{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:UIEQ6TJ34BXZI4OBK66FUX3MZH","short_pith_number":"pith:UIEQ6TJ3","canonical_record":{"source":{"id":"0805.1919","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-05-13T20:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"c91c34de8864cab3da0eb6e4d6413ea65f95be15f91058be4436c519f9535659","abstract_canon_sha256":"c18ab490d1b5eece9f234f466fedf3c0dec46ab5e0449de61afc55170368cd7e"},"schema_version":"1.0"},"canonical_sha256":"a2090f4d3be06f9471c157bc5a5f6cc9c00b839170aeea86a12b30645dd55e15","source":{"kind":"arxiv","id":"0805.1919","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0805.1919","created_at":"2026-07-04T17:10:44Z"},{"alias_kind":"arxiv_version","alias_value":"0805.1919v1","created_at":"2026-07-04T17:10:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0805.1919","created_at":"2026-07-04T17:10:44Z"},{"alias_kind":"pith_short_12","alias_value":"UIEQ6TJ34BXZ","created_at":"2026-07-04T17:10:44Z"},{"alias_kind":"pith_short_16","alias_value":"UIEQ6TJ34BXZI4OB","created_at":"2026-07-04T17:10:44Z"},{"alias_kind":"pith_short_8","alias_value":"UIEQ6TJ3","created_at":"2026-07-04T17:10:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:UIEQ6TJ34BXZI4OBK66FUX3MZH","target":"record","payload":{"canonical_record":{"source":{"id":"0805.1919","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-05-13T20:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"c91c34de8864cab3da0eb6e4d6413ea65f95be15f91058be4436c519f9535659","abstract_canon_sha256":"c18ab490d1b5eece9f234f466fedf3c0dec46ab5e0449de61afc55170368cd7e"},"schema_version":"1.0"},"canonical_sha256":"a2090f4d3be06f9471c157bc5a5f6cc9c00b839170aeea86a12b30645dd55e15","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:10:44.698614Z","signature_b64":"wD5gpehpMyrLMJCjtf3LlT28MTyNuR1HqF9ueapAVndW5OSwQZ6XUge/DQTDgU5kvmwnYzDekAqX8iEIzasHAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a2090f4d3be06f9471c157bc5a5f6cc9c00b839170aeea86a12b30645dd55e15","last_reissued_at":"2026-07-04T17:10:44.698218Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:10:44.698218Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0805.1919","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":"2026-07-04T17:10:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cS+IEv1e071L+Ug9eJlQnRVAZqXQtre98rF3Cn7xaoEltYDr9YQ9DtZmat02JoVnhW6iwOxx4Z3zs0uwBVoMAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T05:08:26.538160Z"},"content_sha256":"e5c91fdf0509401410a6bf9585af32ec7f60715e44fbd3901364662b6dba514d","schema_version":"1.0","event_id":"sha256:e5c91fdf0509401410a6bf9585af32ec7f60715e44fbd3901364662b6dba514d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:UIEQ6TJ34BXZI4OBK66FUX3MZH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The cosmological properties of AGN in the XMM-Newton Hard Bright Survey","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Caccianiga, F. Cocchia, F. J. Carrera, H. Brunner, J.A. Tedds, M.J. Page, P. Severgnini, R. Della Ceca, S. Mateos, T. Maccacaro","submitted_at":"2008-05-13T20:00:01Z","abstract_excerpt":"(ABRIDGED) We investigate here the XLF of absorbed (Nh between 4E21 and E24 cm-2) and unabsorbed (Nh < 4E21 cm-2) AGN, the fraction of absorbed AGN as a function of Lx (and z), the intrinsic Nh distribution of the AGN population, and the XLF of Compton Thick (Nh > E24 cm-2) AGN. To carry out this investigation we have used the XMM-Newton Hard Bright Serendipitous Sample (HBSS) a complete sample of bright X-ray sources (fx > 7E-14 cgs) at high galactic latitude (|b| > 20 deg) selected in the 4.5-7.5 keV energy band. The HBSS sample is now almost completely identified (97% spectroscopic ID) and "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0805.1919","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/0805.1919/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":"2026-07-04T17:10:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4uS23It6rurhcu9JZJIeG0+EGpxWmRSwwVV4hK8eqo3zZd0aLM6JgSrtRNeQvWPSpGLYB2RMzknMI2bkKTTOBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T05:08:26.538676Z"},"content_sha256":"f9275a17027b4bc782f0afdc8d55d5d7af1026337d6ffc8a3a7fdb5927c8a288","schema_version":"1.0","event_id":"sha256:f9275a17027b4bc782f0afdc8d55d5d7af1026337d6ffc8a3a7fdb5927c8a288"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UIEQ6TJ34BXZI4OBK66FUX3MZH/bundle.json","state_url":"https://pith.science