Sinigaglia, FrancescoElson, EdVaccari, Mattia2025-01-212025-01-212024Sinigaglia, F., Rodighiero, G., Elson, E., Bianchetti, A., Vaccari, M., Maddox, N., Ponomareva, A.A., Frank, B.S., Jarvis, M.J., Catinella, B. and Cortese, L., 2024. MIGHTEE-H i: H i galaxy properties in the large-scale structure environment at z∼ 0.37 from a stacking experiment. Monthly Notices of the Royal Astronomical Society, 529(4), pp.4192-4209.https://doi.org/10.1093/mnras/stae713https://hdl.handle.net/10566/19888We 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.enemission linescosmology: large-scale structure of Universeevolutiongalaxies: formationMeerkatArticle