WALLABY pilot survey: accurate and automated linewidth measurements from global H i profiles

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ID: 332544
2026
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Abstract
Abstract Current-generation 21-cm surveys of extragalactic neutral hydrogen (H i) with instruments such as FAST and ASKAP are providing detailed spectral and spatial information for over 105 galaxies. Future H i surveys with next-generation radio telescopes could provide sample sizes larger by orders of magnitude. There is therefore a need for accurate, automated, and reliable parameterisation of the H i emission from galaxies. We have developed an automated estimator for H i global profile widths to better enable studies of, for example, dynamical masses and Tully-Fisher distances. Our estimator is based on an implementation of the BusyFit profile-fitting algorithm, and converges for 95 % of global profiles in the WALLABY pilot survey. Probability density functions are calculated for all profile parameters using Monte Carlo techniques, and example error parameterisations are given. We confirm that linewidth uncertainties depend primarily on the integrated signal-to-noise ratio, profile steepness, and the linewidth, consistent with previous studies. We compare several common linewidth definitions, and the width at 50 % of the mean flux density (Wm50) is found to be the most robust measure of linewidth. We provide examples of the baryonic Tully-Fisher relation drawn from the WALLABY pilot survey.
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Authors Shinna Kim, T. Westmeier, Lister Staveley‐Smith, Danail Obreschkow, Barbara Catinella, Nathan Deg, K. Lee-Waddell, Jonghwan Rhee, Kristine Spekkens, O. Ivy Wong, Matthew Colless, Hélène M. Courtois, Boyi Ding, Bumhyun Lee
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1949
URL
https://doi.org/10.1093/mnras/stag1949
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