/pith/UIEQ6TJ34BXZI4OBK66FUX3MZH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UIEQ6TJ34BXZI4OBK66FUX3MZH/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":"2026-08-05T05:08:26Z","links":{"resolver":"https://pith.science/pith/UIEQ6TJ34BXZI4OBK66FUX3MZH","bundle":"https://pith.science/pith/UIEQ6TJ34BXZI4OBK66FUX3MZH/bundle.json","state":"https://pith.science/pith/UIEQ6TJ34BXZI4OBK66FUX3MZH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UIEQ6TJ34BXZI4OBK66FUX3MZH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:UIEQ6TJ34BXZI4OBK66FUX3MZH","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":"c18ab490d1b5eece9f234f466fedf3c0dec46ab5e0449de61afc55170368cd7e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-05-13T20:00:01Z","title_canon_sha256":"c91c34de8864cab3da0eb6e4d6413ea65f95be15f91058be4436c519f9535659"},"schema_version":"1.0","source":{"id":"0805.1919","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0805.1919","created_at":"2026-07-04T17:10:44Z"},{"alias_kind":"arxiv_version","alias_value":"0805.1919v1","created_at":"2026-07-04T17:10:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0805.1919","created_at":"2026-07-04T17:10:44Z"},{"alias_kind":"pith_short_12","alias_value":"UIEQ6TJ34BXZ","created_at":"2026-07-04T17:10:44Z"},{"alias_kind":"pith_short_16","alias_value":"UIEQ6TJ34BXZI4OB","created_at":"2026-07-04T17:10:44Z"},{"alias_kind":"pith_short_8","alias_value":"UIEQ6TJ3","created_at":"2026-07-04T17:10:44Z"}],"graph_snapshots":[{"event_id":"sha256:f9275a17027b4bc782f0afdc8d55d5d7af1026337d6ffc8a3a7fdb5927c8a288","target":"graph","created_at":"2026-07-04T17:10:44Z","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/0805.1919/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"(ABRIDGED) We investigate here the XLF of absorbed (Nh between 4E21 and E24 cm-2) and unabsorbed (Nh < 4E21 cm-2) AGN, the fraction of absorbed AGN as a function of Lx (and z), the intrinsic Nh distribution of the AGN population, and the XLF of Compton Thick (Nh > E24 cm-2) AGN. To carry out this investigation we have used the XMM-Newton Hard Bright Serendipitous Sample (HBSS) a complete sample of bright X-ray sources (fx > 7E-14 cgs) at high galactic latitude (|b| > 20 deg) selected in the 4.5-7.5 keV energy band. The HBSS sample is now almost completely identified (97% spectroscopic ID) and ","authors_text":"A. Caccianiga, F. Cocchia, F. J. Carrera, H. Brunner, J.A. Tedds, M.J. Page, P. Severgnini, R. Della Ceca, S. Mateos, T. Maccacaro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-05-13T20:00:01Z","title":"The cosmological properties of AGN in the XMM-Newton Hard Bright Survey"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0805.1919","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:e5c91fdf0509401410a6bf9585af32ec7f60715e44fbd3901364662b6dba514d","target":"record","created_at":"2026-07-04T17:10:44Z","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":"c18ab490d1b5eece9f234f466fedf3c0dec46ab5e0449de61afc55170368cd7e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-05-13T20:00:01Z","title_canon_sha256":"c91c34de8864cab3da0eb6e4d6413ea65f95be15f91058be4436c519f9535659"},"schema_version":"1.0","source":{"id":"0805.1919","kind":"arxiv","version":1}},"canonical_sha256":"a2090f4d3be06f9471c157bc5a5f6cc9c00b839170aeea86a12b30645dd55e15","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a2090f4d3be06f9471c157bc5a5f6cc9c00b839170aeea86a12b30645dd55e15","first_computed_at":"2026-07-04T17:10:44.698218Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:10:44.698218Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wD5gpehpMyrLMJCjtf3LlT28MTyNuR1HqF9ueapAVndW5OSwQZ6XUge/DQTDgU5kvmwnYzDekAqX8iEIzasHAg==","signature_status":"signed_v1","signed_at":"2026-07-04T17:10:44.698614Z","signed_message":"canonical_sha256_bytes"},"source_id":"0805.1919","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e5c91fdf0509401410a6bf9585af32ec7f60715e44fbd3901364662b6dba514d","sha256:f9275a17027b4bc782f0afdc8d55d5d7af1026337d6ffc8a3a7fdb5927c8a288"],"state_sha256":"175da809f64085843c409376759f19904e7b63ade44eb6ea3032391ae92f937a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"odhfKxVsNqKu81+yQcjhiQtDeWNvK20GYd4jb9tOWqdAfgD6oeCD/iMwDk/vB0qJ639l/qWNsRHBYsfW/Dz2BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T05:08:26.542597Z","bundle_sha256":"2342a8b3e9c040be8fba9b5f343b8d5210be87709fb8d9231c99cc6db21af15e"}}