Measuring cosmic density of neutral hydrogen via stacking the DINGO-VLA data

Qingxiang Chen, Martin Meyer, Attila Popping, Lister Staveley-Smith, Julia Bryant, Jacinta Delhaize, B W Holwerda, M E Cluver, J Loveday, Angel R Lopez-Sanchez, Martin Zwaan, E N Taylor, A M Hopkins, Angus Wright, Simon Driver, S Brough

Research output: Contribution to journalArticlepeer-review


We use the 21-cm emission-line data from the Deep Investigation of Neutral Gas Origin-Very Large Array (DINGO-VLA) project to study the atomic hydrogen gas H I of the Universe at redshifts z< 0.1. Results are obtained using a stacking analysis, combining the H I signals from 3622 galaxies extracted from 267 VLA pointings in the G09 field of the Galaxy and Mass Assembly Survey (GAMA). Rather than using a traditional one-dimensional spectral stacking method, a three-dimensional cubelet stacking method is used to enable deconvolution and the accurate recovery of average galaxy fluxes from this high-resolution interferometric data set. By probing down to galactic scales, this experiment also overcomes confusion corrections that have been necessary to include in previous single-dish studies. After stacking and deconvolution, we obtain a 30σ H I mass measurement from the stacked spectrum, indicating an average H I mass of MHI=(1.67±0.18)×109 MMHI=(1.67±0.18)×109 M⁠. The corresponding cosmic density of neutral atomic hydrogen is ΩHI=(0.38±0.04)×10−3 at redshift of z = 0.051. These values are in good agreement with earlier results, implying there is no significant evolution of ΩHI at lower redshifts.
Original languageEnglish
Pages (from-to)2758-2770
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Early online date2 Oct 2021
Publication statusPublished - Dec 2021


  • Galaxies: star formation
  • Radio lines: galaxies
  • ISM: atoms


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