{"paper":{"title":"SDSS-IV MaNGA: The Impact of Diffuse Ionized Gas on Emission-line Ratios, Interpretation of Diagnostic Diagrams, and Gas Metallicity Measurements","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aleksandar M. Diamond-Stanic, Alexandre Roman Lopes, Amy Jones, Audrey Simmons, Brett Andrews, Cheng Li, Christian Nitschelm, Christy Tremonti, Daniel Oravetz, Daniel Thomas, David R. Law, Dmitry Bizyaev, Edmond Cheung, Francesco Belfiore, Joel R. Brownstein, Jon Brinkmann, Kaike Pan, Kai Zhang, Kevin Bundy, L. Matthew Haffner, Matthew Bershady, Niv Drory, Renbin Yan, Ren\\'e Walterbos, Roberto Maiolino, Sebastian F. S\\'anchez, Thaisa Storchi-Bergmann","submitted_at":"2016-12-06T21:00:01Z","abstract_excerpt":"Diffuse Ionized Gas (DIG) is prevalent in star-forming galaxies. Using a sample of 365 nearly face-on star-forming galaxies observed by MaNGA, we demonstrate how DIG in star-forming galaxies impacts the measurements of emission line ratios, hence the interpretation of diagnostic diagrams and gas-phase metallicity measurements. At fixed metallicity, DIG-dominated low H\\alpha\\ surface brightness regions display enhanced [SII]/H\\alpha, [NII]/H\\alpha, [OII]/H\\beta, and [OI]/H\\alpha. The gradients in these line ratios are determined by metallicity gradients and H\\alpha\\ surface brightness. In line "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.02000","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}