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16th of August 2023
ATNF Colloquium
HI surveys with next generation radio telescopes
Virginia Kilborn (Swinburne)
Abstract: Hydrogen is the most common element in the Universe. Powering star formation, it plays a crucial role in the formation and evolution of galaxies. Observations of Neutral Hydrogen (HI) in the radio wavelength allow us to survey for galaxies in the nearby universe, and next generation surveys from telescopes such as the Australian Square Kilometre Array Pathfinder (ASKAP), meerKAT and FAST are expected to provide redshifts, kinematics and gas content of around hundreds of thousands of galaxies, and probe the gaseous environment surrounding - and inbetween - galaxies. In this talk I'll provide an overview of HI science, what we've learnt to date, and touch on some of the potential future results of these new telescopes.
This image is from Kilborn et al 2000 - An extragalactic HI cloud with no Optical Counterpart? Next generation radio telescopes such as ASKAP and meerKAT are able to probe intergalactic space at much higher resolution - and better sensitivity, than previous telescopes, so we will start to build a more complete picture of where the neutral atomic hydrogen lies outside of galaxies.

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