WALLABY Pre-Pilot and Pilot Survey: the Tully Fisher Relation in Eridanus, Hydra, Norma and NGC4636 fields - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2023

WALLABY Pre-Pilot and Pilot Survey: the Tully Fisher Relation in Eridanus, Hydra, Norma and NGC4636 fields

Khaled Said
  • Function : Author
Jeremy Mould
  • Function : Author
T. H. Jarrett
  • Function : Author
Daniel Pomarède
  • Function : Author
Tobias Westmeier
  • Function : Author
Lister Staveley-Smith
  • Function : Author
Tao Hong
  • Function : Author
Cullan Howlett
  • Function : Author
Nathan Deg
  • Function : Author
Bi-Qing For
  • Function : Author
Dane Kleiner
  • Function : Author
Bärbel Koribalski
  • Function : Author
Karen Lee-Waddell
  • Function : Author
Jonghwan Rhee
  • Function : Author
Kristine Spekkens
  • Function : Author
Jing Wang
  • Function : Author
O. I. Wong
  • Function : Author
Frank Bigiel
  • Function : Author
Albert Bosma
Matthew Colless
  • Function : Author
Tamara Davis
  • Function : Author
Benne Holwerda
  • Function : Author
Igor Karachentsev
  • Function : Author
Renée C. Kraan-Korteweg
  • Function : Author
Kristen B. W. Mcquinn
  • Function : Author
Gerhardt Meurer
  • Function : Author
Danail Obreschkow
  • Function : Author
Edward Taylor
  • Function : Author

Abstract

The WALLABY pilot survey has been conducted using the Australian SKA Pathfinder (ASKAP). The integrated 21-cm HI line spectra are formed in a very different manner compared to usual single-dish spectra Tully-Fisher measurements. It is thus extremely important to ensure that slight differences (e.g. biases due to missing flux) are quantified and understood in order to maximise the use of the large amount of data becoming available soon. This article is based on four fields for which the data are scientifically interesting by themselves. The pilot data discussed here consist of 614 galaxy spectra at a rest wavelength of 21cm. Of these spectra, 472 are of high enough quality to be used to potentially derive distances using the Tully-Fisher relation. We further restrict the sample to the 251 galaxies whose inclination is sufficiently close to edge-on. For these, we derive Tully-Fisher distances using the deprojected WALLABY velocity widths combined with infrared (WISE W1) magnitudes. The resulting Tully-Fisher distances for the Eridanus, Hydra, Norma and NGC 4636 clusters are 21.5, 53.5, 69.4 and 23.0 Mpc respectively, with uncertainties of 5-10%, which are better or equivalent to the ones obtained in studies using data obtained with giant single dish telescopes. The pilot survey data show the benefits of WALLABY over previous giant single-dish telescope surveys. WALLABY is expected to detect around half a million galaxies with a mean redshift of z = 0.05(200Mpc). This study suggests that about 200,000 Tully-Fisher distances might result from the survey.
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Dates and versions

insu-03863222 , version 1 (12-07-2023)

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Hélène M. Courtois, Khaled Said, Jeremy Mould, T. H. Jarrett, Daniel Pomarède, et al.. WALLABY Pre-Pilot and Pilot Survey: the Tully Fisher Relation in Eridanus, Hydra, Norma and NGC4636 fields. Monthly Notices of the Royal Astronomical Society, 2023, 519, pp.4589-4607. ⟨10.1093/mnras/stac3246⟩. ⟨insu-03863222⟩
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