{"paper":{"title":"The Largest Gravitational Lens: MACS J0717.5+3745 (z=0.546)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Adi Zitrin, Sharon Sadeh, Tom Broadhurst, Yoel Rephaeli","submitted_at":"2009-07-24T08:17:10Z","abstract_excerpt":"We identify 13 sets of multiply-lensed galaxies around MACS J0717.5+3745 ($z=0.546$), outlining a very large tangential critical curve of major axis $\\sim2.8\\arcmin$, filling the field of HST/ACS. The equivalent circular Einstein radius is $\\theta_{e}= 55 \\pm 3\\arcsec$ (at an estimated source redshift of $z_{s}\\sim2.5$), corresponding to $r_e\\simeq 350\\pm 20 kpc$ at the cluster redshift, nearly three times greater than that of A1689 ($r_e\\simeq 140 kpc$ for $z_{s}=2.5$). The mass enclosed by this critical curve is very large, $7.4\\pm 0.5 \\times 10^{14}M_{\\odot}$ and only weakly model dependent"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.4232","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"}