{"paper":{"title":"The MACH HI absorption survey I: Physical conditions of cold atomic gas outside of the Galactic plane","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Carl Heiles, Claire E. Murray, John M. Dickey, M.-Y. Lee, Nicholas Killerby-Smith, N. M. McClure-Griffiths, Sne\\v{z}ana Stanimirovi\\'c, W. M. Goss","submitted_at":"2021-06-29T17:58:31Z","abstract_excerpt":"Tracing the transition between the diffuse atomic interstellar medium (ISM) and cold, dense gas is crucial for deciphering the star formation cycle in galaxies. Here we present MACH, a new survey of cold neutral hydrogen (HI) absorption at $21\\rm\\,cm$ by the Karl G. Jansky Very Large Array. We target 42 bright background sources with $60<l<110^{\\circ}$, $30<b<62^{\\circ}$, significantly expanding the sample of publicly-available, sensitive $21\\rm\\,cm$ absorption outside the Galactic plane. With matching $21\\rm\\,cm$ emission data from the EBHIS survey, we measure the total column density and col"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.15614","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/2106.15614/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"}