{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:VAAJNNY67DU6IWTB63XQYYQ3OA","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":"fd933e1ca22f7fceb4f78b67460484f82cf69a1c5847e421393e083b49f829ee","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2002-10-24T20:00:03Z","title_canon_sha256":"31185d4624ae5e91ee8290f2ba4c4fa075e6c1b5aa30829885f26d5a1c0e3625"},"schema_version":"1.0","source":{"id":"astro-ph/0210552","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0210552","created_at":"2026-07-04T16:31:02Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0210552v1","created_at":"2026-07-04T16:31:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0210552","created_at":"2026-07-04T16:31:02Z"},{"alias_kind":"pith_short_12","alias_value":"VAAJNNY67DU6","created_at":"2026-07-04T16:31:02Z"},{"alias_kind":"pith_short_16","alias_value":"VAAJNNY67DU6IWTB","created_at":"2026-07-04T16:31:02Z"},{"alias_kind":"pith_short_8","alias_value":"VAAJNNY6","created_at":"2026-07-04T16:31:02Z"}],"graph_snapshots":[{"event_id":"sha256:1019dcaaefa368fca2c57279cb493f964b8898efb617e2dd467ab5ea2c56bbd2","target":"graph","created_at":"2026-07-04T16:31:02Z","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/0210552/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present X-ray spectral analyses of the three z>4 Active Galactic Nuclei (AGNs) thus far spectroscopically identified in the Chandra Deep Field-North Survey, at redshifts of 5.186, 4.424, and 4.137. These analyses are made possible by the extremely deep exposure (2 Ms) and the low Chandra background. The rest-frame 2.5-40 keV spectra are the first for optically faint (two of the three sources have I>24) z>4 AGNs. The z=5.186 quasar is well fitted by a power-law model with photon index Gamma=1.8+/-0.3, consistent with those of lower-redshift, unobscured AGNs. The other two AGNs have flatter e","authors_text":"A.E. Hornschemeier (2), Baltimore, C. Vignali (1), D.M. Alexander (1), D.P. Schneider (1), F.E. Bauer (1), G.P. Garmire (1) ((1) Department of Astronomy & Astrophysics, Johns Hopkins University, The Pennsylvania State University, University Park, USA), USA; (2) Department of Physics & Astronomy, W.N. Brandt (1)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2002-10-24T20:00:03Z","title":"The Chandra Deep Field-North Survey. XVI. The X-ray properties of moderate-luminosity Active Galaxies at z>4"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0210552","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:e64d6104998990ab38ad2729357a39b24a6609824cf7a1eb281f3fbeca19b665","target":"record","created_at":"2026-07-04T16:31:02Z","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":"fd933e1ca22f7fceb4f78b67460484f82cf69a1c5847e421393e083b49f829ee","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2002-10-24T20:00:03Z","title_canon_sha256":"31185d4624ae5e91ee8290f2ba4c4fa075e6c1b5aa30829885f26d5a1c0e3625"},"schema_version":"1.0","source":{"id":"astro-ph/0210552","kind":"arxiv","version":1}},"canonical_sha256":"a80096b71ef8e9e45a61f6ef0c621b702934994d2f1cf651b3ca75bb062dcf92","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a80096b71ef8e9e45a61f6ef0c621b702934994d2f1cf651b3ca75bb062dcf92","first_computed_at":"2026-07-04T16:31:02.269399Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:31:02.269399Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HCbWEtJYiNA45j8kBZNFFhwpb3nZpQX49a5a9F4C2axlyY/v3hTW0kw9PuAVW5BQ7dnnTYO9aQM7reKxhS1rBA==","signature_status":"signed_v1","signed_at":"2026-07-04T16:31:02.269960Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0210552","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e64d6104998990ab38ad2729357a39b24a6609824cf7a1eb281f3fbeca19b665","sha256:1019dcaaefa368fca2c57279cb493f964b8898efb617e2dd467ab5ea2c56bbd2"],"state_sha256":"bed9a91a38843ee4633f5c5da9bc61b6b59bf3df6db233c71ac6fb20f52e6134"}