{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2003:MKY657QOOAPUTJE43SU434YYIN","short_pith_number":"pith:MKY657QO","schema_version":"1.0","canonical_sha256":"62b1eefe0e701f49a49cdca9cdf3184355b10b4f702a1b93e72cf71551bd9c41","source":{"kind":"arxiv","id":"astro-ph/0301255","version":1},"attestation_state":"computed","paper":{"title":"New Light on the Stellar Populations in IZw18: Deep Near-Infrared Imaging","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Leslie K. Hunt, Trinh X. Thuan, & Yuri I. Izotov","submitted_at":"2003-01-14T14:13:51Z","abstract_excerpt":"We present deep JHK images of IZw18, the most metal-deficient Blue Compact Dwarf galaxy known, and analyze them in conjunction with archival HST/WFPC2 optical images. To investigate the stellar populations, we have divided the main body of IZw18 into eight regions, and fit the optical, near-infrared (NIR), and hybrid optical-NIR colors of these and the C component with evolutionary synthesis models. The composite best fit is obtained for an age for evolved stellar populations of <= 200Myr; fits with an older age of <= 500Myr are less likely but possible. Our data show no evidence for stellar p"},"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":"astro-ph/0301255","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-01-14T14:13:51Z","cross_cats_sorted":[],"title_canon_sha256":"1753e0872f462f76a3740f2df93323eb4d206581a79f3ca5327a0c7646a3c19a","abstract_canon_sha256":"32749bdc28677652ccf40cfb0a1b1aae6199c8cee10abf3173396794e284f400"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:33.945130Z","signature_b64":"nBloD5E1ne/let2JlA/JD/IWy1vFN0j4Ksp8FC6AzJpQubSdrw30XZUP1jKvRoKUjzLsg94AWwKD8FW7o7TRDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"62b1eefe0e701f49a49cdca9cdf3184355b10b4f702a1b93e72cf71551bd9c41","last_reissued_at":"2026-05-18T01:07:33.944497Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:33.944497Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"New Light on the Stellar Populations in IZw18: Deep Near-Infrared Imaging","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Leslie K. Hunt, Trinh X. Thuan, & Yuri I. Izotov","submitted_at":"2003-01-14T14:13:51Z","abstract_excerpt":"We present deep JHK images of IZw18, the most metal-deficient Blue Compact Dwarf galaxy known, and analyze them in conjunction with archival HST/WFPC2 optical images. To investigate the stellar populations, we have divided the main body of IZw18 into eight regions, and fit the optical, near-infrared (NIR), and hybrid optical-NIR colors of these and the C component with evolutionary synthesis models. The composite best fit is obtained for an age for evolved stellar populations of <= 200Myr; fits with an older age of <= 500Myr are less likely but possible. Our data show no evidence for stellar p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0301255","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":"astro-ph/0301255","created_at":"2026-05-18T01:07:33.944595+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0301255v1","created_at":"2026-05-18T01:07:33.944595+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0301255","created_at":"2026-05-18T01:07:33.944595+00:00"},{"alias_kind":"pith_short_12","alias_value":"MKY657QOOAPU","created_at":"2026-05-18T12:25:52.051335+00:00"},{"alias_kind":"pith_short_16","alias_value":"MKY657QOOAPUTJE4","created_at":"2026-05-18T12:25:52.051335+00:00"},{"alias_kind":"pith_short_8","alias_value":"MKY657QO","created_at":"2026-05-18T12:25:52.051335+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/MKY657QOOAPUTJE43SU434YYIN","json":"https://pith.science/pith/MKY657QOOAPUTJE43SU434YYIN.json","graph_json":"https://pith.science/api/pith-number/MKY657QOOAPUTJE43SU434YYIN/graph.json","events_json":"https://pith.science/api/pith-number/MKY657QOOAPUTJE43SU434YYIN/events.json","paper":"https://pith.science/paper/MKY657QO"},"agent_actions":{"view_html":"https://pith.science/pith/MKY657QOOAPUTJE43SU434YYIN","download_json":"https://pith.science/pith/MKY657QOOAPUTJE43SU434YYIN.json","view_paper":"https://pith.science/paper/MKY657QO","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0301255&json=true","fetch_graph":"https://pith.science/api/pith-number/MKY657QOOAPUTJE43SU434YYIN/graph.json","fetch_events":"https://pith.science/api/pith-number/MKY657QOOAPUTJE43SU434YYIN/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/MKY657QOOAPUTJE43SU434YYIN/action/timestamp_anchor","attest_storage":"https://pith.science/pith/MKY657QOOAPUTJE43SU434YYIN/action/storage_attestation","attest_author":"https://pith.science/pith/MKY657QOOAPUTJE43SU434YYIN/action/author_attestation","sign_citation":"https://pith.science/pith/MKY657QOOAPUTJE43SU434YYIN/action/citation_signature","submit_replication":"https://pith.science/pith/MKY657QOOAPUTJE43SU434YYIN/action/replication_record"}},"created_at":"2026-05-18T01:07:33.944595+00:00","updated_at":"2026-05-18T01:07:33.944595+00:00"}