{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:PIXRTVL6WCPGL6U7JU4LWIW7LY","short_pith_number":"pith:PIXRTVL6","schema_version":"1.0","canonical_sha256":"7a2f19d57eb09e65fa9f4d38bb22df5e3052ac631d55dca62220222e359aba17","source":{"kind":"arxiv","id":"1810.03776","version":2},"attestation_state":"computed","paper":{"title":"An intrinsic link between long-term UV/optical variations and X-ray loudness in quasars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"Fei-Fan Zhu (USTC), Feng Yuan (SHAO), Heng-Xiao Guo (UIUC), Jun-Xian Wang (USTC), Wei-Min Gu (XMU), Wen-yong Kang (USTC), Xin-Wu Cao (SHAO), Zhen-Yi Cai (USTC)","submitted_at":"2018-10-09T02:21:56Z","abstract_excerpt":"Observations have shown that UV/optical variation amplitude of quasars depend on several physi- cal parameters including luminosity, Eddington ratio, and likely also black hole mass. Identifying new factors which correlate with the variation is essential to probe the underlying physical processes. Combining ~ten years long quasar light curves from SDSS stripe 82 and X-ray data from Stripe 82X, we build a sample of X-ray detected quasars to investigate the relation between UV/optical variation amplitude ($\\sigma_{rms}$) and X-ray loudness. We find that quasars with more intense X-ray radiation "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1810.03776","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-09T02:21:56Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"e1c97ebcf3a428b9f55c5d1f461d5a7080066f54516ea125692b809a0f6c368b","abstract_canon_sha256":"bc0d1a98255b2ec64dc87f89ab57642c25f869139ca3dbdc3d0451a068c21f67"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:59:49.231294Z","signature_b64":"Gfst0uUp3bjKBjeWJARkzoQ8X38M316wDfbtJ1XYFx423vPDEerLSJdmam220wzm97wZSDxzpWubbbSCyi5sDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7a2f19d57eb09e65fa9f4d38bb22df5e3052ac631d55dca62220222e359aba17","last_reissued_at":"2026-05-17T23:59:49.230874Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:59:49.230874Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"An intrinsic link between long-term UV/optical variations and X-ray loudness in quasars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"Fei-Fan Zhu (USTC), Feng Yuan (SHAO), Heng-Xiao Guo (UIUC), Jun-Xian Wang (USTC), Wei-Min Gu (XMU), Wen-yong Kang (USTC), Xin-Wu Cao (SHAO), Zhen-Yi Cai (USTC)","submitted_at":"2018-10-09T02:21:56Z","abstract_excerpt":"Observations have shown that UV/optical variation amplitude of quasars depend on several physi- cal parameters including luminosity, Eddington ratio, and likely also black hole mass. Identifying new factors which correlate with the variation is essential to probe the underlying physical processes. Combining ~ten years long quasar light curves from SDSS stripe 82 and X-ray data from Stripe 82X, we build a sample of X-ray detected quasars to investigate the relation between UV/optical variation amplitude ($\\sigma_{rms}$) and X-ray loudness. We find that quasars with more intense X-ray radiation "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.03776","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1810.03776","created_at":"2026-05-17T23:59:49.230936+00:00"},{"alias_kind":"arxiv_version","alias_value":"1810.03776v2","created_at":"2026-05-17T23:59:49.230936+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.03776","created_at":"2026-05-17T23:59:49.230936+00:00"},{"alias_kind":"pith_short_12","alias_value":"PIXRTVL6WCPG","created_at":"2026-05-18T12:32:43.782077+00:00"},{"alias_kind":"pith_short_16","alias_value":"PIXRTVL6WCPGL6U7","created_at":"2026-05-18T12:32:43.782077+00:00"},{"alias_kind":"pith_short_8","alias_value":"PIXRTVL6","created_at":"2026-05-18T12:32:43.782077+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/PIXRTVL6WCPGL6U7JU4LWIW7LY","json":"https://pith.science/pith/PIXRTVL6WCPGL6U7JU4LWIW7LY.json","graph_json":"https://pith.science/api/pith-number/PIXRTVL6WCPGL6U7JU4LWIW7LY/graph.json","events_json":"https://pith.science/api/pith-number/PIXRTVL6WCPGL6U7JU4LWIW7LY/events.json","paper":"https://pith.science/paper/PIXRTVL6"},"agent_actions":{"view_html":"https://pith.science/pith/PIXRTVL6WCPGL6U7JU4LWIW7LY","download_json":"https://pith.science/pith/PIXRTVL6WCPGL6U7JU4LWIW7LY.json","view_paper":"https://pith.science/paper/PIXRTVL6","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1810.03776&json=true","fetch_graph":"https://pith.science/api/pith-number/PIXRTVL6WCPGL6U7JU4LWIW7LY/graph.json","fetch_events":"https://pith.science/api/pith-number/PIXRTVL6WCPGL6U7JU4LWIW7LY/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PIXRTVL6WCPGL6U7JU4LWIW7LY/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PIXRTVL6WCPGL6U7JU4LWIW7LY/action/storage_attestation","attest_author":"https://pith.science/pith/PIXRTVL6WCPGL6U7JU4LWIW7LY/action/author_attestation","sign_citation":"https://pith.science/pith/PIXRTVL6WCPGL6U7JU4LWIW7LY/action/citation_signature","submit_replication":"https://pith.science/pith/PIXRTVL6WCPGL6U7JU4LWIW7LY/action/replication_record"}},"created_at":"2026-05-17T23:59:49.230936+00:00","updated_at":"2026-05-17T23:59:49.230936+00:00"}