{"paper":{"title":"Towards a new classification of galaxies: principal component analysis of CALIFA circular velocity curves","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Adriana de Lorenzo-C\\'aceres, Cristina Catal\\'an-Torrecilla, Dario Colombo, Erik Rosolowsky, Estrella Florido, Jairo M\\'endez-Abreu, Joss Bland-Hawthorn, Keiichi Kodaira, Laura S\\'anchez-Menguiano, Llu\\'is Galbany, Luca Costantin, Raffaella A. Marino, Rahul Kannan, Ronald L\\\"asker, Rosa Gonz\\'alez Delgado, Rub\\'en Garc\\'ia-Benito, Sebastian F. S\\'anchez, Tom\\'as Ruiz-Lara, Veselina Kalinova","submitted_at":"2015-09-10T22:21:00Z","abstract_excerpt":"We present a galaxy classification system for 238 (E1-Sdm) CALIFA (Calar Alto Legacy Integral Field Area) galaxies based on the shapes and amplitudes of their circular velocity curves (CVCs). We infer the CVCs from the de-projected surface brightness of the galaxies, after scaling by a constant mass-to-light ratio based on stellar dynamics - solving axisymmetric Jeans equations via fitting the second velocity moment $V_{\\mathrm{rms}}=\\sqrt{V^2+\\sigma^2}$ of the stellar kinematics. We use principal component analysis (PCA) applied to the CVC shapes to find characteristic features and use a $k$-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.03352","kind":"arxiv","version":4},"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"}