Measuring cosmic density of neutral hydrogen via stacking the DINGO-VLA data
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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 MHI=(1.67±0.18)×109 M⊙MHI=(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.
Chen , Q , Meyer , M , Popping , A , Staveley-Smith , L , Bryant , J , Delhaize , J , Holwerda , B W , Cluver , M E , Loveday , J , Lopez-Sanchez , A R , Zwaan , M , Taylor , E N , Hopkins , A M , Wright , A , Driver , S & Brough , S 2021 , ' Measuring cosmic density of neutral hydrogen via stacking the DINGO-VLA data ' , Monthly Notices of the Royal Astronomical Society , vol. 508 , no. 2 , pp. 2758-2770 . https://doi.org/10.1093/mnras/stab2810
Monthly Notices of the Royal Astronomical Society
Copyright © 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stab2810.
DescriptionParts 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.
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