WALLABY Pilot Survey: hydra cluster galaxies UV and H I morphometrics
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, M20 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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 2023
- DOI:
- 10.1093/mnras/stad602
- arXiv:
- arXiv:2302.07963
- Bibcode:
- 2023MNRAS.521.1502H
- Keywords:
-
- galaxies: disc;
- galaxies: ISM;
- galaxies: kinematics and dynamics;
- galaxies: spiral;
- galaxies: statistics;
- galaxies: structure;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 17 figures, 12 figures, 7 tables, accepted by MNRAS