{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:V6WV5GQDZW4G6DODIMVDADO5US","short_pith_number":"pith:V6WV5GQD","canonical_record":{"source":{"id":"0804.0803","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-04-04T20:04:07Z","cross_cats_sorted":[],"title_canon_sha256":"81dfc4110b2471c32770ea3cc1a018da1c86500c9525b7c311ac910ab584a143","abstract_canon_sha256":"822b3eab1834b9235d0cf320e4a9ebcb46f83594f1ae3a50ab9059e8a7bd5abc"},"schema_version":"1.0"},"canonical_sha256":"afad5e9a03cdb86f0dc3432a300ddda49906c3a39cf8ed2748be080f95be7c0b","source":{"kind":"arxiv","id":"0804.0803","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0804.0803","created_at":"2026-07-04T17:10:13Z"},{"alias_kind":"arxiv_version","alias_value":"0804.0803v1","created_at":"2026-07-04T17:10:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0804.0803","created_at":"2026-07-04T17:10:13Z"},{"alias_kind":"pith_short_12","alias_value":"V6WV5GQDZW4G","created_at":"2026-07-04T17:10:13Z"},{"alias_kind":"pith_short_16","alias_value":"V6WV5GQDZW4G6DOD","created_at":"2026-07-04T17:10:13Z"},{"alias_kind":"pith_short_8","alias_value":"V6WV5GQD","created_at":"2026-07-04T17:10:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:V6WV5GQDZW4G6DODIMVDADO5US","target":"record","payload":{"canonical_record":{"source":{"id":"0804.0803","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-04-04T20:04:07Z","cross_cats_sorted":[],"title_canon_sha256":"81dfc4110b2471c32770ea3cc1a018da1c86500c9525b7c311ac910ab584a143","abstract_canon_sha256":"822b3eab1834b9235d0cf320e4a9ebcb46f83594f1ae3a50ab9059e8a7bd5abc"},"schema_version":"1.0"},"canonical_sha256":"afad5e9a03cdb86f0dc3432a300ddda49906c3a39cf8ed2748be080f95be7c0b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:10:13.190804Z","signature_b64":"OYeZ8ja/Gzim8PbYzEjkdLLeO1LQWglFxdF4i45zSW+D5CEuFkNOM4V/SMPrk3m7Opa62Z3xsoPJJDlbAUwyCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"afad5e9a03cdb86f0dc3432a300ddda49906c3a39cf8ed2748be080f95be7c0b","last_reissued_at":"2026-07-04T17:10:13.190424Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:10:13.190424Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0804.0803","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T17:10:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cluuQ1C6CPMrFt8cF7jv+SvYlW48IVPgQVQhXfiq43pQMPavL7X70DQQR/6T99UdjLYKkP0iHOh71q6pmHtfBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T16:46:19.675544Z"},"content_sha256":"e3e5025cb6544246273476dcd993ef7fb4c5522b97974c5619336d9b9c6dba98","schema_version":"1.0","event_id":"sha256:e3e5025cb6544246273476dcd993ef7fb4c5522b97974c5619336d9b9c6dba98"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:V6WV5GQDZW4G6DODIMVDADO5US","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Hard X-ray Spectrum as a Probe for Black-Hole Growth in Radio-Quiet Active Galactic Nuclei","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) Tel Aviv U., (3) INAF - Roma, 4) ((1) PSU, (4) Technion), Hagai Netzer (2), Ohad Shemmer (1), Roberto Maiolino (3), Shai Kaspi (2, W.N. Brandt (1)","submitted_at":"2008-04-04T20:04:07Z","abstract_excerpt":"We study the hard-X-ray spectral properties of ten highly luminous radio-quiet (RQ) active galactic nuclei (AGNs) at z=1.3-3.2, including new XMM-Newton observations of four of these sources. We find a significant correlation between the normalized accretion rate (L/L_Edd) and the hard-X-ray photon index (Gamma) for 35 moderate-high luminosity RQ AGNs including our ten highly luminous sources. Within the limits of our sample, we show that a measurement of Gamma and L_X can provide an estimate of L/L_Edd and black-hole (BH) mass (M_BH) with a mean uncertainty of a factor of <~3 on the predicted"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0804.0803","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/0804.0803/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":"2026-07-04T17:10:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nUoH09IRlDvHMR77z3vN5QNeTmV402SscRP8tGhqX3A/OEoIpmlewVYsyxSVE11axiC8qQHl+TXtNOUkpae2DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T16:46:19.676040Z"},"content_sha256":"1e203bbd749e2175f288d0f245e1bce07b2e80e52ed2c4b7cd550aa0a44b94ce","schema_version":"1.0","event_id":"sha256:1e203bbd749e2175f288d0f245e1bce07b2e80e52ed2c4b7cd550aa0a44b94ce"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V6WV5GQDZW4G6DODIMVDADO5US/bundle.json","state_url":"https://pith.science/pith