{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:DHVCRDGH2KW47GK66XMTJFCRZC","short_pith_number":"pith:DHVCRDGH","schema_version":"1.0","canonical_sha256":"19ea288cc7d2adcf995ef5d9349451c8acc6daad1b07220845c676335e23b125","source":{"kind":"arxiv","id":"1809.04610","version":2},"attestation_state":"computed","paper":{"title":"Constraining Sub-Parsec Binary Supermassive Black Holes in Quasars with Multi-Epoch Spectroscopy. III. Candidates from Continued Radial Velocity Tests","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"Abraham Loeb (Harvard), Hengxiao Guo (Illinois), J. X. Prochaska (UCSC), TalaWanda Monroe (STScI), Xin Liu (Illinois), Yue Shen (Illinois)","submitted_at":"2018-09-12T18:00:17Z","abstract_excerpt":"Quasars whose broad emission lines show temporal, bulk radial velocity (RV) shifts have been proposed as candidate sub-parsec (sub-pc), binary supermassive black holes (BSBHs). We identified a sample of 16 BSBH candidates based on two-epoch spectroscopy among 52 quasars with significant RV shifts over a few rest-frame years. The candidates showed consistent velocity shifts independently measured from two broad lines (H$\\beta$ and H$\\alpha$ or Mg${\\rm \\,II}$) without significant changes in the broad-line profiles. Here in the third paper of the series, we present further third- and fourth-epoch"},"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":"1809.04610","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-09-12T18:00:17Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"dcca7fe79cc08276999dbeee2a322a53784f58fd107b5076511225606d43e18b","abstract_canon_sha256":"5af5686550677f2f7f9a00c6e36df5e407d046b5ebd548e4a7e3a25b3cf79256"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:04:55.573958Z","signature_b64":"h1gXNv22LMSU3ejUDXH8ZJQH6HhPxMrQ0NO9D/VloY0VTJVE/PTuEs19qYBKbnZ/gPE/vvAGOtsa6W85gGJgBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"19ea288cc7d2adcf995ef5d9349451c8acc6daad1b07220845c676335e23b125","last_reissued_at":"2026-07-05T00:04:55.573424Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:04:55.573424Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Constraining Sub-Parsec Binary Supermassive Black Holes in Quasars with Multi-Epoch Spectroscopy. III. Candidates from Continued Radial Velocity Tests","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"Abraham Loeb (Harvard), Hengxiao Guo (Illinois), J. X. Prochaska (UCSC), TalaWanda Monroe (STScI), Xin Liu (Illinois), Yue Shen (Illinois)","submitted_at":"2018-09-12T18:00:17Z","abstract_excerpt":"Quasars whose broad emission lines show temporal, bulk radial velocity (RV) shifts have been proposed as candidate sub-parsec (sub-pc), binary supermassive black holes (BSBHs). We identified a sample of 16 BSBH candidates based on two-epoch spectroscopy among 52 quasars with significant RV shifts over a few rest-frame years. The candidates showed consistent velocity shifts independently measured from two broad lines (H$\\beta$ and H$\\alpha$ or Mg${\\rm \\,II}$) without significant changes in the broad-line profiles. Here in the third paper of the series, we present further third- and fourth-epoch"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.04610","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1809.04610/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1809.04610","created_at":"2026-07-05T00:04:55.573482+00:00"},{"alias_kind":"arxiv_version","alias_value":"1809.04610v2","created_at":"2026-07-05T00:04:55.573482+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.04610","created_at":"2026-07-05T00:04:55.573482+00:00"},{"alias_kind":"pith_short_12","alias_value":"DHVCRDGH2KW4","created_at":"2026-07-05T00:04:55.573482+00:00"},{"alias_kind":"pith_short_16","alias_value":"DHVCRDGH2KW47GK6","created_at":"2026-07-05T00:04:55.573482+00:00"},{"alias_kind":"pith_short_8","alias_value":"DHVCRDGH","created_at":"2026-07-05T00:04:55.573482+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/DHVCRDGH2KW47GK66XMTJFCRZC","json":"https://pith.science/pith/DHVCRDGH2KW47GK66XMTJFCRZC.json","graph_json":"https://pith.science/api/pith-number/DHVCRDGH2KW47GK66XMTJFCRZC/graph.json","events_json":"https://pith.science/api/pith-number/DHVCRDGH2KW47GK66XMTJFCRZC/events.json","paper":"https://pith.science/paper/DHVCRDGH"},"agent_actions":{"view_html":"https://pith.science/pith/DHVCRDGH2KW47GK66XMTJFCRZC","download_json":"https://pith.science/pith/DHVCRDGH2KW47GK66XMTJFCRZC.json","view_paper":"https://pith.science/paper/DHVCRDGH","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1809.04610&json=true","fetch_graph":"https://pith.science/api/pith-number/DHVCRDGH2KW47GK66XMTJFCRZC/graph.json","fetch_events":"https://pith.science/api/pith-number/DHVCRDGH2KW47GK66XMTJFCRZC/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/DHVCRDGH2KW47GK66XMTJFCRZC/action/timestamp_anchor","attest_storage":"https://pith.science/pith/DHVCRDGH2KW47GK66XMTJFCRZC/action/storage_attestation","attest_author":"https://pith.science/pith/DHVCRDGH2KW47GK66XMTJFCRZC/action/author_attestation","sign_citation":"https://pith.science/pith/DHVCRDGH2KW47GK66XMTJFCRZC/action/citation_signature","submit_replication":"https://pith.science/pith/DHVCRDGH2KW47GK66XMTJFCRZC/action/replication_record"}},"created_at":"2026-07-05T00:04:55.573482+00:00","updated_at":"2026-07-05T00:04:55.573482+00:00"}