MIGHTEE-H i : Environmental effects of cosmic filaments on extragalactic H i detections in the COSMOS and XMM-LSS fields

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ID: 332077
2026
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Abstract
Abstract Cosmic filaments have been recognised as influencing galaxy evolution, but their connection to galactic cold gas reservoirs is elusive, particularly at low redshifts. We investigate the influence of filaments on neutral hydrogen (H i) detections in galaxies at 0.02 < z < 0.09, using the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey in the COSMOS and XMM-LSS fields. We measure the fraction of optical galaxies from the Dark Energy Spectroscopic Instrument (DESI) Survey detected in H i emission as a function of stellar mass, morphology, local density, and the distance to the nearest filament. We find that galaxies closer to filaments have higher stellar masses, higher local densities, and a larger early-type fraction, all of which affect the H i detection. After controlling for these dependencies, filaments have measurable effects on H i detection. Late-type galaxies in low-local density environments show reduced H i detection fractions close to filaments across all stellar mass ranges, suggesting potential gas depletion through ram pressure stripping and cosmic web detachment. Massive early-type galaxies show an enhanced H i detection fraction in filaments compared to the voids, suggesting possible gas replenishment through filamentary accretion or gas-rich mergers. Our results suggest that cosmic filaments influence galactic H i gas reservoirs through various competing processes, whose relative importance varies with stellar mass and local density.
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Authors S Lyla Jung, Madalina N. Tudorache, M. J. Jarvis, Michalina Maksymowicz-Maciata, M. Baes, Marcin Glowacki, Natasha Maddox, Anastasia A Ponomareva, Kristine Spekkens, Tariq Yasin, B. H. Yue
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1916
URL
https://doi.org/10.1093/mnras/stag1916
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