{"paper":{"title":"The Sloan Lens ACS Survey. VI: Discovery and analysis of a double Einstein ring","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Adam S. Bolton (IfA, CfA), Leonidas A. Moustakas (JPL), Leon V.E. Koopmans (Kapteyn Astronomical Institute), Philip J. Marshall (UCSB), Raphael Gavazzi (UCSB), Scott Burles (MIT), Tommaso Treu (UCSB)","submitted_at":"2008-01-10T08:06:16Z","abstract_excerpt":"We report the discovery of two concentric Einstein rings around the gravitational lens SDSSJ0946+1006, as part of the Sloan Lens ACS Survey. The main lens is at redshift zl=0.222, while the inner ring (1) is at zs1=0.609 and Einstein radius $Re_1=1.43\\pm0.01\"$. The wider image separation ($Re_2=2.07\\pm 0.02\"$) of the outer ring (2) implies that it is at higher redshift. Its detection in the F814W filter implies zs2<6.9. The configuration can be well described by a total density profile $\\rho_{tot} ~ r^-g'$ with $g'=2.00\\pm0.03$ and velocity dispersion $\\sigma_{SIE}=287\\pm5\\kms$. [...] We consi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0801.1555","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/0801.1555/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"}