WALLABY Pilot Survey: Hydra Cluster Galaxies UV and H Imorphometrics
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY(2023)
Univ Louisville | Univ Bonn | Aix Marseille Univ | Univ Lyon | Queens Univ | Netherlands Inst Radio Astron | Univ Western Australia | ARC Ctr Excellence Astrophys 3 Dimens ASTRO 3D | Univ Calgary | Sejong Univ | Royal Mil Coll Canada | Peking Univ
Abstract
Galaxy morphology in atomic hydrogen (H i) and in the ultraviolet (UV) are closely linked. This has motivated their combined use to quantify morphology over the full H i disc for both H i and UV imaging. We apply galaxy morphometrics: concentration, asymmetry, gini, M-20 and multimode-intensity-deviation statistics to the first moment-0 maps of the WALLABY Survey of galaxies in the hydra cluster centre. Taking advantage of this new H i survey, we apply the same morphometrics over the full H i extent on archival GALEX FUV and NUV data to explore how well H i truncated, extended ultraviolet disc (XUV) and other morphological phenomena can be captured using pipeline WALLABY data products. Extended H i and UV discs can be identified relatively straightforward from their respective concentration. Combined with WALLABY H i, even the shallowest GALEX data are sufficient to identify XUV discs. Our second goal is to isolate galaxies undergoing ram-pressure stripping in the H i morphometric space. We employ four different machine learning techniques, a decision tree, a k-nearest neighbour, a support-vector machine, and a random forest. Up to 80 per cent precision and recall are possible with the random forest giving the most robust results.
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Key words
galaxies: disc,galaxies: ISM,galaxies: kinematics and dynamics,galaxies: spiral,galaxies: statistics,galaxies: structure
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