{"paper":{"title":"The Microlensing Event Rate and Optical Depth Toward the Galactic Bulge from MOA-II","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"astro-ph.GA","authors_text":"A. Fukui, C.H. Ling, C.S. Botzler, D.J. Sullivan, D.P. Bennett, D. Suzuki, F. Abe, I.A. Bond, J. Tristram, K. Furusawa, K. Masuda, K. Ohnishi, K. Wada, N. Rattenbury, P., P.C.M. Yock, To. Saito, T. Sumi, W.L. Sweatman, Y. Itow, Y. Matsubara, Y. Muraki","submitted_at":"2013-05-01T14:43:31Z","abstract_excerpt":"We present measurements of the microlensing optical depth and event rate toward the Galactic Bulge based on two years of the MOA-II survey. This sample contains ~1000 microlensing events, with an Einstein Radius crossing time of t_E < 200 days between -5 <l< 10 degree and -7 <b< -1 degree. Our event rate and optical depth analysis uses 474 events with well defined microlensing parameters. In the central fields with |l|< 5 degree, we find an event rates of \\Gamma = [2.39+/-1.1]e^{[0.60\\pm0.05](3-|b|)}x 10^{-5}/star/yr and an optical depth of \\tau_{200} = [2.35+/-0.18]e^{[0.51+/-0.07](3-|b|)}x 1"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.0186","kind":"arxiv","version":3},"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"}