{"paper":{"title":"E and S0 galaxies in the central part of the Coma cluster: Ages, metal abundances and dark matter","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Inger Jorgensen (Gemini Observatory)","submitted_at":"1999-02-18T02:13:48Z","abstract_excerpt":"Mean ages and metal abundances are estimated for the stellar populations in a sample of 115 E and S0 galaxies in the central 64'x70' of the Coma cluster. The estimates are based on the line indices Mg2, <Fe> and Hbeta, and the mass-to-light ratios (M/L). Stellar population models from Vazdekis et al. were used to transform from the measured parameters to mean ages, [Mg/H] and [Fe/H]. Comparison of the ages derived from the Mg2-Hbeta diagram to those derived from the Mg2-M/L diagram gives an estimate of the variation in the fraction of dark matter. The distributions of the derived mean ages and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9902250","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":""},"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"}