{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:T64TV3HIUQXV7DF7ME24MYLYEP","short_pith_number":"pith:T64TV3HI","schema_version":"1.0","canonical_sha256":"9fb93aece8a42f5f8cbf6135c6617823ff1697c95bf49b8717c0090d6ddb0b15","source":{"kind":"arxiv","id":"1307.2259","version":2},"attestation_state":"computed","paper":{"title":"New Measurements of the Ionizing Ultraviolet Background over 2 < z < 5 and Implications for Hydrogen Reionization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"George D. Becker, James S. Bolton","submitted_at":"2013-07-08T20:24:22Z","abstract_excerpt":"We present new measurements of the intensity of the ionizing ultraviolet background and the global emissivity of ionizing photons over 2 < z < 5. Our results are based on a suite of updated measurements of physical properties of the high-redshift intergalactic medium (IGM), including gas temperatures and the opacity of the IGM to Ly-alpha and ionizing photons. Consistent with previous works, we find a relatively flat hydrogen photoionization rate over 2 < z < 5, although our measurements are roughly a factor of two higher than the 2008 values of Faucher-Giguere et al., due primarily to our low"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1307.2259","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-07-08T20:24:22Z","cross_cats_sorted":[],"title_canon_sha256":"c583680a56239e6d4fbf628653a8743250c5eee735384a84470389d7aef1ead8","abstract_canon_sha256":"4e458869d2567260b613e9e291c3f869829f2100cc2d2ab66d47fa038b7f2b51"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:48:58.492785Z","signature_b64":"q1q662PMXGCieQvgWkjzCE0Z8yJ5Sbhqhsj9TnQFmwcutFz/022ABd/huW3QMRVOX+/hv6DIVPiRRQg2XjFmAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9fb93aece8a42f5f8cbf6135c6617823ff1697c95bf49b8717c0090d6ddb0b15","last_reissued_at":"2026-05-18T01:48:58.492171Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:48:58.492171Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"New Measurements of the Ionizing Ultraviolet Background over 2 < z < 5 and Implications for Hydrogen Reionization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"George D. Becker, James S. Bolton","submitted_at":"2013-07-08T20:24:22Z","abstract_excerpt":"We present new measurements of the intensity of the ionizing ultraviolet background and the global emissivity of ionizing photons over 2 < z < 5. Our results are based on a suite of updated measurements of physical properties of the high-redshift intergalactic medium (IGM), including gas temperatures and the opacity of the IGM to Ly-alpha and ionizing photons. Consistent with previous works, we find a relatively flat hydrogen photoionization rate over 2 < z < 5, although our measurements are roughly a factor of two higher than the 2008 values of Faucher-Giguere et al., due primarily to our low"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.2259","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1307.2259","created_at":"2026-05-18T01:48:58.492265+00:00"},{"alias_kind":"arxiv_version","alias_value":"1307.2259v2","created_at":"2026-05-18T01:48:58.492265+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.2259","created_at":"2026-05-18T01:48:58.492265+00:00"},{"alias_kind":"pith_short_12","alias_value":"T64TV3HIUQXV","created_at":"2026-05-18T12:27:59.945178+00:00"},{"alias_kind":"pith_short_16","alias_value":"T64TV3HIUQXV7DF7","created_at":"2026-05-18T12:27:59.945178+00:00"},{"alias_kind":"pith_short_8","alias_value":"T64TV3HI","created_at":"2026-05-18T12:27:59.945178+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2606.18382","citing_title":"The Lumina Project: Intergalactic Clumping and Recombination Sinks","ref_index":54,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/T64TV3HIUQXV7DF7ME24MYLYEP","json":"https://pith.science/pith/T64TV3HIUQXV7DF7ME24MYLYEP.json","graph_json":"https://pith.science/api/pith-number/T64TV3HIUQXV7DF7ME24MYLYEP/graph.json","events_json":"https://pith.science/api/pith-number/T64TV3HIUQXV7DF7ME24MYLYEP/events.json","paper":"https://pith.science/paper/T64TV3HI"},"agent_actions":{"view_html":"https://pith.science/pith/T64TV3HIUQXV7DF7ME24MYLYEP","download_json":"https://pith.science/pith/T64TV3HIUQXV7DF7ME24MYLYEP.json","view_paper":"https://pith.science/paper/T64TV3HI","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1307.2259&json=true","fetch_graph":"https://pith.science/api/pith-number/T64TV3HIUQXV7DF7ME24MYLYEP/graph.json","fetch_events":"https://pith.science/api/pith-number/T64TV3HIUQXV7DF7ME24MYLYEP/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/T64TV3HIUQXV7DF7ME24MYLYEP/action/timestamp_anchor","attest_storage":"https://pith.science/pith/T64TV3HIUQXV7DF7ME24MYLYEP/action/storage_attestation","attest_author":"https://pith.science/pith/T64TV3HIUQXV7DF7ME24MYLYEP/action/author_attestation","sign_citation":"https://pith.science/pith/T64TV3HIUQXV7DF7ME24MYLYEP/action/citation_signature","submit_replication":"https://pith.science/pith/T64TV3HIUQXV7DF7ME24MYLYEP/action/replication_record"}},"created_at":"2026-05-18T01:48:58.492265+00:00","updated_at":"2026-05-18T01:48:58.492265+00:00"}