1. MIGHTEE-H i: H i galaxy properties in the large-scale structure environment at z ∼ 0.37 from a stacking experiment.
- Author
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Sinigaglia, Francesco, Rodighiero, Giulia, Elson, Ed, Bianchetti, Alessandro, Vaccari, Mattia, Maddox, Natasha, Ponomareva, Anastasia A, Frank, Bradley S, Jarvis, Matt J, Catinella, Barbara, Cortese, Luca, Roychowdhury, Sambit, Baes, Maarten, Collier, Jordan D, Ilbert, Olivier, Khostovan, Ali A, Kurapati, Sushma, Pan, Hengxing, Prandoni, Isabella, and Rajohnson, Sambatriniaina H A
- Subjects
RADIO telescopes ,GALAXIES ,SPECTRAL lines ,DARK matter ,LARGE scale structure (Astronomy) - 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 |$M_{\rm H \, {\small I}}=(8.12\pm 0.75)\times 10^9\, {\rm M}_\odot$| at ∼11.8σ. Next, we investigate the different subsamples finding a negligible difference in M
H 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. [ABSTRACT FROM AUTHOR]- Published
- 2024
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