{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:KXJ4PNANSRZKYMPYU4CH3BKH6Z","short_pith_number":"pith:KXJ4PNAN","schema_version":"1.0","canonical_sha256":"55d3c7b40d9472ac31f8a7047d8547f6554550ff72dee4b2484a919fb76a5204","source":{"kind":"arxiv","id":"2105.03298","version":1},"attestation_state":"computed","paper":{"title":"A hidden population of high-redshift double quasars unveiled by astrometry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.GA","authors_text":"Hsiang-Chih Hwang, Jennifer I-Hsiu Li, Joseph Lazio, Masamune Oguri, Nadia Zakamska, Peter Breiding, Xin Liu, Yu-Ching Chen, Yue Shen","submitted_at":"2021-05-07T14:50:26Z","abstract_excerpt":"Galaxy mergers occur frequently in the early universe and bring multiple supermassive black holes (SMBHs) into the nucleus, where they may eventually coalesce. Identifying post-merger-scale (i.e., <~a few kpc) dual SMBHs is a critical pathway to understanding their dynamical evolution and successive mergers. While serendipitously discovering kpc-scale dual SMBHs at z<1 is possible, such systems are elusive at z>2, but critical to constraining the progenitors of SMBH mergers. The redshift z~2 also marks the epoch of peak activity of luminous quasars, hence probing this spatial regime at high re"},"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":"2105.03298","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-05-07T14:50:26Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"07aa4666d745d7dc9d6bbcb8922d4caed31db5fa9db5eeafd81353e2588572fe","abstract_canon_sha256":"278e1eb210d494079156885fe17d2e246df2383f8f056fbda45da06c40e7c2cf"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:05:33.623073Z","signature_b64":"JIypXzfthB60y92z5Rs+laVKs5Q/iJNWzZonvoKdpRinb+z6cHhLwbi22lyyeEnD50if0dh0/7bOvg5WBr3VBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"55d3c7b40d9472ac31f8a7047d8547f6554550ff72dee4b2484a919fb76a5204","last_reissued_at":"2026-07-05T03:05:33.622573Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:05:33.622573Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A hidden population of high-redshift double quasars unveiled by astrometry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.GA","authors_text":"Hsiang-Chih Hwang, Jennifer I-Hsiu Li, Joseph Lazio, Masamune Oguri, Nadia Zakamska, Peter Breiding, Xin Liu, Yu-Ching Chen, Yue Shen","submitted_at":"2021-05-07T14:50:26Z","abstract_excerpt":"Galaxy mergers occur frequently in the early universe and bring multiple supermassive black holes (SMBHs) into the nucleus, where they may eventually coalesce. Identifying post-merger-scale (i.e., <~a few kpc) dual SMBHs is a critical pathway to understanding their dynamical evolution and successive mergers. While serendipitously discovering kpc-scale dual SMBHs at z<1 is possible, such systems are elusive at z>2, but critical to constraining the progenitors of SMBH mergers. The redshift z~2 also marks the epoch of peak activity of luminous quasars, hence probing this spatial regime at high re"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.03298","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/2105.03298/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":"2105.03298","created_at":"2026-07-05T03:05:33.622628+00:00"},{"alias_kind":"arxiv_version","alias_value":"2105.03298v1","created_at":"2026-07-05T03:05:33.622628+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.03298","created_at":"2026-07-05T03:05:33.622628+00:00"},{"alias_kind":"pith_short_12","alias_value":"KXJ4PNANSRZK","created_at":"2026-07-05T03:05:33.622628+00:00"},{"alias_kind":"pith_short_16","alias_value":"KXJ4PNANSRZKYMPY","created_at":"2026-07-05T03:05:33.622628+00:00"},{"alias_kind":"pith_short_8","alias_value":"KXJ4PNAN","created_at":"2026-07-05T03:05:33.622628+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/KXJ4PNANSRZKYMPYU4CH3BKH6Z","json":"https://pith.science/pith/KXJ4PNANSRZKYMPYU4CH3BKH6Z.json","graph_json":"https://pith.science/api/pith-number/KXJ4PNANSRZKYMPYU4CH3BKH6Z/graph.json","events_json":"https://pith.science/api/pith-number/KXJ4PNANSRZKYMPYU4CH3BKH6Z/events.json","paper":"https://pith.science/paper/KXJ4PNAN"},"agent_actions":{"view_html":"https://pith.science/pith/KXJ4PNANSRZKYMPYU4CH3BKH6Z","download_json":"https://pith.science/pith/KXJ4PNANSRZKYMPYU4CH3BKH6Z.json","view_paper":"https://pith.science/paper/KXJ4PNAN","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2105.03298&json=true","fetch_graph":"https://pith.science/api/pith-number/KXJ4PNANSRZKYMPYU4CH3BKH6Z/graph.json","fetch_events":"https://pith.science/api/pith-number/KXJ4PNANSRZKYMPYU4CH3BKH6Z/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/KXJ4PNANSRZKYMPYU4CH3BKH6Z/action/timestamp_anchor","attest_storage":"https://pith.science/pith/KXJ4PNANSRZKYMPYU4CH3BKH6Z/action/storage_attestation","attest_author":"https://pith.science/pith/KXJ4PNANSRZKYMPYU4CH3BKH6Z/action/author_attestation","sign_citation":"https://pith.science/pith/KXJ4PNANSRZKYMPYU4CH3BKH6Z/action/citation_signature","submit_replication":"https://pith.science/pith/KXJ4PNANSRZKYMPYU4CH3BKH6Z/action/replication_record"}},"created_at":"2026-07-05T03:05:33.622628+00:00","updated_at":"2026-07-05T03:05:33.622628+00:00"}