July
2020
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2020Ap&SS.365..118K
Authors
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Koribalski, Bärbel S.
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Staveley-Smith, L.
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Westmeier, T.
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Serra, P.
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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.
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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.
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Dénes, H.
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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.
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Holwerda, B. W.
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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.
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Kleiner, D.
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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.
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Popping, A.
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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.
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Shao, Li
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Stevens, A. R. H.
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Taylor, E. N.
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van der Hulst, J. M.
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Verdes-Montenegro, L.
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Wakker, B. P.
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Wang, J.
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Whiting, M.
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Winkel, B.
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Wolf, C.
Abstract
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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 36×12-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∘<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 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 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 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).
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