{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2005:AFAKYYKZY7NHW7IWZVCRSXWNRF","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":"810202a3027d8794dc78036f260b10238b5fcfac85f319f66a1d5d6bf257dc79","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-06-29T10:20:18Z","title_canon_sha256":"447d61d196317fff23cf496f4c39f138161a6410053cde31b9458e6da966a140"},"schema_version":"1.0","source":{"id":"astro-ph/0506718","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0506718","created_at":"2026-07-04T16:52:41Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0506718v1","created_at":"2026-07-04T16:52:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0506718","created_at":"2026-07-04T16:52:41Z"},{"alias_kind":"pith_short_12","alias_value":"AFAKYYKZY7NH","created_at":"2026-07-04T16:52:41Z"},{"alias_kind":"pith_short_16","alias_value":"AFAKYYKZY7NHW7IW","created_at":"2026-07-04T16:52:41Z"},{"alias_kind":"pith_short_8","alias_value":"AFAKYYKZ","created_at":"2026-07-04T16:52:41Z"}],"graph_snapshots":[{"event_id":"sha256:6b4e01580f7a7f8f66e7b4603cc6fcf0061ed2f80908f66638e69d21104e7147","target":"graph","created_at":"2026-07-04T16:52:41Z","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/astro-ph/0506718/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This paper presents the results of a detailed X-ray spectral analysis of a sample of 123 X-ray sources (46 being type-1 AGN and 28 type-2 AGN) detected with XMM-Newton in the Lockman Hole field. Using a single power law model our sources' average spectral slope hardens at faint 0.5-2 keV fluxes but not at faint 2-10 keV fluxes. We explain the effect in terms of an increase in X-ray absorption at faint fluxes. The average spectral slope of our sources is ~1.9 with an intrinsic dispersion of ~0.28. We detected X-ray absorption in 37% of the sources, ~10% in type-1 AGN and ~77% in type-2 AGN. Usi","authors_text":"A. C. Fabian, A. Streblyanska, F. J. Carrera, G. Hasinger, I. Lehmann, M. T. Ceballos, S. Mateos, X. Barcons","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2005-06-29T10:20:18Z","title":"XMM-Newton observations of the Lockman Hole IV: spectra of the brightest AGN"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0506718","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:c0fd91fa0f2f4716bde1c2c6ac23e9cb4645147fbac40d0143556b512124e7a0","target":"record","created_at":"2026-07-04T16:52:41Z","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":"810202a3027d8794dc78036f260b10238b5fcfac85f319f66a1d5d6bf257dc79","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-06-29T10:20:18Z","title_canon_sha256":"447d61d196317fff23cf496f4c39f138161a6410053cde31b9458e6da966a140"},"schema_version":"1.0","source":{"id":"astro-ph/0506718","kind":"arxiv","version":1}},"canonical_sha256":"0140ac6159c7da7b7d16cd45195ecd897f839b2c82fde7066000230d246db047","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0140ac6159c7da7b7d16cd45195ecd897f839b2c82fde7066000230d246db047","first_computed_at":"2026-07-04T16:52:41.975656Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:52:41.975656Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zlLHm968Xm0exTnjuGDCsiA05PZ5Ai3akkVKDcwKd3b3jgq6BblqDKj2fpV1UEvhnMJeaBxqcoVpFYAXZIZoDg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:52:41.976027Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0506718","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c0fd91fa0f2f4716bde1c2c6ac23e9cb4645147fbac40d0143556b512124e7a0","sha256:6b4e01580f7a7f8f66e7b4603cc6fcf0061ed2f80908f66638e69d21104e7147"],"state_sha256":"7ac55c0d22f6f935df1ebb43bd2c6ef98dcb78b0539f0e3acf3671b17c9e1807"}