Measuring cosmic density of neutral hydrogen via stacking the DINGO-VLA data
Abstract
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.
Citation
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
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Description
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.Collections
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