| 21st of September 2022 |
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| ATNF Colloquium |
| Hopping into a new era of extragalactic radio astronomy with WALLABY |
| Tristan Reynolds (ICRAR/UWA) |
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Abstract:
Neutral hydrogen (HI) gas provides the reservoir for future star
formation and is important to understanding how galaxies form and
evolve. HI in galaxies is abundant, relatively easy to detect and
provides a wealth of information on the host galaxy including
distance, mass and density, motion (e.g. rotation) and the influence
of the local environment. Current HI datasets are limited in the total
number of galaxies detected and spatial resolution, but this is about
to change thanks to the next-generation HI surveys on Square Kilometre
Array pathfinders, including WALLABY. WALLABY will be transformational
in our understanding of the HI content of galaxies through detecting
~210,000 galaxies in HI and spatially resolving HI in several thousand
of galaxies over the Southern sky. I will provide an update on the
current status of the WALLABY survey. I will also present some of my
recent WALLABY results in which I take advantage of the spatial
resolution to study the interplay between environment, HI content and
galaxies' stellar and star forming quantities.
The figure above shows some example galaxies detected with WALLABY in and around the Hydra cluster (the optical galaxy images have overlaid contours showing the optical and HI disc sizes). As Thursday 22 September is a public holiday in Australia, the next ADAP will appear on Friday 23 September. |