{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:7WWZLMTSNE5H3VJXWMVVISEQRE","short_pith_number":"pith:7WWZLMTS","schema_version":"1.0","canonical_sha256":"fdad95b272693a7dd537b32b5448908917597290b03dff6836ddfefced6f7c13","source":{"kind":"arxiv","id":"1504.02742","version":1},"attestation_state":"computed","paper":{"title":"Population III Stars in I Zw 18","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"13388, CNRS, France), Greenbelt, Ivan Hubeny (University of Arizona, Jean-Claude Bouret (Aix Marseille Universit\\'e, Laboratoire d'Astrophysique de Marseille, Marseille, MD 20771, Sally Heap (NASA Goddard Space Flight Center, UMR 7326, USA)","submitted_at":"2015-04-10T17:25:33Z","abstract_excerpt":"Ultraviolet and 21-cm observations suggest that the extremely low-metallicity galaxy, I Zw 18, is a stream-fed galaxy containing a \"pocket\" of pristine stars responsible for producing nebular He II recombination emission observed in I Zw18-NW. Far-UV spectra by Hubble/COS and the Far Ultraviolet Spectroscopic Explorer (FUSE) make this suggestion conclusive by demonstrating that the spectrum of I Zw 18-NW shows no metal lines like O VI 1032, 1038 of comparable ionization as the He II recombination emission."},"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":"1504.02742","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-04-10T17:25:33Z","cross_cats_sorted":[],"title_canon_sha256":"caa203d410767dffff4795c3c73818fec3f63bdb85b9b207c6c73660f3baa45f","abstract_canon_sha256":"caa046fa8ea9a5d80efc04f83703c0cd09f14d7c1df7d93ebe4d2e02db9908d5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:19:06.728356Z","signature_b64":"Dix4DBSZW65fG3qMl9Isp8wtEHfMVU9a1OmlCgWmU2yvNlxXP9fNbBmu4RfAEUiosm4U1PX+1sc/wU3pgF4cBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fdad95b272693a7dd537b32b5448908917597290b03dff6836ddfefced6f7c13","last_reissued_at":"2026-05-18T02:19:06.727920Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:19:06.727920Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Population III Stars in I Zw 18","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"13388, CNRS, France), Greenbelt, Ivan Hubeny (University of Arizona, Jean-Claude Bouret (Aix Marseille Universit\\'e, Laboratoire d'Astrophysique de Marseille, Marseille, MD 20771, Sally Heap (NASA Goddard Space Flight Center, UMR 7326, USA)","submitted_at":"2015-04-10T17:25:33Z","abstract_excerpt":"Ultraviolet and 21-cm observations suggest that the extremely low-metallicity galaxy, I Zw 18, is a stream-fed galaxy containing a \"pocket\" of pristine stars responsible for producing nebular He II recombination emission observed in I Zw18-NW. Far-UV spectra by Hubble/COS and the Far Ultraviolet Spectroscopic Explorer (FUSE) make this suggestion conclusive by demonstrating that the spectrum of I Zw 18-NW shows no metal lines like O VI 1032, 1038 of comparable ionization as the He II recombination emission."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.02742","kind":"arxiv","version":1},"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":"1504.02742","created_at":"2026-05-18T02:19:06.727983+00:00"},{"alias_kind":"arxiv_version","alias_value":"1504.02742v1","created_at":"2026-05-18T02:19:06.727983+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.02742","created_at":"2026-05-18T02:19:06.727983+00:00"},{"alias_kind":"pith_short_12","alias_value":"7WWZLMTSNE5H","created_at":"2026-05-18T12:29:10.953037+00:00"},{"alias_kind":"pith_short_16","alias_value":"7WWZLMTSNE5H3VJX","created_at":"2026-05-18T12:29:10.953037+00:00"},{"alias_kind":"pith_short_8","alias_value":"7WWZLMTS","created_at":"2026-05-18T12:29:10.953037+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/7WWZLMTSNE5H3VJXWMVVISEQRE","json":"https://pith.science/pith/7WWZLMTSNE5H3VJXWMVVISEQRE.json","graph_json":"https://pith.science/api/pith-number/7WWZLMTSNE5H3VJXWMVVISEQRE/graph.json","events_json":"https://pith.science/api/pith-number/7WWZLMTSNE5H3VJXWMVVISEQRE/events.json","paper":"https://pith.science/paper/7WWZLMTS"},"agent_actions":{"view_html":"https://pith.science/pith/7WWZLMTSNE5H3VJXWMVVISEQRE","download_json":"https://pith.science/pith/7WWZLMTSNE5H3VJXWMVVISEQRE.json","view_paper":"https://pith.science/paper/7WWZLMTS","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1504.02742&json=true","fetch_graph":"https://pith.science/api/pith-number/7WWZLMTSNE5H3VJXWMVVISEQRE/graph.json","fetch_events":"https://pith.science/api/pith-number/7WWZLMTSNE5H3VJXWMVVISEQRE/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/7WWZLMTSNE5H3VJXWMVVISEQRE/action/timestamp_anchor","attest_storage":"https://pith.science/pith/7WWZLMTSNE5H3VJXWMVVISEQRE/action/storage_attestation","attest_author":"https://pith.science/pith/7WWZLMTSNE5H3VJXWMVVISEQRE/action/author_attestation","sign_citation":"https://pith.science/pith/7WWZLMTSNE5H3VJXWMVVISEQRE/action/citation_signature","submit_replication":"https://pith.science/pith/7WWZLMTSNE5H3VJXWMVVISEQRE/action/replication_record"}},"created_at":"2026-05-18T02:19:06.727983+00:00","updated_at":"2026-05-18T02:19:06.727983+00:00"}