FEASTS and MHONGOOSE: H I column density distribution at z = 0 for N HI > 10 17.8 ​​​​​​ cm −2

Wang, Jing, Lin, Xuchen, Liang, Ze-Zhong, de Blok, W. J. G. and van de Voort, Freeke ORCID: https://orcid.org/0000-0002-6301-638X 2026. FEASTS and MHONGOOSE: H I column density distribution at z = 0 for N HI > 10 17.8 ​​​​​​ cm −2. The Astrophysical Journal 1001 (1) , 123. 10.3847/1538-4357/ae5178

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Abstract

We present the first z = 0 H I column density distribution function, f(NHI), extending down to log(NHI/cm−2)=17.8 . This was derived from high-sensitivity 21 cm emission-line imaging at ∼1 kpc resolution. At high column densities (19.8 17.5 implies a covering fraction (fcov) of ∼0.7 within 1 kpc-scale H I-detected pixels at z = 0. Notably, for 17.817.8 gas within the virial radius around Milky Way–like galaxies. These findings provide new constraints on the baryonic flows and gaseous dynamics governing galaxy evolution.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Additional Information:	Full list of authors available at website: https://doi.org/10.3847/1538-4357/ae5178 License information from Publisher: LICENSE 1: URL: https://creativecommons.org/licenses/by/4.0/, Type: cc-by
Publisher:	American Astronomical Society
ISSN:	0004-637X
Date of First Compliant Deposit:	17 April 2026
Date of Acceptance:	27 February 2026
Last Modified:	17 Apr 2026 08:45
URI:	https://orca.cardiff.ac.uk/id/eprint/186451

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