{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2010:6RBY4PKMYXSPRW5CKFWOJQ3LEE","short_pith_number":"pith:6RBY4PKM","schema_version":"1.0","canonical_sha256":"f4438e3d4cc5e4f8dba2516ce4c36b211301bf6beaa2ea2314be6357357dd532","source":{"kind":"arxiv","id":"1011.2213","version":2},"attestation_state":"computed","paper":{"title":"Reionization constraints using Principal Component Analysis","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Andrea Ferrara, Sourav Mitra, T. Roy Choudhury","submitted_at":"2010-11-09T21:04:30Z","abstract_excerpt":"Using a semi-analytical model developed by Choudhury & Ferrara (2005) we study the observational constraints on reionization via a principal component analysis (PCA). Assuming that reionization at z>6 is primarily driven by stellar sources, we decompose the unknown function N_{ion}(z), representing the number of photons in the IGM per baryon in collapsed objects, into its principal components and constrain the latter using the photoionization rate obtained from Ly-alpha forest Gunn-Peterson optical depth, the WMAP7 electron scattering optical depth and the redshift distribution of Lyman-limit "},"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":"1011.2213","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-09T21:04:30Z","cross_cats_sorted":[],"title_canon_sha256":"15bf5e008c53768b826dad64261f225eaaab490df5681677bfe52ea0d59534a4","abstract_canon_sha256":"c9dae1a1f59b631e0ca987578fc3ddf890e7b8dac23dce411806fc1e0fb43de9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:04:49.553039Z","signature_b64":"nJqBzKL62Dx+ytj319dL0RTfqWU7oXlQHVEEIADEkDv3bg9AOfm+trGzrYCcT47pXqdh2BDmV1CU/uoxKBm8DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f4438e3d4cc5e4f8dba2516ce4c36b211301bf6beaa2ea2314be6357357dd532","last_reissued_at":"2026-05-18T02:04:49.552608Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:04:49.552608Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Reionization constraints using Principal Component Analysis","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Andrea Ferrara, Sourav Mitra, T. Roy Choudhury","submitted_at":"2010-11-09T21:04:30Z","abstract_excerpt":"Using a semi-analytical model developed by Choudhury & Ferrara (2005) we study the observational constraints on reionization via a principal component analysis (PCA). Assuming that reionization at z>6 is primarily driven by stellar sources, we decompose the unknown function N_{ion}(z), representing the number of photons in the IGM per baryon in collapsed objects, into its principal components and constrain the latter using the photoionization rate obtained from Ly-alpha forest Gunn-Peterson optical depth, the WMAP7 electron scattering optical depth and the redshift distribution of Lyman-limit "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.2213","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":"1011.2213","created_at":"2026-05-18T02:04:49.552683+00:00"},{"alias_kind":"arxiv_version","alias_value":"1011.2213v2","created_at":"2026-05-18T02:04:49.552683+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.2213","created_at":"2026-05-18T02:04:49.552683+00:00"},{"alias_kind":"pith_short_12","alias_value":"6RBY4PKMYXSP","created_at":"2026-05-18T12:26:04.259169+00:00"},{"alias_kind":"pith_short_16","alias_value":"6RBY4PKMYXSPRW5C","created_at":"2026-05-18T12:26:04.259169+00:00"},{"alias_kind":"pith_short_8","alias_value":"6RBY4PKM","created_at":"2026-05-18T12:26:04.259169+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/6RBY4PKMYXSPRW5CKFWOJQ3LEE","json":"https://pith.science/pith/6RBY4PKMYXSPRW5CKFWOJQ3LEE.json","graph_json":"https://pith.science/api/pith-number/6RBY4PKMYXSPRW5CKFWOJQ3LEE/graph.json","events_json":"https://pith.science/api/pith-number/6RBY4PKMYXSPRW5CKFWOJQ3LEE/events.json","paper":"https://pith.science/paper/6RBY4PKM"},"agent_actions":{"view_html":"https://pith.science/pith/6RBY4PKMYXSPRW5CKFWOJQ3LEE","download_json":"https://pith.science/pith/6RBY4PKMYXSPRW5CKFWOJQ3LEE.json","view_paper":"https://pith.science/paper/6RBY4PKM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1011.2213&json=true","fetch_graph":"https://pith.science/api/pith-number/6RBY4PKMYXSPRW5CKFWOJQ3LEE/graph.json","fetch_events":"https://pith.science/api/pith-number/6RBY4PKMYXSPRW5CKFWOJQ3LEE/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/6RBY4PKMYXSPRW5CKFWOJQ3LEE/action/timestamp_anchor","attest_storage":"https://pith.science/pith/6RBY4PKMYXSPRW5CKFWOJQ3LEE/action/storage_attestation","attest_author":"https://pith.science/pith/6RBY4PKMYXSPRW5CKFWOJQ3LEE/action/author_attestation","sign_citation":"https://pith.science/pith/6RBY4PKMYXSPRW5CKFWOJQ3LEE/action/citation_signature","submit_replication":"https://pith.science/pith/6RBY4PKMYXSPRW5CKFWOJQ3LEE/action/replication_record"}},"created_at":"2026-05-18T02:04:49.552683+00:00","updated_at":"2026-05-18T02:04:49.552683+00:00"}