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Jarrett, T.
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Jones, D.~H.
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Jones, M.~G.
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Józsa, G.~I.~G.
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Jurek, R.
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Jütte, E.
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Kamphuis, P.
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Karachentsev, I.
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Kerp, J.
•
•
Kraan-Korteweg, R.~C.
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López-Sánchez, Á. R.
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Madrid, J.
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Meyer, M.
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Mould, J.
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Murugeshan, C.
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Norris, R.~P.
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Oh, S. -H.
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Oosterloo, T.~A.
•
Popping, A.
•
Putman, M.
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Reynolds, T.~N.
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Rhee, J.
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Robotham, A.~S.~G.
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Ryder, S.
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Schröder, A.~C.
•
Shao, Li
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Stevens, A.~R.~H.
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Taylor, E.~N.
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van̂A der Hulst, J.~M.
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Verdes-Montenegro, L.
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Wakker, B.~P.
•
Wang, J.
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Whiting, M.
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Winkel, B.
•
Wolf, C.
Abstract
The 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 -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 () to a redshift of , and generate spectral line image cubes at ∼30 arcsec resolution and ∼1.6 mJy beam−1 per 4 km s−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 (∼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 H i 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 recent and planned large-scale H i 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).
Volume
365
Issue
7
Issn Identifier
0004-640X
Rights
open.access
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