{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:2ECQW4K7EALTSINQC6W2BTEIHX","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"96231807986825dca0381956723ed9eb08940d5b89242e2a619e5d21386bb884","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-08T11:15:58Z","title_canon_sha256":"c5eb1df834aea16f65af29508ef98f5e728d5fc35cad36d1bffaecf259426cc7"},"schema_version":"1.0","source":{"id":"1401.1664","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.1664","created_at":"2026-05-18T02:49:30Z"},{"alias_kind":"arxiv_version","alias_value":"1401.1664v1","created_at":"2026-05-18T02:49:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.1664","created_at":"2026-05-18T02:49:30Z"},{"alias_kind":"pith_short_12","alias_value":"2ECQW4K7EALT","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_16","alias_value":"2ECQW4K7EALTSINQ","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_8","alias_value":"2ECQW4K7","created_at":"2026-05-18T12:28:09Z"}],"graph_snapshots":[{"event_id":"sha256:a9b74a08055a569954932e7078447c64f9df63a06b39572de440f6fe3663b631","target":"graph","created_at":"2026-05-18T02:49:30Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"In order to probe the inside-out formation of the most massive galaxies in the Universe, we have explored the radial (0.1 < R < 8 kpc) variation of the spectral energy distribution (SED) of M87 from UV to IR. For this purpose, we have combined high resolution data in 16 different bands. Our analysis indicate that the age of the stellar population of M87 remains almost unchanged with radius. However, the metallicity ([Z/H]) profile presents three different zones: the innermost kpc shows a plateau with supersolar metallicity, followed by a decline in metallicity down to 5 kpc and another plateau","authors_text":"Ignacio Trujillo, Jos\\'e A. Acosta-Pulido, M. Almudena Prieto, Mireia Montes","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-08T11:15:58Z","title":"Age and metallicity gradients support hierarchical formation for M87"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.1664","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:f3e6e57448d64ead6b205491e0de26ee22a788af8cf52838ca4cb4aaae0f70b5","target":"record","created_at":"2026-05-18T02:49:30Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"96231807986825dca0381956723ed9eb08940d5b89242e2a619e5d21386bb884","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-08T11:15:58Z","title_canon_sha256":"c5eb1df834aea16f65af29508ef98f5e728d5fc35cad36d1bffaecf259426cc7"},"schema_version":"1.0","source":{"id":"1401.1664","kind":"arxiv","version":1}},"canonical_sha256":"d1050b715f20173921b017ada0cc883dcb310a335fc4e35b6c618f02923bafbc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d1050b715f20173921b017ada0cc883dcb310a335fc4e35b6c618f02923bafbc","first_computed_at":"2026-05-18T02:49:30.575250Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:49:30.575250Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tPmYFIzL/Dbv3Q7EZxzY+bqdjANO5qQzGvbzAV7lENcmS9C2opLzW9U74FQqxQ26micu9EVHOsAjAN+3912aBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:49:30.575680Z","signed_message":"canonical_sha256_bytes"},"source_id":"1401.1664","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f3e6e57448d64ead6b205491e0de26ee22a788af8cf52838ca4cb4aaae0f70b5","sha256:a9b74a08055a569954932e7078447c64f9df63a06b39572de440f6fe3663b631"],"state_sha256":"f019fa245a8cb2d3e6dd80198d5245b98cacabbbbc2f2fec0d92db9e3d02b937"}