{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:IM3YIGRM6X34OO7YY3RB7LJ7BW","short_pith_number":"pith:IM3YIGRM","schema_version":"1.0","canonical_sha256":"4337841a2cf5f7c73bf8c6e21fad3f0db057d9d4281fdf27e70218c4bee78b26","source":{"kind":"arxiv","id":"1509.00856","version":2},"attestation_state":"computed","paper":{"title":"Segue 1 - A Compressed Star Formation History Before Reionization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Anna Frebel, David Webster, Joss Bland-Hawthorn","submitted_at":"2015-09-02T20:04:41Z","abstract_excerpt":"Segue 1 is the current best candidate for a \"first galaxy\", a system which experienced only a single short burst of star formation and has since remained unchanged. Here we present possible star formation scenarios which can explain its unique metallicity distribution. While the majority of stars in all other ultra-faint dwarfs (UFDs) are within 0.5 dex of the mean [Fe/H] for the galaxy, 5 of the 7 stars in Segue 1 have a spread of $\\Delta$[Fe/H] $>0.8$ dex. We show that this distribution of metallicities canot be explained by a gradual build-up of stars, but instead requires clustered star fo"},"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":"1509.00856","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-09-02T20:04:41Z","cross_cats_sorted":[],"title_canon_sha256":"7f7c63e10266a7b4d3d1189d66e1d5e2771b420ca6f1ea8dc6da25e9b213ac05","abstract_canon_sha256":"7b4c4f3fa3fa33155bf0490ced73deac4363337f00cbb5af3b57d64606477936"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:20:34.372861Z","signature_b64":"2qifXfTmXDvogtO34UNK0nVXEbpVBp7/IDXmUMHuK4wmQv9zcJ69ttSoXhAicLv0tr2MLvJReVJJZZggnWM1Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4337841a2cf5f7c73bf8c6e21fad3f0db057d9d4281fdf27e70218c4bee78b26","last_reissued_at":"2026-05-18T01:20:34.372226Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:20:34.372226Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Segue 1 - A Compressed Star Formation History Before Reionization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Anna Frebel, David Webster, Joss Bland-Hawthorn","submitted_at":"2015-09-02T20:04:41Z","abstract_excerpt":"Segue 1 is the current best candidate for a \"first galaxy\", a system which experienced only a single short burst of star formation and has since remained unchanged. Here we present possible star formation scenarios which can explain its unique metallicity distribution. While the majority of stars in all other ultra-faint dwarfs (UFDs) are within 0.5 dex of the mean [Fe/H] for the galaxy, 5 of the 7 stars in Segue 1 have a spread of $\\Delta$[Fe/H] $>0.8$ dex. We show that this distribution of metallicities canot be explained by a gradual build-up of stars, but instead requires clustered star fo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.00856","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":"1509.00856","created_at":"2026-05-18T01:20:34.372325+00:00"},{"alias_kind":"arxiv_version","alias_value":"1509.00856v2","created_at":"2026-05-18T01:20:34.372325+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.00856","created_at":"2026-05-18T01:20:34.372325+00:00"},{"alias_kind":"pith_short_12","alias_value":"IM3YIGRM6X34","created_at":"2026-05-18T12:29:25.134429+00:00"},{"alias_kind":"pith_short_16","alias_value":"IM3YIGRM6X34OO7Y","created_at":"2026-05-18T12:29:25.134429+00:00"},{"alias_kind":"pith_short_8","alias_value":"IM3YIGRM","created_at":"2026-05-18T12:29:25.134429+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/IM3YIGRM6X34OO7YY3RB7LJ7BW","json":"https://pith.science/pith/IM3YIGRM6X34OO7YY3RB7LJ7BW.json","graph_json":"https://pith.science/api/pith-number/IM3YIGRM6X34OO7YY3RB7LJ7BW/graph.json","events_json":"https://pith.science/api/pith-number/IM3YIGRM6X34OO7YY3RB7LJ7BW/events.json","paper":"https://pith.science/paper/IM3YIGRM"},"agent_actions":{"view_html":"https://pith.science/pith/IM3YIGRM6X34OO7YY3RB7LJ7BW","download_json":"https://pith.science/pith/IM3YIGRM6X34OO7YY3RB7LJ7BW.json","view_paper":"https://pith.science/paper/IM3YIGRM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1509.00856&json=true","fetch_graph":"https://pith.science/api/pith-number/IM3YIGRM6X34OO7YY3RB7LJ7BW/graph.json","fetch_events":"https://pith.science/api/pith-number/IM3YIGRM6X34OO7YY3RB7LJ7BW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/IM3YIGRM6X34OO7YY3RB7LJ7BW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/IM3YIGRM6X34OO7YY3RB7LJ7BW/action/storage_attestation","attest_author":"https://pith.science/pith/IM3YIGRM6X34OO7YY3RB7LJ7BW/action/author_attestation","sign_citation":"https://pith.science/pith/IM3YIGRM6X34OO7YY3RB7LJ7BW/action/citation_signature","submit_replication":"https://pith.science/pith/IM3YIGRM6X34OO7YY3RB7LJ7BW/action/replication_record"}},"created_at":"2026-05-18T01:20:34.372325+00:00","updated_at":"2026-05-18T01:20:34.372325+00:00"}