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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 (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: | |
| Date of acceptance: | 3 July 2020 |
| Date of first compliant Open Access: | 13 July 2021 |
| 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://ljmu-9.eprints-hosting.org/id/eprint/14829 |
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