{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:42CTYHDNSM37VQXMH435HFJEKL","short_pith_number":"pith:42CTYHDN","schema_version":"1.0","canonical_sha256":"e6853c1c6d9337fac2ec3f37d3952452f23520b899eed1bbef082deddb3b51aa","source":{"kind":"arxiv","id":"1511.08504","version":3},"attestation_state":"computed","paper":{"title":"The Lyman-Continuum Photon Production Efficiency xi_{ion} of z~4-5 Galaxies from IRAC-based Halpha Measurements: Implications for the Escape Fraction and Cosmic Reionization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"I. Labbe, J. Caruana, M. Franx, M. Stefanon, N. Rasappu, P. Oesch, R.J. Bouwens, R. Smit","submitted_at":"2015-11-26T21:04:13Z","abstract_excerpt":"Galaxies represent one of the preferred candidate sources to drive the reionization of the universe. Even as gains are made in mapping the galaxy UV luminosity density to z>6, significant uncertainties remain regarding the conversion to the implied ionizing emissivity. The relevant unknowns are the Lyman-continuum (LyC) photon production efficiency xi_{ion} and the escape fraction f_{esc}. As we show here, the first of these unknowns is directly measureable in z=4-5 galaxies, based on the impact the Halpha line has on the observed IRAC fluxes. By computing a LyC photon production rate from the"},"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":"1511.08504","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-11-26T21:04:13Z","cross_cats_sorted":[],"title_canon_sha256":"1cdea7edb3cbb39e571a4b9a12e403de1dd7f3165f81e21db5ea17c4573c0d43","abstract_canon_sha256":"cf95a69a53980d6f7bd61adc76c44eaa0fef01f9873785a0c355caa1108c7aa1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:59:26.295058Z","signature_b64":"Gv2fGh1RA7jQNImwrgrqqRyLBuOBmQjPKPvxPeVsjy4Vmbkb8cwaJpJXaA9xxAG9fIWvl2tRvD8j3l3FKOYDDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e6853c1c6d9337fac2ec3f37d3952452f23520b899eed1bbef082deddb3b51aa","last_reissued_at":"2026-05-18T00:59:26.294460Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:59:26.294460Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Lyman-Continuum Photon Production Efficiency xi_{ion} of z~4-5 Galaxies from IRAC-based Halpha Measurements: Implications for the Escape Fraction and Cosmic Reionization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"I. Labbe, J. Caruana, M. Franx, M. Stefanon, N. Rasappu, P. Oesch, R.J. Bouwens, R. Smit","submitted_at":"2015-11-26T21:04:13Z","abstract_excerpt":"Galaxies represent one of the preferred candidate sources to drive the reionization of the universe. Even as gains are made in mapping the galaxy UV luminosity density to z>6, significant uncertainties remain regarding the conversion to the implied ionizing emissivity. The relevant unknowns are the Lyman-continuum (LyC) photon production efficiency xi_{ion} and the escape fraction f_{esc}. As we show here, the first of these unknowns is directly measureable in z=4-5 galaxies, based on the impact the Halpha line has on the observed IRAC fluxes. By computing a LyC photon production rate from the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.08504","kind":"arxiv","version":3},"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":"1511.08504","created_at":"2026-05-18T00:59:26.294560+00:00"},{"alias_kind":"arxiv_version","alias_value":"1511.08504v3","created_at":"2026-05-18T00:59:26.294560+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.08504","created_at":"2026-05-18T00:59:26.294560+00:00"},{"alias_kind":"pith_short_12","alias_value":"42CTYHDNSM37","created_at":"2026-05-18T12:29:02.477457+00:00"},{"alias_kind":"pith_short_16","alias_value":"42CTYHDNSM37VQXM","created_at":"2026-05-18T12:29:02.477457+00:00"},{"alias_kind":"pith_short_8","alias_value":"42CTYHDN","created_at":"2026-05-18T12:29:02.477457+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/42CTYHDNSM37VQXMH435HFJEKL","json":"https://pith.science/pith/42CTYHDNSM37VQXMH435HFJEKL.json","graph_json":"https://pith.science/api/pith-number/42CTYHDNSM37VQXMH435HFJEKL/graph.json","events_json":"https://pith.science/api/pith-number/42CTYHDNSM37VQXMH435HFJEKL/events.json","paper":"https://pith.science/paper/42CTYHDN"},"agent_actions":{"view_html":"https://pith.science/pith/42CTYHDNSM37VQXMH435HFJEKL","download_json":"https://pith.science/pith/42CTYHDNSM37VQXMH435HFJEKL.json","view_paper":"https://pith.science/paper/42CTYHDN","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1511.08504&json=true","fetch_graph":"https://pith.science/api/pith-number/42CTYHDNSM37VQXMH435HFJEKL/graph.json","fetch_events":"https://pith.science/api/pith-number/42CTYHDNSM37VQXMH435HFJEKL/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/42CTYHDNSM37VQXMH435HFJEKL/action/timestamp_anchor","attest_storage":"https://pith.science/pith/42CTYHDNSM37VQXMH435HFJEKL/action/storage_attestation","attest_author":"https://pith.science/pith/42CTYHDNSM37VQXMH435HFJEKL/action/author_attestation","sign_citation":"https://pith.science/pith/42CTYHDNSM37VQXMH435HFJEKL/action/citation_signature","submit_replication":"https://pith.science/pith/42CTYHDNSM37VQXMH435HFJEKL/action/replication_record"}},"created_at":"2026-05-18T00:59:26.294560+00:00","updated_at":"2026-05-18T00:59:26.294560+00:00"}