/V6WV5GQDZW4G6DODIMVDADO5US/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V6WV5GQDZW4G6DODIMVDADO5US/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":"2026-08-03T16:46:19Z","links":{"resolver":"https://pith.science/pith/V6WV5GQDZW4G6DODIMVDADO5US","bundle":"https://pith.science/pith/V6WV5GQDZW4G6DODIMVDADO5US/bundle.json","state":"https://pith.science/pith/V6WV5GQDZW4G6DODIMVDADO5US/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V6WV5GQDZW4G6DODIMVDADO5US/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:V6WV5GQDZW4G6DODIMVDADO5US","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":"822b3eab1834b9235d0cf320e4a9ebcb46f83594f1ae3a50ab9059e8a7bd5abc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-04-04T20:04:07Z","title_canon_sha256":"81dfc4110b2471c32770ea3cc1a018da1c86500c9525b7c311ac910ab584a143"},"schema_version":"1.0","source":{"id":"0804.0803","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0804.0803","created_at":"2026-07-04T17:10:13Z"},{"alias_kind":"arxiv_version","alias_value":"0804.0803v1","created_at":"2026-07-04T17:10:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0804.0803","created_at":"2026-07-04T17:10:13Z"},{"alias_kind":"pith_short_12","alias_value":"V6WV5GQDZW4G","created_at":"2026-07-04T17:10:13Z"},{"alias_kind":"pith_short_16","alias_value":"V6WV5GQDZW4G6DOD","created_at":"2026-07-04T17:10:13Z"},{"alias_kind":"pith_short_8","alias_value":"V6WV5GQD","created_at":"2026-07-04T17:10:13Z"}],"graph_snapshots":[{"event_id":"sha256:1e203bbd749e2175f288d0f245e1bce07b2e80e52ed2c4b7cd550aa0a44b94ce","target":"graph","created_at":"2026-07-04T17:10:13Z","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/0804.0803/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We study the hard-X-ray spectral properties of ten highly luminous radio-quiet (RQ) active galactic nuclei (AGNs) at z=1.3-3.2, including new XMM-Newton observations of four of these sources. We find a significant correlation between the normalized accretion rate (L/L_Edd) and the hard-X-ray photon index (Gamma) for 35 moderate-high luminosity RQ AGNs including our ten highly luminous sources. Within the limits of our sample, we show that a measurement of Gamma and L_X can provide an estimate of L/L_Edd and black-hole (BH) mass (M_BH) with a mean uncertainty of a factor of <~3 on the predicted","authors_text":"(2) Tel Aviv U., (3) INAF - Roma, 4) ((1) PSU, (4) Technion), Hagai Netzer (2), Ohad Shemmer (1), Roberto Maiolino (3), Shai Kaspi (2, W.N. Brandt (1)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-04-04T20:04:07Z","title":"The Hard X-ray Spectrum as a Probe for Black-Hole Growth in Radio-Quiet Active Galactic Nuclei"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0804.0803","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:e3e5025cb6544246273476dcd993ef7fb4c5522b97974c5619336d9b9c6dba98","target":"record","created_at":"2026-07-04T17:10:13Z","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":"822b3eab1834b9235d0cf320e4a9ebcb46f83594f1ae3a50ab9059e8a7bd5abc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-04-04T20:04:07Z","title_canon_sha256":"81dfc4110b2471c32770ea3cc1a018da1c86500c9525b7c311ac910ab584a143"},"schema_version":"1.0","source":{"id":"0804.0803","kind":"arxiv","version":1}},"canonical_sha256":"afad5e9a03cdb86f0dc3432a300ddda49906c3a39cf8ed2748be080f95be7c0b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"afad5e9a03cdb86f0dc3432a300ddda49906c3a39cf8ed2748be080f95be7c0b","first_computed_at":"2026-07-04T17:10:13.190424Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:10:13.190424Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OYeZ8ja/Gzim8PbYzEjkdLLeO1LQWglFxdF4i45zSW+D5CEuFkNOM4V/SMPrk3m7Opa62Z3xsoPJJDlbAUwyCg==","signature_status":"signed_v1","signed_at":"2026-07-04T17:10:13.190804Z","signed_message":"canonical_sha256_bytes"},"source_id":"0804.0803","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e3e5025cb6544246273476dcd993ef7fb4c5522b97974c5619336d9b9c6dba98","sha256:1e203bbd749e2175f288d0f245e1bce07b2e80e52ed2c4b7cd550aa0a44b94ce"],"state_sha256":"e0d3a3430f9dbd297d90aadbce1256809ce0d962e89df31c3a8387fc6f62b30a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"i6RXFQNw4T86g/i8/Mj3dp2ODioU3YIZCGkFZCH4JW8dJjlBD5CwHniA9FkP6N4mQo4BZw7XSMG9mGEUOpA2Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T16:46:19.679466Z","bundle_sha256":"cb584cf65961abb33a06a908b3d34daefec6c1c031a23b94cc7b5602faaf0f6d"}}