{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:AKFTKDHPS4WCQFAM4XL6M7QL4N","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":"6170b1a8182217737d290ae8b5b98db99bab0bca5b28c912bc0237e40e856551","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-02-21T18:44:39Z","title_canon_sha256":"f717a917d599fdb1621fb080952b4da13a2a8ba535b97281985055084ad77e2f"},"schema_version":"1.0","source":{"id":"1202.4725","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.4725","created_at":"2026-05-18T01:58:22Z"},{"alias_kind":"arxiv_version","alias_value":"1202.4725v1","created_at":"2026-05-18T01:58:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.4725","created_at":"2026-05-18T01:58:22Z"},{"alias_kind":"pith_short_12","alias_value":"AKFTKDHPS4WC","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"AKFTKDHPS4WCQFAM","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"AKFTKDHP","created_at":"2026-05-18T12:26:58Z"}],"graph_snapshots":[{"event_id":"sha256:7654d5484d059964dee7fae72cc29e57be94f968a41f53be4204688dc079e55b","target":"graph","created_at":"2026-05-18T01:58:22Z","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":"Accretion onto supermassive black holes (SMBHs) in galaxy formation simulations is frequently modelled by the Bondi-Hoyle formalism. Here we examine the validity of this approach analytically and numerically. We argue that the character of the flow where one evaluates the gas properties is unlikely to satisfy the simple Bondi-Hoyle model. Only in the specific case of hot virialised gas with zero angular momentum and negligible radiative cooling is the Bondi-Hoyle solution relevant. In the opposite extreme, where the gas is in a state of free-fall at the evaluation radius due to efficient cooli","authors_text":"Alexander Hobbs, Andrew King, Chris Power, Sergei Nayakshin","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-02-21T18:44:39Z","title":"Modelling supermassive black hole growth: towards an improved sub-grid prescription"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.4725","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":"sha256:3e920b53e484fb6f4a3c688112fad29f39258281e44e2c84c44acb6a64ca94bb","target":"record","created_at":"2026-05-18T01:58:22Z","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":"6170b1a8182217737d290ae8b5b98db99bab0bca5b28c912bc0237e40e856551","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-02-21T18:44:39Z","title_canon_sha256":"f717a917d599fdb1621fb080952b4da13a2a8ba535b97281985055084ad77e2f"},"schema_version":"1.0","source":{"id":"1202.4725","kind":"arxiv","version":1}},"canonical_sha256":"028b350cef972c28140ce5d7e67e0be37fdf6f947c2072815b40833210487041","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"028b350cef972c28140ce5d7e67e0be37fdf6f947c2072815b40833210487041","first_computed_at":"2026-05-18T01:58:22.742292Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:22.742292Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Q1cM0uPvniFPU3EmLapw7mNRs204h3XSqqy/kZa5X97ZMaFFG/Cu+XuOzlH0cmmh+3OFkwu3byJ0ZF/zBOgOBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:22.742782Z","signed_message":"canonical_sha256_bytes"},"source_id":"1202.4725","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3e920b53e484fb6f4a3c688112fad29f39258281e44e2c84c44acb6a64ca94bb","sha256:7654d5484d059964dee7fae72cc29e57be94f968a41f53be4204688dc079e55b"],"state_sha256":"ac7e4a5ed986b4436efbbe7633c451e47c3efed2557b74e3cf2193a63f64a286"}