TY - JOUR
T1 - Measuring cosmic density of neutral hydrogen via stacking the DINGO-VLA data
AU - Chen, Qingxiang
AU - Meyer, Martin
AU - Popping, Attila
AU - Staveley-Smith, Lister
AU - Bryant, Julia
AU - Delhaize, Jacinta
AU - Holwerda, B. W.
AU - Cluver, M. E.
AU - Loveday, J.
AU - Lopez-Sanchez, Angel R.
AU - Zwaan, Martin
AU - Taylor, E. N.
AU - Hopkins, A. M.
AU - Wright, Angus
AU - Driver, Simon
AU - Brough, S.
N1 - Funding Information:
Parts of this research were supported by the Australian Research Council Centres of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) and All-Sky Astrophysics (CAASTRO), through project numbers CE170100013 and CE110001020, respectively. Chen acknowledgesDrBarbara Catinella,Dr Jonghwan Rhee, andDr Wenkai Hu for helpful discussions. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Publisher Copyright:
© 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - 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) × 109M⊙. 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.
AB - 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) × 109M⊙. 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.
KW - galaxies: star formation
KW - ISM: atoms
KW - radio lines: galaxies
UR - http://www.scopus.com/inward/record.url?scp=85119076161&partnerID=8YFLogxK
U2 - 10.1093/mnras/stab2810
DO - 10.1093/mnras/stab2810
M3 - Article
AN - SCOPUS:85119076161
SN - 0035-8711
VL - 508
SP - 2758
EP - 2770
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -