{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:CGBAIQR6N5H2BTSNHK2OMUERDY","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":"8338a263d82967f6b7207b91463d8b51e2c2b5dd263df42d6c6e9212c18d49bd","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-15T19:42:24Z","title_canon_sha256":"974fdcd8b08db7c24d4096af6e317b36daa5a1fe212070030ea5c342e273ac6a"},"schema_version":"1.0","source":{"id":"0906.2495","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.2495","created_at":"2026-05-18T02:13:20Z"},{"alias_kind":"arxiv_version","alias_value":"0906.2495v2","created_at":"2026-05-18T02:13:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.2495","created_at":"2026-05-18T02:13:20Z"},{"alias_kind":"pith_short_12","alias_value":"CGBAIQR6N5H2","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"CGBAIQR6N5H2BTSN","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"CGBAIQR6","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:9318f065f9371c21b0346d586decbd90109a603d329f40898f8001c79a4ad642","target":"graph","created_at":"2026-05-18T02:13:20Z","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 discuss expectations for the absorption of high-energy gamma-rays by gamma-gamma pair production with intergalactic radiation fields (IRFs) at very high redshifts (z~5-20), and the prospects thereof for probing the cosmic reionization era. For the evolving IRF, a semi-analytical model incorporating both Population II and Population III stars is employed, which is consistent with a wide variety of existing high-z observations including QSO spectral measurements, WMAP Thomson depth constraints, near-IR source count limits, etc. We find that the UV IRF below the Lyman edge energy with intensit","authors_text":"Andrea Ferrara, Benedetta Ciardi, Raffaella Schneider, Ruben Salvaterra, Susumu Inoue, Tirthankar Roy Choudhury","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-15T19:42:24Z","title":"Probing intergalactic radiation fields during cosmic reionization through gamma-ray absorption"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.2495","kind":"arxiv","version":2},"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:e5df36eec7e789755262a8f65ac9ae6a8911f71960bb2c2d1353863dd88a4bf1","target":"record","created_at":"2026-05-18T02:13:20Z","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":"8338a263d82967f6b7207b91463d8b51e2c2b5dd263df42d6c6e9212c18d49bd","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-15T19:42:24Z","title_canon_sha256":"974fdcd8b08db7c24d4096af6e317b36daa5a1fe212070030ea5c342e273ac6a"},"schema_version":"1.0","source":{"id":"0906.2495","kind":"arxiv","version":2}},"canonical_sha256":"118204423e6f4fa0ce4d3ab4e650911e00790b9fa49d478c874d42d0c07eb923","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"118204423e6f4fa0ce4d3ab4e650911e00790b9fa49d478c874d42d0c07eb923","first_computed_at":"2026-05-18T02:13:20.339197Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:20.339197Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YvGJpbcuCutl7OkKZsrWCMS++JihnobGOx/Ngrys9DMrGdBtRI0hXYP9TIUJO5Kn1f0nZHF4ktC7wwhwh+RyAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:20.339808Z","signed_message":"canonical_sha256_bytes"},"source_id":"0906.2495","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e5df36eec7e789755262a8f65ac9ae6a8911f71960bb2c2d1353863dd88a4bf1","sha256:9318f065f9371c21b0346d586decbd90109a603d329f40898f8001c79a4ad642"],"state_sha256":"d3602eb76b71da5523e6fb17c90e582cb76f715d3eeb35b6e8d6b2f7a0b5f568"}