{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:O7OIKFEL7Q2S6HSAOE3R5BIHBL","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":"c1d57076adad9307eef31ad8ea5900619449ab998d9d3e6a3ea3ffefec28e6db","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-05-26T12:56:26Z","title_canon_sha256":"888262054f0f2aae357cd18e7b6163245e1cede0f70d8270fa05f0a67fee7224"},"schema_version":"1.0","source":{"id":"0905.4189","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.4189","created_at":"2026-05-18T02:13:31Z"},{"alias_kind":"arxiv_version","alias_value":"0905.4189v2","created_at":"2026-05-18T02:13:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.4189","created_at":"2026-05-18T02:13:31Z"},{"alias_kind":"pith_short_12","alias_value":"O7OIKFEL7Q2S","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"O7OIKFEL7Q2S6HSA","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"O7OIKFEL","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:ab95da9eb568315b7640f10aefa1b28103071c11c6f300d7a0e412b3cd417ec1","target":"graph","created_at":"2026-05-18T02:13:31Z","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":"We study the metallicities and abundance ratios of early-type galaxies in cosmological semi-analytic models (SAMs) within the hierarchical galaxy formation paradigm. To achieve this we implemented a detailed galactic chemical evolution (GCE) model and can now predict abundances of individual elements for the galaxies in the semi-analytic simulations. This is the first time a SAM with feedback from Active Galactic Nuclei (AGN) has included a chemical evolution prescription that relaxes the instantaneous recycling approximation. We find that the new models are able to reproduce the observed mass","authors_text":"(2) Space Telescope Science Institute, 3), (3) Johns Hopkins University, (4) University of Central Lancashire), Brad K. Gibson (4) ((1) Kapteyn Astronomical Institute, Mat\\'ias Arrigoni (1), Rachel S. Somerville (2, Scott C. Trager (1)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-05-26T12:56:26Z","title":"Galactic chemical evolution in hierarchical formation models - I. Early-type galaxies in the local Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.4189","kind":"arxiv","version":2},"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:e65f46b9c983442b4b35205455cfc728d90590ebec7cb5851c9c25bd56b78fd2","target":"record","created_at":"2026-05-18T02:13:31Z","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":"c1d57076adad9307eef31ad8ea5900619449ab998d9d3e6a3ea3ffefec28e6db","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-05-26T12:56:26Z","title_canon_sha256":"888262054f0f2aae357cd18e7b6163245e1cede0f70d8270fa05f0a67fee7224"},"schema_version":"1.0","source":{"id":"0905.4189","kind":"arxiv","version":2}},"canonical_sha256":"77dc85148bfc352f1e4071371e85070afc08d8f73bffa17ee644b32f928fb760","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"77dc85148bfc352f1e4071371e85070afc08d8f73bffa17ee644b32f928fb760","first_computed_at":"2026-05-18T02:13:31.982550Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:31.982550Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cYme2/F8H0zA+9V61JWfpdBpIDiVaT0X7KVMpZG7nT/lQExJ24i0K3Ft9BhMWRcq/vaJ+vl4xL6badiPcxvlCg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:31.983138Z","signed_message":"canonical_sha256_bytes"},"source_id":"0905.4189","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e65f46b9c983442b4b35205455cfc728d90590ebec7cb5851c9c25bd56b78fd2","sha256:ab95da9eb568315b7640f10aefa1b28103071c11c6f300d7a0e412b3cd417ec1"],"state_sha256":"32d032a38123b06cd4bd2493a8f48209d2d743196a7681bbc1dd95ed0ec5c361"}