WALLABY Pilot Survey: Hydra Cluster Galaxies UV and HI morphometrics

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Benne W. Holwerda Frank Bigiel Albert Bosma Helene M. Courtois Nathan Deg Helga Dénes Ahmed Elagali Bi-Qing For Baerbel Koribalski Denis A. Leahy Karen Lee-Waddell Ángel R. López-Sánchez Se-Heon Oh Tristan N. Reynolds Jonghwan Rhee Kristine Spekkens Jing Wang Tobias Westmeier O. Ivy Wong

摘要： Galaxy morphology in atomic hydrogen (HI) and in the ultra-violet (UV) are closely linked. This has motivated their combined use to quantify morphology over the full H i disk 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 center. Taking advantage of this new HI survey, we apply the same morphometrics over the full HI extent on archival GALEX FUV and NUV data to explore how well HI truncated, extended ultraviolet disk (XUV) and other morphological phenomena can be captured using pipeline WALLABY data products. Extended HI and UV disks can be identified relatively straightforward from their respective concentration. Combined with WALLABY HI, even the shallowest GALEX data is sufficient to identify XUV disks. 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% precision and recall are possible with the Random Forest giving the most robust results.

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