MIGHTEE-H I: the direct detection of neutral hydrogen in galaxies at z > 0.25

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dc.contributor.authorJarvis, Matt
dc.contributor.authorSantos, Mario
dc.contributor.authorSharma, Gauri
dc.date.accessioned2026-01-20T09:47:24Z
dc.date.available2026-01-20T09:47:24Z
dc.date.issued2025
dc.description.abstractAtomic hydrogen constitutes the gas reservoir from which molecular gas and star formation in galaxies emerges. However, the weakness ofthe line meansit has been difficult to directly detect in all but the very local Universe. Here, we presentresultsfrom the first search using the MeerKAT International Tiered Extragalactic Exploration (MIGHTEE) Survey for high-redshift (z > 0.25) H I emission from individual galaxies. By searching for 21-cm emission centred on the position and redshift of optically selected emission-line galaxies we overcome difficulties that hinder untargeted searches. We detect 11 galaxies at z > 0.25, forming the first sample of z > 0.25 detections with an interferometer, with the highest redshift detection at z = 0.3841. We find they have much larger H I masses than their low-redshift H I-selected counterparts for a given stellar mass. This can be explained by the much larger cosmological volume probed at these high redshifts, and does not require any evolution of the H I mass function. We make the first-ever measurement of the baryonic Tully–Fisher relation (bTFr) with H I at z > 0.25 and find consistency with the local bTFr, but with tentative evidence of a flattening in the relation at these redshifts for higher-mass objects. This may signify evolution, in line with predictions from hydrodynamic simulations, or that the molecular gas mass in these high-mass galaxies could be significant. This study paves the way for future studies of H I beyond the local Universe, using both searches targeted at known objects and via pure H I selection.
dc.identifier.citationJarvis, M.J., Tudorache, M.N., Heywood, I., Ponomareva, A.A., Baes, M., Maddox, N., Spekkens, K., Varasteanu, A., Hale, C.L., Santos, M.G. and Varadaraj, R.G., 2025. MIGHTEE-HI: The direct detection of neutral hydrogen in galaxies at $ z> 0.25$. arXiv preprint arXiv:2506.11935.
dc.identifier.urihttps://doi.org/10.1093/mnras/staf1702
dc.identifier.urihttps://hdl.handle.net/10566/21764
dc.language.isoen
dc.publisherOxford University Press
dc.subjectgalaxies: evolution
dc.subjectgalaxies: kinematics and dynamics
dc.subjectradio lines: galaxies
dc.subjectneutral hydrogen
dc.subjectgalaxies
dc.titleMIGHTEE-H I: the direct detection of neutral hydrogen in galaxies at z > 0.25
dc.typeArticle

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