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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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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 MH I = (1.67 ± 0.18) × 109 M. The corresponding cosmic density of neutral atomic hydrogen is ΩH I = (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 ΩH I at lower redshifts.

Original languageEnglish
Pages (from-to)2758-2770
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 1 Dec 2021

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 508, Issue 2, December 2021, Pages 2758–2770, Copyright 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.


  • galaxies: star formation
  • ISM: atoms
  • radio lines: galaxies


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