{"paper":{"title":"Extreme Scattering Events: An Observational Summary","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Alan L. Fey (USNO), R. A. Gaume (USNO), T. Joseph W. Lazio (NRL)","submitted_at":"2000-07-07T18:17:14Z","abstract_excerpt":"We review observational constraints on the structures responsible for extreme scattering events, focussing on a series of observations of the quasar PKS 1741-038. VLA observations were conducted to search for changes in the rotation measure and H I absorption during the ESE, while VLBI observations sought ESE-induced changes in the source's image. No RM changes were found implying B_|| < 12 mG, and no H I opacity changes were found implying N(H I) < 6.4 x 10^{17} cm^{-2}. No multiple imaging was observed, but the diameter of the source increased by 0.7 mas, contrary to what is predicted by sim"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0007098","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/astro-ph/0007098/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"}