{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:HHB4BVO7EM6PPC73PFA2JRJZ4Q","short_pith_number":"pith:HHB4BVO7","canonical_record":{"source":{"id":"2406.05778","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2024-06-09T13:21:29Z","cross_cats_sorted":[],"title_canon_sha256":"efacaab451c2210cdf6cc32b77621f3fd5b5212f81b6ccfa52cedf13583c78da","abstract_canon_sha256":"a3535b2293a35f5aed164bdf254aaf27c261e81e6ffcfe1b89e82a57b1bfd13f"},"schema_version":"1.0"},"canonical_sha256":"39c3c0d5df233cf78bfb7941a4c539e405b1dbecd849b840c059c011382a086d","source":{"kind":"arxiv","id":"2406.05778","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2406.05778","created_at":"2026-07-05T08:54:52Z"},{"alias_kind":"arxiv_version","alias_value":"2406.05778v2","created_at":"2026-07-05T08:54:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2406.05778","created_at":"2026-07-05T08:54:52Z"},{"alias_kind":"pith_short_12","alias_value":"HHB4BVO7EM6P","created_at":"2026-07-05T08:54:52Z"},{"alias_kind":"pith_short_16","alias_value":"HHB4BVO7EM6PPC73","created_at":"2026-07-05T08:54:52Z"},{"alias_kind":"pith_short_8","alias_value":"HHB4BVO7","created_at":"2026-07-05T08:54:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:HHB4BVO7EM6PPC73PFA2JRJZ4Q","target":"record","payload":{"canonical_record":{"source":{"id":"2406.05778","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2024-06-09T13:21:29Z","cross_cats_sorted":[],"title_canon_sha256":"efacaab451c2210cdf6cc32b77621f3fd5b5212f81b6ccfa52cedf13583c78da","abstract_canon_sha256":"a3535b2293a35f5aed164bdf254aaf27c261e81e6ffcfe1b89e82a57b1bfd13f"},"schema_version":"1.0"},"canonical_sha256":"39c3c0d5df233cf78bfb7941a4c539e405b1dbecd849b840c059c011382a086d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:54:52.074924Z","signature_b64":"gOG0yXCZyXRyzZdShaMG0+wzY373OGAvOeax96oPIXyJgq3ACTKnTkQn1NpjxsSqURzQjjuhmQVlPUchP43fCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"39c3c0d5df233cf78bfb7941a4c539e405b1dbecd849b840c059c011382a086d","last_reissued_at":"2026-07-05T08:54:52.074518Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:54:52.074518Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2406.05778","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T08:54:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0T0H/rPDbxthM9MiCFO1LDMXfEPGz/N27KkdCIdGP1txLL48f8Fn7GT1E2/duUgC6zsZeeFTcfvvwK4Qv5lVDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T10:58:42.822357Z"},"content_sha256":"db926c54d15d84e02c153eb21c384d83354d2c5f88e55f66e70ebd637f32989b","schema_version":"1.0","event_id":"sha256:db926c54d15d84e02c153eb21c384d83354d2c5f88e55f66e70ebd637f32989b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:HHB4BVO7EM6PPC73PFA2JRJZ4Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Identification of Intermediate-mass Black Hole Candidates Among a Sample of Sd Galaxies","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alister W. Graham, Benjamin L. Davis, Elena D'Onghia, Igor D. Karachentsev, Roberto Soria, Valentina E. Karachentseva, Zehao Jin","submitted_at":"2024-06-09T13:21:29Z","abstract_excerpt":"We analyzed images of every northern hemisphere Sd galaxy listed in the Third Reference Catalogue of Bright Galaxies (RC3) with a relatively face-on inclination ($\\theta\\leq30{\\deg}$). Specifically, we measured the spiral arms' winding angle, $\\phi$, in 85 galaxies. We applied a novel black hole mass planar scaling relation involving the rotational velocities (from the literature) and pitch angles of each galaxy to predict central black hole masses. This yielded 23 galaxies, each having at least a 50% chance of hosting a central intermediate-mass black hole (IMBH), $10^2<M_\\mathrm{BH}\\leq10^5\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2406.05778","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/2406.05778/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T08:54:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0oozOH4eh5g9R9lBglKiAnFue58alu/SBsKu/rBTYeFxeEcpvfvb3Cg5WZvAhtjg8D6N51E9PLUh7tRPdIEPDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T10:58:42.823285Z"},"content_sha256":"80b204723ea2d4d6bdd2378c1437efc3bd0b2c8fe5283119902d414068355b5e","schema_version":"1.0","event_id":"sha256:80b204723ea2d4d6bdd2378c1437efc3bd0b2c8fe5283119902d414068355b5e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HHB4BVO7EM6PPC73PFA2JRJZ4Q/bundle.json","state_url":"https://pith.science/pith/HHB4