{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:1994:S3UUSM5T72VMTNLW6UBLRPLRIG","short_pith_number":"pith:S3UUSM5T","schema_version":"1.0","canonical_sha256":"96e94933b3feaac9b576f502b8bd714184406ca6fca88bb131ceaa6efd54eaa7","source":{"kind":"arxiv","id":"astro-ph/9402015","version":1},"attestation_state":"computed","paper":{"title":"Constraints on Models of Galaxy Formation from the Evolution of Damped Ly$\\alpha$ Absorption Systems","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Guinevere Kauffmann, St\\'ephane Charlot","submitted_at":"1994-02-04T18:24:20Z","abstract_excerpt":"There is accumulating observational evidence suggesting that damped Ly$\\alpha$ absorption systems systems are the progenitors of present-day spiral galaxies. We use the observed properties of these systems to place constraints on the history of star formation in galactic disks, and on cosmological theories of structure formation in the universe. We show that the observed increase in $\\Omega_{HI}$ contributed by damped Ly$\\alpha$ systems at high redshift implies that star formation must have been considerably less efficient in the past. We also show that the data can constrain cosmological mode"},"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/9402015","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1994-02-04T18:24:20Z","cross_cats_sorted":[],"title_canon_sha256":"9f215c63c229d1dd2b945215a86913f75742ed27c8d0546675cdc544517cf41a","abstract_canon_sha256":"2f1c5052825e0e5b14dbd4de79f21e61358f752d28793dce8f477543c4adc81e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:09:21.601009Z","signature_b64":"+4gtcrHT1i7NlArP8YtnJuuw54gHJ0O/oEBySb1fsJFZImwt818V6vqqBTHIM0RS1uWSBi1s1EXR2Nf/wApbBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"96e94933b3feaac9b576f502b8bd714184406ca6fca88bb131ceaa6efd54eaa7","last_reissued_at":"2026-05-18T01:09:21.600253Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:09:21.600253Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Constraints on Models of Galaxy Formation from the Evolution of Damped Ly$\\alpha$ Absorption Systems","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Guinevere Kauffmann, St\\'ephane Charlot","submitted_at":"1994-02-04T18:24:20Z","abstract_excerpt":"There is accumulating observational evidence suggesting that damped Ly$\\alpha$ absorption systems systems are the progenitors of present-day spiral galaxies. We use the observed properties of these systems to place constraints on the history of star formation in galactic disks, and on cosmological theories of structure formation in the universe. We show that the observed increase in $\\Omega_{HI}$ contributed by damped Ly$\\alpha$ systems at high redshift implies that star formation must have been considerably less efficient in the past. We also show that the data can constrain cosmological mode"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9402015","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/9402015","created_at":"2026-05-18T01:09:21.600387+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9402015v1","created_at":"2026-05-18T01:09:21.600387+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9402015","created_at":"2026-05-18T01:09:21.600387+00:00"},{"alias_kind":"pith_short_12","alias_value":"S3UUSM5T72VM","created_at":"2026-05-18T12:25:47.102015+00:00"},{"alias_kind":"pith_short_16","alias_value":"S3UUSM5T72VMTNLW","created_at":"2026-05-18T12:25:47.102015+00:00"},{"alias_kind":"pith_short_8","alias_value":"S3UUSM5T","created_at":"2026-05-18T12:25:47.102015+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/S3UUSM5T72VMTNLW6UBLRPLRIG","json":"https://pith.science/pith/S3UUSM5T72VMTNLW6UBLRPLRIG.json","graph_json":"https://pith.science/api/pith-number/S3UUSM5T72VMTNLW6UBLRPLRIG/graph.json","events_json":"https://pith.science/api/pith-number/S3UUSM5T72VMTNLW6UBLRPLRIG/events.json","paper":"https://pith.science/paper/S3UUSM5T"},"agent_actions":{"view_html":"https://pith.science/pith/S3UUSM5T72VMTNLW6UBLRPLRIG","download_json":"https://pith.science/pith/S3UUSM5T72VMTNLW6UBLRPLRIG.json","view_paper":"https://pith.science/paper/S3UUSM5T","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/9402015&json=true","fetch_graph":"https://pith.science/api/pith-number/S3UUSM5T72VMTNLW6UBLRPLRIG/graph.json","fetch_events":"https://pith.science/api/pith-number/S3UUSM5T72VMTNLW6UBLRPLRIG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/S3UUSM5T72VMTNLW6UBLRPLRIG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/S3UUSM5T72VMTNLW6UBLRPLRIG/action/storage_attestation","attest_author":"https://pith.science/pith/S3UUSM5T72VMTNLW6UBLRPLRIG/action/author_attestation","sign_citation":"https://pith.science/pith/S3UUSM5T72VMTNLW6UBLRPLRIG/action/citation_signature","submit_replication":"https://pith.science/pith/S3UUSM5T72VMTNLW6UBLRPLRIG/action/replication_record"}},"created_at":"2026-05-18T01:09:21.600387+00:00","updated_at":"2026-05-18T01:09:21.600387+00:00"}