{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2008:ZRDLEKAQRP4VC6NFQOEVZQZSHO","short_pith_number":"pith:ZRDLEKAQ","schema_version":"1.0","canonical_sha256":"cc46b228108bf95179a583895cc3323b932a49ca7a82b85480b84226d2da0c43","source":{"kind":"arxiv","id":"0812.3647","version":1},"attestation_state":"computed","paper":{"title":"Spiral density wave triggering of star formation in SA and SAB galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"CRyA, Eric E. Mart\\'inez-Garc\\'ia (1), Gustavo Bruzual-A. (2) ((1) UNAM, M\\'exico; (2) CIDA, Rosa Amelia Gonz\\'alez-L\\'opezlira (1), Venezuela)","submitted_at":"2008-12-18T20:13:14Z","abstract_excerpt":"Azimuthal color (age) gradients across spiral arms are one of the main predictions of density wave theory; gradients are the result of star formation triggering by the spiral waves. In a sample of 13 spiral galaxies of types A and AB, we find that 10 of them present regions that match the theoretical predictions. By comparing the observed gradients with stellar population synthesis models, the pattern speed and the location of major resonances have been determined. The resonance positions inferred from this analysis indicate that 9 of the objects have spiral arms that extend to the outer Lindb"},"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":"0812.3647","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-18T20:13:14Z","cross_cats_sorted":[],"title_canon_sha256":"b6219ee3d615e33029fb4d8e7b83dac799dd9d0bb4ed37bd9233ef109f0aaf1b","abstract_canon_sha256":"48fbd9608891b0fea5b5c7944aa13468f8d3ca2823c38f4cd951e09ca5ca4d1a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:24.361073Z","signature_b64":"Tnwx1Rpc79NsDctIYFFo7e2iOLXhVz/YvkzZBRhI+Gr6MW8XDykdKqp5w6AkZyjaholJtLGfg/45ipVSQC1uCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cc46b228108bf95179a583895cc3323b932a49ca7a82b85480b84226d2da0c43","last_reissued_at":"2026-05-18T04:29:24.360640Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:24.360640Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Spiral density wave triggering of star formation in SA and SAB galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"CRyA, Eric E. Mart\\'inez-Garc\\'ia (1), Gustavo Bruzual-A. (2) ((1) UNAM, M\\'exico; (2) CIDA, Rosa Amelia Gonz\\'alez-L\\'opezlira (1), Venezuela)","submitted_at":"2008-12-18T20:13:14Z","abstract_excerpt":"Azimuthal color (age) gradients across spiral arms are one of the main predictions of density wave theory; gradients are the result of star formation triggering by the spiral waves. In a sample of 13 spiral galaxies of types A and AB, we find that 10 of them present regions that match the theoretical predictions. By comparing the observed gradients with stellar population synthesis models, the pattern speed and the location of major resonances have been determined. The resonance positions inferred from this analysis indicate that 9 of the objects have spiral arms that extend to the outer Lindb"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.3647","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":"0812.3647","created_at":"2026-05-18T04:29:24.360698+00:00"},{"alias_kind":"arxiv_version","alias_value":"0812.3647v1","created_at":"2026-05-18T04:29:24.360698+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.3647","created_at":"2026-05-18T04:29:24.360698+00:00"},{"alias_kind":"pith_short_12","alias_value":"ZRDLEKAQRP4V","created_at":"2026-05-18T12:25:58.018023+00:00"},{"alias_kind":"pith_short_16","alias_value":"ZRDLEKAQRP4VC6NF","created_at":"2026-05-18T12:25:58.018023+00:00"},{"alias_kind":"pith_short_8","alias_value":"ZRDLEKAQ","created_at":"2026-05-18T12:25:58.018023+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/ZRDLEKAQRP4VC6NFQOEVZQZSHO","json":"https://pith.science/pith/ZRDLEKAQRP4VC6NFQOEVZQZSHO.json","graph_json":"https://pith.science/api/pith-number/ZRDLEKAQRP4VC6NFQOEVZQZSHO/graph.json","events_json":"https://pith.science/api/pith-number/ZRDLEKAQRP4VC6NFQOEVZQZSHO/events.json","paper":"https://pith.science/paper/ZRDLEKAQ"},"agent_actions":{"view_html":"https://pith.science/pith/ZRDLEKAQRP4VC6NFQOEVZQZSHO","download_json":"https://pith.science/pith/ZRDLEKAQRP4VC6NFQOEVZQZSHO.json","view_paper":"https://pith.science/paper/ZRDLEKAQ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0812.3647&json=true","fetch_graph":"https://pith.science/api/pith-number/ZRDLEKAQRP4VC6NFQOEVZQZSHO/graph.json","fetch_events":"https://pith.science/api/pith-number/ZRDLEKAQRP4VC6NFQOEVZQZSHO/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ZRDLEKAQRP4VC6NFQOEVZQZSHO/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ZRDLEKAQRP4VC6NFQOEVZQZSHO/action/storage_attestation","attest_author":"https://pith.science/pith/ZRDLEKAQRP4VC6NFQOEVZQZSHO/action/author_attestation","sign_citation":"https://pith.science/pith/ZRDLEKAQRP4VC6NFQOEVZQZSHO/action/citation_signature","submit_replication":"https://pith.science/pith/ZRDLEKAQRP4VC6NFQOEVZQZSHO/action/replication_record"}},"created_at":"2026-05-18T04:29:24.360698+00:00","updated_at":"2026-05-18T04:29:24.360698+00:00"}