{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:YY6WY6FVEC7BZUKZJVQZM2SPKJ","short_pith_number":"pith:YY6WY6FV","canonical_record":{"source":{"id":"1508.05103","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-20T20:06:46Z","cross_cats_sorted":[],"title_canon_sha256":"0f1b702407ebc6c928f6cb4ade8745a27c563a06186e1fc81676df83a5d59187","abstract_canon_sha256":"247a91c7dc53ee7f966e53acb84ddeb426318fe593883eb885c813e7b8ce6cdd"},"schema_version":"1.0"},"canonical_sha256":"c63d6c78b520be1cd1594d61966a4f525eedb8d689857ac5ab985227367d408e","source":{"kind":"arxiv","id":"1508.05103","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.05103","created_at":"2026-05-18T01:30:55Z"},{"alias_kind":"arxiv_version","alias_value":"1508.05103v1","created_at":"2026-05-18T01:30:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.05103","created_at":"2026-05-18T01:30:55Z"},{"alias_kind":"pith_short_12","alias_value":"YY6WY6FVEC7B","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"YY6WY6FVEC7BZUKZ","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"YY6WY6FV","created_at":"2026-05-18T12:29:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:YY6WY6FVEC7BZUKZJVQZM2SPKJ","target":"record","payload":{"canonical_record":{"source":{"id":"1508.05103","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-20T20:06:46Z","cross_cats_sorted":[],"title_canon_sha256":"0f1b702407ebc6c928f6cb4ade8745a27c563a06186e1fc81676df83a5d59187","abstract_canon_sha256":"247a91c7dc53ee7f966e53acb84ddeb426318fe593883eb885c813e7b8ce6cdd"},"schema_version":"1.0"},"canonical_sha256":"c63d6c78b520be1cd1594d61966a4f525eedb8d689857ac5ab985227367d408e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:30:55.923173Z","signature_b64":"X/ypePCrBiUiEoBrAyw7lAnT7XqzzUjEuVOk6lVpsOH7MeCnXVAqQSuX2oRvQ17WalwzK0sJd7g1DBcOXHUOBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c63d6c78b520be1cd1594d61966a4f525eedb8d689857ac5ab985227367d408e","last_reissued_at":"2026-05-18T01:30:55.922598Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:30:55.922598Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1508.05103","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:30:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iMLUOFnJjJZGDLqeEXNwP44n2ohCVFW9v6c09bC8nSSu+Myy4WmrRlhT0qKiySwlyOnR06qyWbYvj0hxwYunDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T15:49:35.205586Z"},"content_sha256":"e064bfa7e352ade674e0527be04cec59e73c64a881a6e3a3a259d013c8fc7453","schema_version":"1.0","event_id":"sha256:e064bfa7e352ade674e0527be04cec59e73c64a881a6e3a3a259d013c8fc7453"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:YY6WY6FVEC7BZUKZJVQZM2SPKJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Abundance patterns in early-type galaxies: is there a 'knee' in the [Fe/H] vs. [alpha/Fe] relation?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Gallazzi, C. Chiappini, C. J. Walcher, G. Bruzual, P.R.T. Coelho, S. Charlot","submitted_at":"2015-08-20T20:06:46Z","abstract_excerpt":"Early-type galaxies (ETGs) are known to be enhanced in alpha elements, in accordance with their old ages and short formation timescales. In this contribution we aim to resolve the enrichment histories of ETGs. This means we study the abundance of Fe ([Fe/H]) and the alpha-element groups ([alpha/Fe]) separately for stars older than 9.5 Gyr ([Fe/H]o, [alpha/Fe]o) and for stars between 1.5 and 9.5 Gyr ([Fe/H]i, [alpha/Fe]i). Through extensive simulation we show that we can indeed recover the enrichment history per galaxy. We then analyze a spectroscopic sample of 2286 early-type galaxies from the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.05103","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:30:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FALwBapEwR410S+fWLyjd6sRcOaIYrrve+i7Ssp3ZsF9ig8/nPsBuptK+IZdK4zli2fp2eVqpOWOB7rTVuxUBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T15:49:35.205928Z"},"content_sha256":"28e657dc4258ba42d56b8d6d1a9d55eff50291b131149fa315fab18a39afb298","schema_version":"1.0","event_id":"sha256:28e657dc4258ba42d56b8d6d1a9d55eff50291b131149fa315fab18a39afb298"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YY6WY6FVEC7BZUKZJVQZM2SPKJ/bundle.json","state_url":"https://pith.science/pith