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Peer-reviewedCC BY 4.0Monthly Notices of the Royal Astronomical Society

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

  • Shinna Kim1,2
  • Tobias Westmeier1,2
  • Lister Staveley-Smith1,2
  • Danail Obreschkow1,2
  • Barbara Catinella1,2
  • Nathan Deg3
  • Karen Lee-Waddell4,5
  • Jonghwan Rhee1,5
  • Kristine Spekkens3
  • O Ivy Wong1,5
  • Matthew Colless6
  • Hélène M Courtois7
2 more authors
  • Boyi Ding6
  • Bumhyun Lee8
8 affiliations
  1. 1International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia , 35 Stirling Hwy, Crawley, WA 6009 ,
  2. 2ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
  3. 3Engineering Physics and Astronomy, Queen’s University Department of Physics, , 64 Bader Lane, Kingston, Ontario, K7L 3N6 ,
  4. 4Australian SKA Regional Centre (AusSRC) - The University of Western Australia , 35 Stirling Highway, Crawley WA 6009 ,
  5. 5Australia Telescope National Facility , CSIRO Space & Astronomy, P.O. Box 1130, Bentley, WA 6102 ,
  6. 6Research School of Astronomy and Astrophysics, Australian National University , Canberra, ACT ,
  7. 7Université Claude Bernard Lyon 1 , IUF, IP2I Lyon, 4 rue Enrico Fermi, 69622 Villeurbanne ,
  8. 8Yonsei University Department of Astronomy, , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722 ,
Open at sourcePDFDOICite

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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Cite

BibTeXRIS
BibTeX
@article{kim2026wallaby,
  title = {{WALLABY pilot survey: accurate and automated linewidth measurements from global H i profiles}},
  author = {Shinna Kim and Tobias Westmeier and Lister Staveley-Smith and Danail Obreschkow and Barbara Catinella and Nathan Deg and Karen Lee-Waddell and Jonghwan Rhee and Kristine Spekkens and O Ivy Wong and Matthew Colless and Hélène M Courtois and Boyi Ding and Bumhyun Lee},
  journal = {Monthly Notices of the Royal Astronomical Society},
  year = {2026},
  month = oct,
  doi = {10.1093/mnras/stag1949},
  url = {https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag1949/8931746},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - WALLABY pilot survey: accurate and automated linewidth measurements from global H i profiles
AU  - Shinna Kim
AU  - Tobias Westmeier
AU  - Lister Staveley-Smith
AU  - Danail Obreschkow
AU  - Barbara Catinella
AU  - Nathan Deg
AU  - Karen Lee-Waddell
AU  - Jonghwan Rhee
AU  - Kristine Spekkens
AU  - O Ivy Wong
AU  - Matthew Colless
AU  - Hélène M Courtois
AU  - Boyi Ding
AU  - Bumhyun Lee
PY  - 2026
DA  - 2026/10/16
JO  - Monthly Notices of the Royal Astronomical Society
DO  - 10.1093/mnras/stag1949
UR  - https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag1949/8931746
AB  - 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.
SN  - 0035-8711
SN  - 1365-2966
ER  -