{"paper":{"title":"What drives the Balmer extinction sequence in spiral galaxies? Clues from the Sloan Digital Sky Survey","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Mateus Jr., G. Stasinska, L. Sodre Jr., R. Szczerba","submitted_at":"2004-03-22T19:51:56Z","abstract_excerpt":"Using spectra of normal emission line galaxies from the First Data Release of the Sloan Digital Sky Survey (SDSS) we have investigated the relations between the extinction $C({\\rm H}\\beta)$ as derived from the \\Ha/\\Hb emission line ratio and various global parameters of the galaxies. Our main findings are that: 1) $C({\\rm H}\\beta)$ is linked with the galaxy spectral type and colour, decreasing from early- to late-type spirals. 2) $C({\\rm H}\\beta)$ increases with increasing metallicity. 3) $C({\\rm H}\\beta)$ is larger in galaxies with an older stellar population. 4) $C({\\rm H}\\beta)$ is larger f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0403531","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/astro-ph/0403531/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"}