{"paper":{"title":"Dark Matter Fraction in Lens Galaxies: New Estimates from Microlensing","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"2), 4), AstroParticle Physics, Campus de Fuentenueva (2) Instituto Carlos I de F\\'isica Te\\'orica y Computacional, C. S. Kochanek (5), E. Mediavilla (3, J. A. Mu\\~noz (6) ((1) Departamento de F\\'isica Te\\'orica y del Cosmos, J. Jim\\'enez-Vicente (1, La Laguna 38200, Spain (4) Departamento de Astrof\\'isica, Tenerife, the Center for Cosmology, The Ohio State University (6) Departamento de Astronom\\'ia y Astrof\\'isica, Universidad de Granada, Universidad de Granada (3) Instituto de Astrof\\'isica de Canarias, Universidad de la Laguna (5) Department of Astronomy, Universidad de Valencia), V\\'ia L\\'actea S/N","submitted_at":"2014-07-15T12:09:00Z","abstract_excerpt":"We present a joint estimate of the stellar/dark matter mass fraction in lens galaxies and the average size of the accretion disk of lensed quasars from microlensing measurements of 27 quasar image pairs seen through 19 lens galaxies. The Bayesian estimate for the fraction of the surface mass density in the form of stars is $\\alpha=0.21\\pm0.14$ near the Einstein radius of the lenses ($\\sim 1 - 2$ effective radii). The estimate for the average accretion disk size is $R_{1/2}=7.9^{+3.8}_{-2.6}\\sqrt{M/0.3M_\\sun}$ light days. The fraction of mass in stars at these radii is significantly larger than"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.3955","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"}