MIGHTEE-H i : environmental effects of cosmic filaments on extragalactic H i detections in the COSMOS and XMM-LSS fields
9 affiliations
- 1Astrophysics, Denys Wilkinson Building, Department of Physics, University of Oxford , Keble Road, Oxford OX1 3RH ,
- 2Institute of Astronomy, University of Cambridge , Madingley Road, Cambridge CB3 0HA ,
- 3Department of Physics and Astronomy, University of the Western Cape , Robert Sobukwe Road, 7535 Bellville, Cape Town ,
- 4School of Physics, H.H. Wills Physics Laboratory, Tyndall Avenue, University of Bristol , Bristol BS8 1TL ,
- 5Department of Physics and Astronomy, Universiteit Gent , Proeftuinstraat 86 N3, B-9000 Ghent ,
- 6Institute for Astronomy, University of Edinburgh , Royal Observatory, Edinburgh EH9 3HJ ,
- 7Inter-University Institute for Data Intensive Astronomy, Department of Astronomy, University of Cape Town , Cape Town7700 ,
- 8Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire , College Lane, Hatfield AL10 9AB ,
- 9Department of Physics, Engineering Physics and Astronomy, Queen’s University , Kingston, ON K7L 3N6 ,
Abstract
Cosmic filaments have been recognized 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 0.02lt zlt 0.09, using the MeerKAT International GHz Tiered Extragalactic Exploration survey in the COSMOS and XMM-LSS fields. We measure the fraction of optical galaxies from the Dark Energy Spectroscopic Instrument 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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BibTeX
@article{jung2026mighteeh,
title = {{MIGHTEE-H i : environmental effects of cosmic filaments on extragalactic H i detections in the COSMOS and XMM-LSS fields}},
author = {S Lyla Jung and Madalina N Tudorache and Matt J Jarvis and Michalina Maksymowicz-Maciata and Maarten Baes and Marcin Glowacki and Natasha Maddox and Anastasia A Ponomareva and Kristine Spekkens and Tariq Yasin and Bohan Yue},
journal = {Monthly Notices of the Royal Astronomical Society},
year = {2026},
month = oct,
doi = {10.1093/mnras/stag1916},
url = {https://academic.oup.com/mnras/article/doi/10.1093/mnras/stag1916/8907350},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - MIGHTEE-H i : environmental effects of cosmic filaments on extragalactic H i detections in the COSMOS and XMM-LSS fields
AU - S Lyla Jung
AU - Madalina N Tudorache
AU - Matt J Jarvis
AU - Michalina Maksymowicz-Maciata
AU - Maarten Baes
AU - Marcin Glowacki
AU - Natasha Maddox
AU - Anastasia A Ponomareva
AU - Kristine Spekkens
AU - Tariq Yasin
AU - Bohan Yue
PY - 2026
DA - 2026/10/10
JO - Monthly Notices of the Royal Astronomical Society
DO - 10.1093/mnras/stag1916
UR - https://academic.oup.com/mnras/article/doi/10.1093/mnras/stag1916/8907350
AB - Cosmic filaments have been recognized 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 0.02lt zlt 0.09, using the MeerKAT International GHz Tiered Extragalactic Exploration survey in the COSMOS and XMM-LSS fields. We measure the fraction of optical galaxies from the Dark Energy Spectroscopic Instrument 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.
SN - 0035-8711
SN - 1365-2966
ER -