BVO7EM6PPC73PFA2JRJZ4Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HHB4BVO7EM6PPC73PFA2JRJZ4Q/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-13T10:58:42Z","links":{"resolver":"https://pith.science/pith/HHB4BVO7EM6PPC73PFA2JRJZ4Q","bundle":"https://pith.science/pith/HHB4BVO7EM6PPC73PFA2JRJZ4Q/bundle.json","state":"https://pith.science/pith/HHB4BVO7EM6PPC73PFA2JRJZ4Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HHB4BVO7EM6PPC73PFA2JRJZ4Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:HHB4BVO7EM6PPC73PFA2JRJZ4Q","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":"a3535b2293a35f5aed164bdf254aaf27c261e81e6ffcfe1b89e82a57b1bfd13f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2024-06-09T13:21:29Z","title_canon_sha256":"efacaab451c2210cdf6cc32b77621f3fd5b5212f81b6ccfa52cedf13583c78da"},"schema_version":"1.0","source":{"id":"2406.05778","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2406.05778","created_at":"2026-07-05T08:54:52Z"},{"alias_kind":"arxiv_version","alias_value":"2406.05778v2","created_at":"2026-07-05T08:54:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2406.05778","created_at":"2026-07-05T08:54:52Z"},{"alias_kind":"pith_short_12","alias_value":"HHB4BVO7EM6P","created_at":"2026-07-05T08:54:52Z"},{"alias_kind":"pith_short_16","alias_value":"HHB4BVO7EM6PPC73","created_at":"2026-07-05T08:54:52Z"},{"alias_kind":"pith_short_8","alias_value":"HHB4BVO7","created_at":"2026-07-05T08:54:52Z"}],"graph_snapshots":[{"event_id":"sha256:80b204723ea2d4d6bdd2378c1437efc3bd0b2c8fe5283119902d414068355b5e","target":"graph","created_at":"2026-07-05T08:54:52Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2406.05778/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We analyzed images of every northern hemisphere Sd galaxy listed in the Third Reference Catalogue of Bright Galaxies (RC3) with a relatively face-on inclination ($\\theta\\leq30{\\deg}$). Specifically, we measured the spiral arms' winding angle, $\\phi$, in 85 galaxies. We applied a novel black hole mass planar scaling relation involving the rotational velocities (from the literature) and pitch angles of each galaxy to predict central black hole masses. This yielded 23 galaxies, each having at least a 50% chance of hosting a central intermediate-mass black hole (IMBH), $10^2<M_\\mathrm{BH}\\leq10^5\\","authors_text":"Alister W. Graham, Benjamin L. Davis, Elena D'Onghia, Igor D. Karachentsev, Roberto Soria, Valentina E. Karachentseva, Zehao Jin","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2024-06-09T13:21:29Z","title":"Identification of Intermediate-mass Black Hole Candidates Among a Sample of Sd Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2406.05778","kind":"arxiv","version":2},"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:db926c54d15d84e02c153eb21c384d83354d2c5f88e55f66e70ebd637f32989b","target":"record","created_at":"2026-07-05T08:54:52Z","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":"a3535b2293a35f5aed164bdf254aaf27c261e81e6ffcfe1b89e82a57b1bfd13f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2024-06-09T13:21:29Z","title_canon_sha256":"efacaab451c2210cdf6cc32b77621f3fd5b5212f81b6ccfa52cedf13583c78da"},"schema_version":"1.0","source":{"id":"2406.05778","kind":"arxiv","version":2}},"canonical_sha256":"39c3c0d5df233cf78bfb7941a4c539e405b1dbecd849b840c059c011382a086d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"39c3c0d5df233cf78bfb7941a4c539e405b1dbecd849b840c059c011382a086d","first_computed_at":"2026-07-05T08:54:52.074518Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:54:52.074518Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gOG0yXCZyXRyzZdShaMG0+wzY373OGAvOeax96oPIXyJgq3ACTKnTkQn1NpjxsSqURzQjjuhmQVlPUchP43fCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T08:54:52.074924Z","signed_message":"canonical_sha256_bytes"},"source_id":"2406.05778","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:db926c54d15d84e02c153eb21c384d83354d2c5f88e55f66e70ebd637f32989b","sha256:80b204723ea2d4d6bdd2378c1437efc3bd0b2c8fe5283119902d414068355b5e"],"state_sha256":"fadbe3069b0e1c4778c7391cdac1c4a1ea893bb2cc80dda0e3000a3f431e2c80"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fgS2yG41TUq2/0fdEwRatQESW2gF9dqF9rTeRya0Xyya2Vegf1JzMvCbpg9ELSV3WIzxtejonKuzuXS8OBjBDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T10:58:42.890270Z","bundle_sha256":"d153f94d6dd19ed95cb37a2fa4e63658a23b62d173ab7cad97425f2440991056"}}