WALLABY Pilot Survey: Gas-rich Galaxy Scaling Relations from Marginally Resolved Kinematic Models

December 2024 • 2024ApJ...976..159D

Authors • Deg, N. • Arora, N. • Spekkens, K. • Halloran, R. • Catinella, B. • Jones, M. G. • Courtois, H. • Glazebrook, K. • Bosma, A. • Cortese, L. • Dénes, H. • Elagali, A. • For, B.-Q. • Kamphuis, P. • Koribalski, B. S. • Lee-Waddell, K. • Mancera Piña, P. E. • Mould, J. • Rhee, J. • Shao, L. • Staveley-Smith, L. • Wang, J. • Westmeier, T. • Wong, O. I.

Abstract • We present the first set of galaxy scaling relations derived from kinematic models of the Widefield Australian Square Kilometer Array Pathfinder (ASKAP) L-band Legacy All-sky Blind surveY (WALLABY) pilot phase observations. Combining the results of the first and second pilot data releases, there are 236 available kinematic models. We develop a framework for robustly measuring H I disk structural properties from these kinematic models, applicable to the full WALLABY survey. Utilizing this framework, we obtained the H I size, a measure of the rotational velocity, and angular momentum for 148 galaxies. These comprise the largest sample of galaxy properties from an untargeted, uniformly observed, and modeled H I survey to date. We study the neutral atomic hydrogen (H I) size─mass, size─velocity, mass─velocity, and angular momentum─mass scaling relations. We calculate the slope, intercept, and scatter for these scaling relations and find that they are similar to those obtained from other H I surveys. We also obtain stellar masses for 92 of the 148 robustly measured galaxies using multiband photometry through Dark Energy Sky Instrument Legacy Imaging Survey Data Release 10 images. We use a subset of 61 of these galaxies that have consistent optical and kinematic inclinations to examine the stellar and baryonic Tully─Fisher relations as well as the gas fraction─disk stability and gas fraction─baryonic mass relations. These measurements and relations demonstrate the unprecedented resource that WALLABY will represent for resolved galaxy scaling relations in H I.

Links

• SIMBAD https://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2024ApJ...976..159D
• PDF https://iopscience.iop.org/article/10.3847/1538-4357/ad84ba/pdf
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/2024ApJ...976..159D
• PREPRINT http://arxiv.org/abs/2411.06993
• ELECTR https://doi.org/10.3847/1538-4357/ad84ba