{"paper":{"title":"FEASTS and MHONGOOSE: HI Column Density Distribution at $z=0$ for $N_\\mathrm{HI}>10^{17.8}\\, \\mathrm{cm}^{-2}$","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"C\\'eline P\\'eroux, Claudia del P. Lagos, Di Li, D. Kleiner, Dong Yang, Fabian Walter, Fangxiong Zhong, F. M. Maccagni, Freeke van de Voort, George Heald, Hong Guo, J. Healy, Jing Wang, Kentaro Nagamine, Lister Staveley-Smith, Luis C. Ho, Peter Kamphuis, Qifeng Huang, Simon Weng, Siqi Liu, Siwei Zou, W.J.G. de Blok, Xinkai Chen, Xuchen Lin, Ze-zhong Liang, Zherong Su, Zhijie Qu","submitted_at":"2026-03-03T06:57:18Z","abstract_excerpt":"We present the first $z=0$ HI column density distribution function, $f(N_\\mathrm{HI})$, extending down to $\\log (N_\\mathrm{HI}/\\mathrm{cm}^{-2})=17.8$. This was derived from high-sensitivity 21-cm emission-line imaging at $\\sim$1 kpc resolution. At high-column-densities (19.8$< \\log (N_\\mathrm{HI}/\\mathrm{cm}^{-2}) <$21.3), our results align with earlier $z=0$ studies but benefit from 100 times greater sensitivity. Comparisons with $z\\sim3$ quasar absorption-line studies reveal that $f(N_\\mathrm{HI})$ at $z=0$ is systematically lower by 0.1-0.4 dex for $19.2< \\log (N_\\mathrm{HI}/\\mathrm{cm}^{-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2603.02670","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2603.02670/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}