Abstract
We present the first measurement of H I mass of star-forming galaxies in different large scale structure environments from a blind survey at z ∼ 0.37. In particular, we carry out a spectral line stacking analysis considering 2875 spectra of colour-selected star-forming galaxies undetected in H I at 0.23 < z < 0.49 in the COSMOS field, extracted from the MIGHTEE-H I Early Science data cubes, acquired with the MeerKAT radio telescope. We stack galaxies belonging to different subsamples depending on three different definitions of large-scale structure environment: local galaxy overdensity, position inside the host dark matter halo (central, satellite, or isolated), and cosmic web type (field, filament, or knot). We first stack the full star-forming galaxy sample and find a robust H I detection yielding an average galaxy H I mass of MH I = (8.12 ± 0.75) × 109 M⊙ at ∼11.8σ. Next, we investigate the different subsamples finding a negligible difference in MH I as a function of the galaxy overdensity. We report an H I excess compared to the full sample in satellite galaxies (MH I = (11.31 ± 1.22) × 109, at ∼10.2σ) and in filaments (MH I = (11.62 ± 0.90) × 109. Conversely, we report non-detections for the central and knot galaxies subsamples, which appear to be H I-deficient. We find the same qualitative results also when stacking in units of H I fraction (fH I). We conclude that the H I amount in star-forming galaxies at the studied redshifts correlates with the large-scale structure environment.
Original language | English |
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Pages (from-to) | 4192-4209 |
Number of pages | 18 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 529 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Apr 2024 |
Bibliographical note
Publisher Copyright:© 2024 Oxford University Press. All rights reserved.
Open Access - Access Right Statement
© 2024 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/)Notes
WIP in RDKeywords
- emission lines, cosmology: large-scale structure of Universe
- evolution
- galaxies: formation