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17th of March 2015
The ASKAP HI All Sky Survey
by Bärbel Koribalski (CASS)
WALLABY is the "ASKAP HI All-Sky Survey", a precursor for future, much deeper SKA Phase 1 & Phase 2 neutral hydrogen (HI) surveys. With an integration time of ~1 year (or 8 hours per pointing) WALLABY will cover two-thirds of the sky to redshifts of z = 0.25. Using our best source-finding algorithms - now available as part of SoFiA (Serra et al. 2015) - we estimate that in the survey volume around 600 000 galaxies are individually detectable in the 21-cm line of neutral atomic hydrogen (e.g., Duffy et al. 2012). We will measure the HI properties of each galaxy and derive its distance, HI mass, total mass and dark matter content. The vast majority of these galaxies will also be detected in the 20-cm radio continuum, obtained as part of the same survey, allowing us to derive their unobscured star-formation rates. The 30 arcsec angular resolution of WALLABY will allow us to identify likely optical and/or infrared galaxy counterparts. The WALLABY team consists of ~80 researchers from around the world, led by Bärbel Koribalski (CSIRO Astronomy and Space Science) and Lister Staveley-Smith (UWA/ICRAR). For a brief overview of WALLABY see Koribalski (2012).

SKA Pathfinder HI surveys, including WALLABY, are being discussed today at the 8th PHISCC Workshop.

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