WALLABY -- An SKA Pathfinder HI Survey
Abstract
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 < Dec < +30 degr) to a redshift of z < 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).
Cite
@article{arxiv.2002.07311,
title = {WALLABY -- An SKA Pathfinder HI Survey},
author = {B. S. Koribalski and L. Staveley-Smith and T. Westmeier and P. Serra and K. Spekkens and O. I. Wong and C. D. P. Lagos and D. Obreschkow and E. V. Ryan-Weber and M. Zwaan and V. Kilborn and G. Bekiaris and K. Bekki and F. Bigiel and A. Boselli and A. Bosma and B. Catinella and G. Chauhan and M. E. Cluver and M. Colless and H. M. Courtois and R. A. Crain and W. J. G. de Blok and H. Dénes and A. R. Duffy and A. Elagali and C. J. Fluke and B. -Q. For and G. Heald and P. A. Henning and K. M. Hess and B. W. Holwerda and C. Howlett and T. Jarrett and D. H. Jones and M. G. Jones and G. I. G. Józsa and R. Jurek and E. Jütte and P. Kamphuis and I. Karachentsev and J. Kerp and D. Keiner and R. C. Kraan-Korteweg and K. Lee-Waddell and A. R. López-Sánchez and J. Madrid and M. Meyer and J. Mould and C. Murugeshan and R. P. Norris and S. -H. Oh and T. A. Oosterloo and A. Popping and M. Putman and T. N. Reynolds and J. Rhee and A. S. G. Robotham and S. Ryder and A. C. Schröder and Li Shao and A. R. H. Stevens and E. N. Taylor and J. M. van der Hulst and L. Verdes-Montenegro and B. P. Wakker and J. Wang and M. Whiting and B. Winkel and C. Wolf},
journal= {arXiv preprint arXiv:2002.07311},
year = {2020}
}
Comments
Accepted for publication in ApSS (38 pages, 14 figures), see also https://www.atnf.csiro.au/research/WALLABY/ - Contact email: Baerbel.Koribalski@csiro.au