/YY6WY6FVEC7BZUKZJVQZM2SPKJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YY6WY6FVEC7BZUKZJVQZM2SPKJ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-31T15:49:35Z","links":{"resolver":"https://pith.science/pith/YY6WY6FVEC7BZUKZJVQZM2SPKJ","bundle":"https://pith.science/pith/YY6WY6FVEC7BZUKZJVQZM2SPKJ/bundle.json","state":"https://pith.science/pith/YY6WY6FVEC7BZUKZJVQZM2SPKJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YY6WY6FVEC7BZUKZJVQZM2SPKJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:YY6WY6FVEC7BZUKZJVQZM2SPKJ","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":"247a91c7dc53ee7f966e53acb84ddeb426318fe593883eb885c813e7b8ce6cdd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-20T20:06:46Z","title_canon_sha256":"0f1b702407ebc6c928f6cb4ade8745a27c563a06186e1fc81676df83a5d59187"},"schema_version":"1.0","source":{"id":"1508.05103","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.05103","created_at":"2026-05-18T01:30:55Z"},{"alias_kind":"arxiv_version","alias_value":"1508.05103v1","created_at":"2026-05-18T01:30:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.05103","created_at":"2026-05-18T01:30:55Z"},{"alias_kind":"pith_short_12","alias_value":"YY6WY6FVEC7B","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"YY6WY6FVEC7BZUKZ","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"YY6WY6FV","created_at":"2026-05-18T12:29:52Z"}],"graph_snapshots":[{"event_id":"sha256:28e657dc4258ba42d56b8d6d1a9d55eff50291b131149fa315fab18a39afb298","target":"graph","created_at":"2026-05-18T01:30:55Z","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":"Early-type galaxies (ETGs) are known to be enhanced in alpha elements, in accordance with their old ages and short formation timescales. In this contribution we aim to resolve the enrichment histories of ETGs. This means we study the abundance of Fe ([Fe/H]) and the alpha-element groups ([alpha/Fe]) separately for stars older than 9.5 Gyr ([Fe/H]o, [alpha/Fe]o) and for stars between 1.5 and 9.5 Gyr ([Fe/H]i, [alpha/Fe]i). Through extensive simulation we show that we can indeed recover the enrichment history per galaxy. We then analyze a spectroscopic sample of 2286 early-type galaxies from the","authors_text":"A. Gallazzi, C. Chiappini, C. J. Walcher, G. Bruzual, P.R.T. Coelho, S. Charlot","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-20T20:06:46Z","title":"Abundance patterns in early-type galaxies: is there a 'knee' in the [Fe/H] vs. [alpha/Fe] relation?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.05103","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:e064bfa7e352ade674e0527be04cec59e73c64a881a6e3a3a259d013c8fc7453","target":"record","created_at":"2026-05-18T01:30:55Z","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":"247a91c7dc53ee7f966e53acb84ddeb426318fe593883eb885c813e7b8ce6cdd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-08-20T20:06:46Z","title_canon_sha256":"0f1b702407ebc6c928f6cb4ade8745a27c563a06186e1fc81676df83a5d59187"},"schema_version":"1.0","source":{"id":"1508.05103","kind":"arxiv","version":1}},"canonical_sha256":"c63d6c78b520be1cd1594d61966a4f525eedb8d689857ac5ab985227367d408e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c63d6c78b520be1cd1594d61966a4f525eedb8d689857ac5ab985227367d408e","first_computed_at":"2026-05-18T01:30:55.922598Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:30:55.922598Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"X/ypePCrBiUiEoBrAyw7lAnT7XqzzUjEuVOk6lVpsOH7MeCnXVAqQSuX2oRvQ17WalwzK0sJd7g1DBcOXHUOBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:30:55.923173Z","signed_message":"canonical_sha256_bytes"},"source_id":"1508.05103","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e064bfa7e352ade674e0527be04cec59e73c64a881a6e3a3a259d013c8fc7453","sha256:28e657dc4258ba42d56b8d6d1a9d55eff50291b131149fa315fab18a39afb298"],"state_sha256":"396fd3affe80f81bf8168abc25d44ec610157f55ae3a32ff95820051e71c1eb1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/oNCDPxOx16XD90VUJYDimVsP2mBE4EkuGAbo1DuBACBOm2yPR7fbDL2uvduFAhZ1KFU1hkTnSNOHmXujY1ZDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T15:49:35.207851Z","bundle_sha256":"a7f8c905c76ed17f3b1135b918bd67536eeb5628ae380e2e3c8e4a31d497b3b4"}}