Koribalski, BS, Staveley-Smith, L, Westmeier, T, Serra, P, Spekkens, K, Wong, O, Lee-Waddell, K, Lagos, CDP, Obreschkow, D, Ryan-Weber, E, Zwaan, M, Kilborn, V, Bekiaris, G, Bekki, K, Bigiel, F, Boselli, A, Bosma, A, Catinella, B, Chauhan, G, Cluver, ME et al, Colless, M, Courtois, HM, Crain, RA, de Blok, WJG, Denes, H, Duffy, AR, Elagali, A, Fluke, CJ, For, B-Q, Heald, G, Henning, PA, Hess, KM, Holwerda, BW, Howlett, C, Jarrett, T, Jones, DH, Jones, MG, Jozsa, GIG, Jurek, R, Juette, E, Kamphuis, P, Karachentsev, I, Kerp, J, Kleiner, D, Kraan-Korteweg, RC, Lopez-Sanchez, AR, Madrid, J, Meyer, M, Mould, J, Murugeshan, C, Norris, RP, Oh, S-H, Oosterloo, TA, Popping, A, Putman, M, Reynolds, TN, Rhee, J, Robotham, ASG, Ryder, S, Schroder, AC, Shao, L, Stevens, ARH, Taylor, EN, van der Hulst, JM, Verdes-Montenegro, L, Wakker, BP, Wang, J, Whiting, M, Winkel, B and Wolf, C (2020) WALLABY - an SKA Pathfinder Hi survey. Astrophysics and Space Science, 365 (7). ISSN 0004-640X

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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 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).

Item Type:	Article
Additional Information:	This is a post-peer-review, pre-copyedit version of an article published in Astrophysics and Space Science. The final authenticated version is available online at: http://dx.doi.org/10.1007/s10509-020-03831-4
Uncontrolled Keywords:	0201 Astronomical and Space Sciences
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	Springer
Related URLs:	Author
Date Deposited:	20 Apr 2021 10:42
Last Modified:	04 Sep 2021 05:34
DOI or ID number:	10.1007/s10509-020-03831-4
URI:	https://researchonline.ljmu.ac.uk/id/eprint/14829

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