{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:GIQBEOUG47EICTV76DDOCNNXEE","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":"e15db9a55b985c178953b76079db2e4bb0bbdc7496acafd47747f37c24438095","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-06T17:58:44Z","title_canon_sha256":"6c1968db72150ff7c975c02158754eed772b789b5a46e3ed1211a13f52ed4848"},"schema_version":"1.0","source":{"id":"1209.1354","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.1354","created_at":"2026-05-18T01:54:39Z"},{"alias_kind":"arxiv_version","alias_value":"1209.1354v1","created_at":"2026-05-18T01:54:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.1354","created_at":"2026-05-18T01:54:39Z"},{"alias_kind":"pith_short_12","alias_value":"GIQBEOUG47EI","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"GIQBEOUG47EICTV7","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"GIQBEOUG","created_at":"2026-05-18T12:27:06Z"}],"graph_snapshots":[{"event_id":"sha256:5786fcaf5f557619fd493a8b4484d315d58570b378b3955e6216fd01e10311f1","target":"graph","created_at":"2026-05-18T01:54:39Z","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 present XMM-Newton observations of the Chandra-detected nuclear X-ray source in NGC 4561. The hard X-ray spectrum can be described by a model composed of an absorbed power-law with Gamma= 2.5^{+0.4}_{-0.3}, and column density N_H=1.9^{+0.1}_{-0.2} times 10^{22} atoms cm^{-2}. The absorption corrected luminosity of the source is L(0.2 - 10.0 keV) = 2.5 times 10^{41} ergs s^{-1}, with bolometric luminosity over 3 \\times 10^{42} ergs s^{-1}. Based on the spectrum and the luminosity, we identify the nuclear X-ray source in NGC 4561 to be an AGN, with a black hole of mass M_BH > 20,000 solar mas","authors_text":"C.Araya Salvo, F. Fiore, H. Ghosh, L. Ferrarese, S. Mathur","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-06T17:58:44Z","title":"Discovery of an active supermassive black hole in the bulge-less galaxy NGC 4561"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.1354","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":"sha256:3e7b00b7c176ccc04eb3441a68cd5e907e3e045fe3721f97ff3f18160be3df5d","target":"record","created_at":"2026-05-18T01:54:39Z","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":"e15db9a55b985c178953b76079db2e4bb0bbdc7496acafd47747f37c24438095","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-06T17:58:44Z","title_canon_sha256":"6c1968db72150ff7c975c02158754eed772b789b5a46e3ed1211a13f52ed4848"},"schema_version":"1.0","source":{"id":"1209.1354","kind":"arxiv","version":1}},"canonical_sha256":"3220123a86e7c8814ebff0c6e135b72123360a1582c8a5cf1ec14717c41a8c54","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3220123a86e7c8814ebff0c6e135b72123360a1582c8a5cf1ec14717c41a8c54","first_computed_at":"2026-05-18T01:54:39.183123Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:39.183123Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YLU1LUoUfL+XJAq69aBr/x08tq3jSRBcyEB3esMVJVu6BuTRTbqgY6oxlePG1TnhhhorPE7G3SeNZomgjBmcAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:39.183788Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.1354","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3e7b00b7c176ccc04eb3441a68cd5e907e3e045fe3721f97ff3f18160be3df5d","sha256:5786fcaf5f557619fd493a8b4484d315d58570b378b3955e6216fd01e10311f1"],"state_sha256":"aa6a901e4cc942483d02c3038cc99cc0b18e237a9a652eea8ff71f95f8acdec4"}