TY - JOUR
T1 - Measuring cosmic density of neutral hydrogen via stacking the DINGO-VLA data
AU - Chen, Q.
AU - Meyer, M.
AU - Popping, A.
AU - Staveley-Smith, L.
AU - Bryant, J.
AU - Delhaize, J.
AU - Holwerda, B.W.
AU - Cluver, M.E.
AU - Loveday, J.
AU - Lopez-Sanchez, A.R.
AU - Zwaan, M.
AU - Taylor, E.N.
AU - Hopkins, A.M.
AU - Wright, A.
AU - Driver, S.
AU - Brough, S.
PY - 2021
Y1 - 2021
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 MH I = (1.67 ± 0.18) à 109 Mʘ. The corresponding cosmic density of neutral atomic hydrogen is ΩH I = (0.38 ± 0.04) à 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 MH I = (1.67 ± 0.18) à 109 Mʘ. The corresponding cosmic density of neutral atomic hydrogen is ΩH I = (0.38 ± 0.04) à 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.
UR - https://hdl.handle.net/1959.7/uws:66721
U2 - 10.1093/mnras/stab2810
DO - 10.1093/mnras/stab2810
M3 - Article
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 -