{"paper":{"title":"Long-term optical variability properties of the Palomar-Green quasars","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Dan Maoz, Hagai Netzer, Paul S. Smith, Shai Kaspi, Uriel Giveon","submitted_at":"1999-02-18T10:56:35Z","abstract_excerpt":"We present results from a monitoring program of 42 quasars from the Palomar Green sample. The objects were observed for 7 years at the Wise Observatory, as part of a long term effort to monitor AGN of various types. This is the most extensive program of its kind carried out to date on a well-defined optically selected quasar sample. The typical sampling interval is ~40 days. One third of the quasars were observed at ~60 epochs and the rest at ~30 epochs in two bands (B&R) with photometric accuracy of ~0.01 mag. We present lightcurves for all of the sources and discuss the sample variability pr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9902254","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"}