{"paper":{"title":"Vz-GAL Dusty Star-Forming Galaxies: Revisiting the CO-H2 Conversion Factor Tension","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Amelie Saintonge, Andrew J. Baker, Asantha Cooray, Axel Weiss, Bethany Jones, Chentao Yang, Diana Ismail, Dominik Riechers, Edoardo Borsato, Emilio Romano-Diaz, Hiddo S. B. Algera, Kirsty M. Butler, Leindert A. Boogaard, Matthew Lehnert, Paul van der Werf, Pierre Cox, Prachi Prajapati, Roberto Neri, Stefano Berta, Tom J. L. C. Bakx","submitted_at":"2026-07-20T18:49:40Z","abstract_excerpt":"The CO luminosity-to-H$_2$ mass conversion factor ($\\alpha_{CO}$) remains a debated uncertainty in determining molecular gas masses of high-redshift dusty star-forming galaxies (DSFGs). Dynamical mass constraints have often favored $\\alpha_{CO}=0.8$~$M_{\\odot}~{(K~km~{s}^{-1}~{pc}^{2})}^{-1}$, whereas dust- and radiative-transfer-based methods imply higher values. We revisit this ``tension\" using the largest homogeneous sample of 21 unlensed $z\\sim1-4$ DSFGs, with securely measured \\coonezero luminosities from the VLA \\vzgal survey and resolved ($\\sim{0.1}^{\\prime\\prime}$) ALMA 1~mm dust conti"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.18440","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/2607.18440/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"}