{"paper":{"title":"Microlensing induced spectral variability in Q2237+0305","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C.B. Foltz, G.F. Lewis, M.J. Irwin, P.C. Hewett","submitted_at":"1997-11-03T23:54:46Z","abstract_excerpt":"We present both photometry and spectra of the individual images of the quadruple gravitational lens system Q2237+0305. Comparison of spectra obtained at two epochs, separated by $\\sim~3\\,$years, shows evidence for significant changes in the emission line to continuum ratio of the strong ultraviolet CIV~$\\lambda$1549, CIII]~$\\lambda$1909 and MgII~$\\lambda$2798 lines. The short, $\\sim~1\\,$day, light--travel time differences between the sight lines to the four individual quasar images rule out any explanation based on intrinsic variability of the source. The spectroscopic differences thus represe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9711018","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":""},"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"}