{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:QWGSNHN3SVGYLPFOI7TRRCL5S3","short_pith_number":"pith:QWGSNHN3","schema_version":"1.0","canonical_sha256":"858d269dbb954d85bcae47e718897d96ff6e93a63b44270316fc46cabf775dc3","source":{"kind":"arxiv","id":"1310.1420","version":4},"attestation_state":"computed","paper":{"title":"Star formation efficiency and flattened gradients in M31","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"F. Robles-Valdez, L. Carigi, M. Peimbert","submitted_at":"2013-10-04T22:46:32Z","abstract_excerpt":"We present a chemical evolution model for M31 based on a pronounced inside-out formation scenario. The model reproduces the three main observational constraints of the M31 disk: the radial distributions of the total baryonic mass, the gas mass, and the O/H abundance. The model shows good agreement with the observed: SFR(r), Mstars(r), the C/H, N/H, Mg/H, Si/H, S/H, Ar/H, Cr/H, Fe/H, and Z gradients. From reproducing the observed gas mass, we find that the star formation efficiency is variable in space, for the whole disk, and is constant in time for most of the evolution (t< 12.8 Gyr). From re"},"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":"1310.1420","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-10-04T22:46:32Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"e93b8b303f9bd32c27e37d25252716cc9a076ff349f07ede5a71bb9461d02219","abstract_canon_sha256":"a718516ccb14a967a0119b56e7bcd1ec374f5ac141a065799200adc4d4fc5626"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:50:22.888999Z","signature_b64":"i4qf/4ODZC688I/O/gWIFvF91ftzapBDb11tnSDJ51sNFTBGshnOahk7havUHcHHI6J5Byk7gz183lxKoE/ODQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"858d269dbb954d85bcae47e718897d96ff6e93a63b44270316fc46cabf775dc3","last_reissued_at":"2026-05-18T02:50:22.888403Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:50:22.888403Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Star formation efficiency and flattened gradients in M31","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"F. Robles-Valdez, L. Carigi, M. Peimbert","submitted_at":"2013-10-04T22:46:32Z","abstract_excerpt":"We present a chemical evolution model for M31 based on a pronounced inside-out formation scenario. The model reproduces the three main observational constraints of the M31 disk: the radial distributions of the total baryonic mass, the gas mass, and the O/H abundance. The model shows good agreement with the observed: SFR(r), Mstars(r), the C/H, N/H, Mg/H, Si/H, S/H, Ar/H, Cr/H, Fe/H, and Z gradients. From reproducing the observed gas mass, we find that the star formation efficiency is variable in space, for the whole disk, and is constant in time for most of the evolution (t< 12.8 Gyr). From re"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.1420","kind":"arxiv","version":4},"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":"1310.1420","created_at":"2026-05-18T02:50:22.888472+00:00"},{"alias_kind":"arxiv_version","alias_value":"1310.1420v4","created_at":"2026-05-18T02:50:22.888472+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.1420","created_at":"2026-05-18T02:50:22.888472+00:00"},{"alias_kind":"pith_short_12","alias_value":"QWGSNHN3SVGY","created_at":"2026-05-18T12:27:57.521954+00:00"},{"alias_kind":"pith_short_16","alias_value":"QWGSNHN3SVGYLPFO","created_at":"2026-05-18T12:27:57.521954+00:00"},{"alias_kind":"pith_short_8","alias_value":"QWGSNHN3","created_at":"2026-05-18T12:27:57.521954+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/QWGSNHN3SVGYLPFOI7TRRCL5S3","json":"https://pith.science/pith/QWGSNHN3SVGYLPFOI7TRRCL5S3.json","graph_json":"https://pith.science/api/pith-number/QWGSNHN3SVGYLPFOI7TRRCL5S3/graph.json","events_json":"https://pith.science/api/pith-number/QWGSNHN3SVGYLPFOI7TRRCL5S3/events.json","paper":"https://pith.science/paper/QWGSNHN3"},"agent_actions":{"view_html":"https://pith.science/pith/QWGSNHN3SVGYLPFOI7TRRCL5S3","download_json":"https://pith.science/pith/QWGSNHN3SVGYLPFOI7TRRCL5S3.json","view_paper":"https://pith.science/paper/QWGSNHN3","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1310.1420&json=true","fetch_graph":"https://pith.science/api/pith-number/QWGSNHN3SVGYLPFOI7TRRCL5S3/graph.json","fetch_events":"https://pith.science/api/pith-number/QWGSNHN3SVGYLPFOI7TRRCL5S3/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/QWGSNHN3SVGYLPFOI7TRRCL5S3/action/timestamp_anchor","attest_storage":"https://pith.science/pith/QWGSNHN3SVGYLPFOI7TRRCL5S3/action/storage_attestation","attest_author":"https://pith.science/pith/QWGSNHN3SVGYLPFOI7TRRCL5S3/action/author_attestation","sign_citation":"https://pith.science/pith/QWGSNHN3SVGYLPFOI7TRRCL5S3/action/citation_signature","submit_replication":"https://pith.science/pith/QWGSNHN3SVGYLPFOI7TRRCL5S3/action/replication_record"}},"created_at":"2026-05-18T02:50:22.888472+00:00","updated_at":"2026-05-18T02:50:22.888472+00:00"}