{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:SIZWLTYX22FC2EV2L4PYOTKGGR","short_pith_number":"pith:SIZWLTYX","schema_version":"1.0","canonical_sha256":"923365cf17d68a2d12ba5f1f874d4634595979c25f55b3aa76ce31befee61157","source":{"kind":"arxiv","id":"1506.01097","version":1},"attestation_state":"computed","paper":{"title":"Photometric Evidence of an Intermediate-age Stellar Population in the Inner Bulge of M31","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Abhijit Saha, Benjamin F. Williams, Hui Dong, Julianne J. Dalcanton, Knut A. G. Olsen, Q. Daniel Wang, Tod R. Lauer, Zhiyuan Li","submitted_at":"2015-06-03T00:46:43Z","abstract_excerpt":"We explore the assembly history of the M31 bulge within a projected major-axis radius of 180\" (~680 pc) by studying its stellar populations in Hubble Space Telescope WFC3 and ACS observations. Colors formed by comparing near-ultraviolet vs. optical bands are found to become bluer with increasing major-axis radius, which is opposite to that predicted if the sole sources of near-ultraviolet light were old extreme horizontal branch stars with a negative radial gradient in metallicity. Spectral energy distribution fits require a metal-rich intermediate-age stellar population (300 Myr to 1 Gyr old,"},"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":"1506.01097","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-06-03T00:46:43Z","cross_cats_sorted":[],"title_canon_sha256":"5e12d8b55fba2d85c536e3d7e8def9368bbc2b60473d16c6dee8c8e27542c7ae","abstract_canon_sha256":"de69b76f18cd396998350d4e3fd0e4c19f4b1095f2bf359cc1fbd6b3ce81fadb"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:25.081274Z","signature_b64":"Czy21XzEXR6NY7jyihL71d2PAtvAb6J6qOOcuMKiXRe/HhG5nW3fAIBrc/qfUNxlF+a9gDmNAs5k9nz2wNxeAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"923365cf17d68a2d12ba5f1f874d4634595979c25f55b3aa76ce31befee61157","last_reissued_at":"2026-05-18T01:58:25.080829Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:25.080829Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Photometric Evidence of an Intermediate-age Stellar Population in the Inner Bulge of M31","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Abhijit Saha, Benjamin F. Williams, Hui Dong, Julianne J. Dalcanton, Knut A. G. Olsen, Q. Daniel Wang, Tod R. Lauer, Zhiyuan Li","submitted_at":"2015-06-03T00:46:43Z","abstract_excerpt":"We explore the assembly history of the M31 bulge within a projected major-axis radius of 180\" (~680 pc) by studying its stellar populations in Hubble Space Telescope WFC3 and ACS observations. Colors formed by comparing near-ultraviolet vs. optical bands are found to become bluer with increasing major-axis radius, which is opposite to that predicted if the sole sources of near-ultraviolet light were old extreme horizontal branch stars with a negative radial gradient in metallicity. Spectral energy distribution fits require a metal-rich intermediate-age stellar population (300 Myr to 1 Gyr old,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.01097","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":"1506.01097","created_at":"2026-05-18T01:58:25.080888+00:00"},{"alias_kind":"arxiv_version","alias_value":"1506.01097v1","created_at":"2026-05-18T01:58:25.080888+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.01097","created_at":"2026-05-18T01:58:25.080888+00:00"},{"alias_kind":"pith_short_12","alias_value":"SIZWLTYX22FC","created_at":"2026-05-18T12:29:42.218222+00:00"},{"alias_kind":"pith_short_16","alias_value":"SIZWLTYX22FC2EV2","created_at":"2026-05-18T12:29:42.218222+00:00"},{"alias_kind":"pith_short_8","alias_value":"SIZWLTYX","created_at":"2026-05-18T12:29:42.218222+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/SIZWLTYX22FC2EV2L4PYOTKGGR","json":"https://pith.science/pith/SIZWLTYX22FC2EV2L4PYOTKGGR.json","graph_json":"https://pith.science/api/pith-number/SIZWLTYX22FC2EV2L4PYOTKGGR/graph.json","events_json":"https://pith.science/api/pith-number/SIZWLTYX22FC2EV2L4PYOTKGGR/events.json","paper":"https://pith.science/paper/SIZWLTYX"},"agent_actions":{"view_html":"https://pith.science/pith/SIZWLTYX22FC2EV2L4PYOTKGGR","download_json":"https://pith.science/pith/SIZWLTYX22FC2EV2L4PYOTKGGR.json","view_paper":"https://pith.science/paper/SIZWLTYX","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1506.01097&json=true","fetch_graph":"https://pith.science/api/pith-number/SIZWLTYX22FC2EV2L4PYOTKGGR/graph.json","fetch_events":"https://pith.science/api/pith-number/SIZWLTYX22FC2EV2L4PYOTKGGR/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/SIZWLTYX22FC2EV2L4PYOTKGGR/action/timestamp_anchor","attest_storage":"https://pith.science/pith/SIZWLTYX22FC2EV2L4PYOTKGGR/action/storage_attestation","attest_author":"https://pith.science/pith/SIZWLTYX22FC2EV2L4PYOTKGGR/action/author_attestation","sign_citation":"https://pith.science/pith/SIZWLTYX22FC2EV2L4PYOTKGGR/action/citation_signature","submit_replication":"https://pith.science/pith/SIZWLTYX22FC2EV2L4PYOTKGGR/action/replication_record"}},"created_at":"2026-05-18T01:58:25.080888+00:00","updated_at":"2026-05-18T01:58:25.080888+00:00"}