{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:C5MLL65WQZVFPEYTXOBCZM7MW6","short_pith_number":"pith:C5MLL65W","schema_version":"1.0","canonical_sha256":"1758b5fbb6866a579313bb822cb3ecb7b1c59c9a4baf0a0298abd1a023e1933a","source":{"kind":"arxiv","id":"1805.06921","version":2},"attestation_state":"computed","paper":{"title":"A new physical interpretation of optical and infrared variability in quasars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aaron M. Meisner, Andrew J. Drake, Arjun Dey, Barry McKernan, Daniel Stern, Dustin Lang, Hyunsung D. Jun, K. E. Saavik Ford, Matthew Graham, Nicholas P. Ross, Roberto J. Assef","submitted_at":"2018-05-17T18:34:20Z","abstract_excerpt":"Changing-look quasars are a recently identified class of active galaxies in which the strong UV continuum and/or broad optical hydrogen emission lines associated with unobscured quasars either appear or disappear on timescales of months to years. The physical processes responsible for this behaviour are still debated, but changes in the black hole accretion rate or accretion disk structure appear more likely than changes in obscuration. Here we report on four epochs of spectroscopy of SDSS J110057.70-005304.5, a quasar at a redshift of $z=0.378$ whose UV continuum and broad hydrogen emission l"},"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":"1805.06921","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-17T18:34:20Z","cross_cats_sorted":[],"title_canon_sha256":"deefa1c0cfaedd7c21da45f171a2032f9cd1110c3710215e7ff846f9d268fbda","abstract_canon_sha256":"e8eda9ec3933d6dbafbeaff84b46031a75d981e020ff7ed619ac5527c214bfd9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:04:39.361221Z","signature_b64":"91QD9C1YY0oHO4AHSbzs49YZwqC4JMJOuW5tijmECP5KRWAdECn4EMJttChcz6CYqxMf+OmqlPyTkCOyTASgDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1758b5fbb6866a579313bb822cb3ecb7b1c59c9a4baf0a0298abd1a023e1933a","last_reissued_at":"2026-05-18T00:04:39.360836Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:04:39.360836Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A new physical interpretation of optical and infrared variability in quasars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aaron M. Meisner, Andrew J. Drake, Arjun Dey, Barry McKernan, Daniel Stern, Dustin Lang, Hyunsung D. Jun, K. E. Saavik Ford, Matthew Graham, Nicholas P. Ross, Roberto J. Assef","submitted_at":"2018-05-17T18:34:20Z","abstract_excerpt":"Changing-look quasars are a recently identified class of active galaxies in which the strong UV continuum and/or broad optical hydrogen emission lines associated with unobscured quasars either appear or disappear on timescales of months to years. The physical processes responsible for this behaviour are still debated, but changes in the black hole accretion rate or accretion disk structure appear more likely than changes in obscuration. Here we report on four epochs of spectroscopy of SDSS J110057.70-005304.5, a quasar at a redshift of $z=0.378$ whose UV continuum and broad hydrogen emission l"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.06921","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":"1805.06921","created_at":"2026-05-18T00:04:39.360896+00:00"},{"alias_kind":"arxiv_version","alias_value":"1805.06921v2","created_at":"2026-05-18T00:04:39.360896+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.06921","created_at":"2026-05-18T00:04:39.360896+00:00"},{"alias_kind":"pith_short_12","alias_value":"C5MLL65WQZVF","created_at":"2026-05-18T12:32:16.446611+00:00"},{"alias_kind":"pith_short_16","alias_value":"C5MLL65WQZVFPEYT","created_at":"2026-05-18T12:32:16.446611+00:00"},{"alias_kind":"pith_short_8","alias_value":"C5MLL65W","created_at":"2026-05-18T12:32:16.446611+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/C5MLL65WQZVFPEYTXOBCZM7MW6","json":"https://pith.science/pith/C5MLL65WQZVFPEYTXOBCZM7MW6.json","graph_json":"https://pith.science/api/pith-number/C5MLL65WQZVFPEYTXOBCZM7MW6/graph.json","events_json":"https://pith.science/api/pith-number/C5MLL65WQZVFPEYTXOBCZM7MW6/events.json","paper":"https://pith.science/paper/C5MLL65W"},"agent_actions":{"view_html":"https://pith.science/pith/C5MLL65WQZVFPEYTXOBCZM7MW6","download_json":"https://pith.science/pith/C5MLL65WQZVFPEYTXOBCZM7MW6.json","view_paper":"https://pith.science/paper/C5MLL65W","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1805.06921&json=true","fetch_graph":"https://pith.science/api/pith-number/C5MLL65WQZVFPEYTXOBCZM7MW6/graph.json","fetch_events":"https://pith.science/api/pith-number/C5MLL65WQZVFPEYTXOBCZM7MW6/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/C5MLL65WQZVFPEYTXOBCZM7MW6/action/timestamp_anchor","attest_storage":"https://pith.science/pith/C5MLL65WQZVFPEYTXOBCZM7MW6/action/storage_attestation","attest_author":"https://pith.science/pith/C5MLL65WQZVFPEYTXOBCZM7MW6/action/author_attestation","sign_citation":"https://pith.science/pith/C5MLL65WQZVFPEYTXOBCZM7MW6/action/citation_signature","submit_replication":"https://pith.science/pith/C5MLL65WQZVFPEYTXOBCZM7MW6/action/replication_record"}},"created_at":"2026-05-18T00:04:39.360896+00:00","updated_at":"2026-05-18T00:04:39.360896+00:00"}