{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:C4VG46VQRBCE3YKEJ2UK4MFWZM","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"21f4c94e8ed7c37440571a2632957ab5b5ac5efb63409fd2749895d6994e55ba","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-04-02T13:42:04Z","title_canon_sha256":"29d25c5d8c979d344623080f259bda9e780e2c9e7d90ca32531731343a201759"},"schema_version":"1.0","source":{"id":"0904.0385","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.0385","created_at":"2026-05-18T02:34:59Z"},{"alias_kind":"arxiv_version","alias_value":"0904.0385v1","created_at":"2026-05-18T02:34:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.0385","created_at":"2026-05-18T02:34:59Z"},{"alias_kind":"pith_short_12","alias_value":"C4VG46VQRBCE","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"C4VG46VQRBCE3YKE","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"C4VG46VQ","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:c0b51390c361c828b4f2e0f6486f25640698936ab04d0088e186386701158ab9","target":"graph","created_at":"2026-05-18T02:34:59Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We report on key studies on the dynamics of black holes (BHs) in gas-rich galaxy mergers that underscore the vital role played by gas dissipation in promoting BH inspiral down to the smallest scales ever probed with use of high-resolution numerical simulations. In major mergers, the BHs sink rapidly under the action of gas-dynamical friction while orbiting inside the massive nuclear disc resulting from the merger. The BHs then bind and form a Keplerian binary on a scale of 5 pc. In minor mergers, BH pairing proceeds down to the minimum scale explored of 10-100 pc only when the gas fraction in ","authors_text":"L. Mayer, M. Colpi, M. Dotti, S. Callegari","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-04-02T13:42:04Z","title":"Massive black hole binary evolution in gas-rich mergers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.0385","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:7f72cf4abbe323e76eb59225cc730b5361a787a2d7f73c16af58a29d40c83830","target":"record","created_at":"2026-05-18T02:34:59Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"21f4c94e8ed7c37440571a2632957ab5b5ac5efb63409fd2749895d6994e55ba","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-04-02T13:42:04Z","title_canon_sha256":"29d25c5d8c979d344623080f259bda9e780e2c9e7d90ca32531731343a201759"},"schema_version":"1.0","source":{"id":"0904.0385","kind":"arxiv","version":1}},"canonical_sha256":"172a6e7ab088444de1444ea8ae30b6cb12bde04e5af5ef049746c8f6c62f750c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"172a6e7ab088444de1444ea8ae30b6cb12bde04e5af5ef049746c8f6c62f750c","first_computed_at":"2026-05-18T02:34:59.978156Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:34:59.978156Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CYgyi1wAFqtgshYFLqccRwZ/Y567OaA11mLqKlpI9keiVPBMIY+cRAsysRZfPl/7J+5+n4b42nYFUOznS8ZsCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:34:59.978567Z","signed_message":"canonical_sha256_bytes"},"source_id":"0904.0385","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7f72cf4abbe323e76eb59225cc730b5361a787a2d7f73c16af58a29d40c83830","sha256:c0b51390c361c828b4f2e0f6486f25640698936ab04d0088e186386701158ab9"],"state_sha256":"55bdf5e8f2a27125eba79c77e540da3770e00c928ae21401e6324d46ea8dfea3"}