{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2004:NM6XIKSXIAVYLAEQJCML7U2WYE","short_pith_number":"pith:NM6XIKSX","schema_version":"1.0","canonical_sha256":"6b3d742a57402b8580904898bfd356c129fdfae0801dcf6aebb87dbcdc428f3c","source":{"kind":"arxiv","id":"astro-ph/0410209","version":1},"attestation_state":"computed","paper":{"title":"The epochs of early-type galaxy formation as a function of environment","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C. Maraston, C. Mendes de Oliveira (MPE, D. Thomas, Garching; USM, Munich; IAG, R. Bender, Sao Paulo)","submitted_at":"2004-10-07T20:16:49Z","abstract_excerpt":"The aim of this paper is to set constraints of the epochs of early-type galaxy formation through the 'archaeology' of the stellar populations in local galaxies. Using our models of absorption line indices that account for variable abundance ratios, we derive the stellar population parameters of 124 early-type galaxies in high and low density environments. We find that all three parameters age, metallicity, and alpha/Fe ratio are correlated with velocity dispersion. We further find evidence for an influence of the environment on the stellar population properties. Massive early-type galaxies in "},"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":"astro-ph/0410209","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-10-07T20:16:49Z","cross_cats_sorted":[],"title_canon_sha256":"c3668d8f83f26a0c2728a156e66f9ee1ff3f09526dfc27cf008ed081fe79001f","abstract_canon_sha256":"694af4dc4f277cef1b5f34a027f5009d469987b57d4d43500c1f23c6601e3502"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:45:42.829410Z","signature_b64":"ooRIwVoiLGPyluSQmKr7hMYKWxzzY3DsCC7KkH8A7f+DWGcc6TqdanXSRah9NqMLXhap8Bq06rxxBaOIA5xzBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6b3d742a57402b8580904898bfd356c129fdfae0801dcf6aebb87dbcdc428f3c","last_reissued_at":"2026-07-04T15:45:42.829015Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:45:42.829015Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The epochs of early-type galaxy formation as a function of environment","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C. Maraston, C. Mendes de Oliveira (MPE, D. Thomas, Garching; USM, Munich; IAG, R. Bender, Sao Paulo)","submitted_at":"2004-10-07T20:16:49Z","abstract_excerpt":"The aim of this paper is to set constraints of the epochs of early-type galaxy formation through the 'archaeology' of the stellar populations in local galaxies. Using our models of absorption line indices that account for variable abundance ratios, we derive the stellar population parameters of 124 early-type galaxies in high and low density environments. We find that all three parameters age, metallicity, and alpha/Fe ratio are correlated with velocity dispersion. We further find evidence for an influence of the environment on the stellar population properties. Massive early-type galaxies in "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0410209","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0410209/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"astro-ph/0410209","created_at":"2026-07-04T15:45:42.829079+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0410209v1","created_at":"2026-07-04T15:45:42.829079+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0410209","created_at":"2026-07-04T15:45:42.829079+00:00"},{"alias_kind":"pith_short_12","alias_value":"NM6XIKSXIAVY","created_at":"2026-07-04T15:45:42.829079+00:00"},{"alias_kind":"pith_short_16","alias_value":"NM6XIKSXIAVYLAEQ","created_at":"2026-07-04T15:45:42.829079+00:00"},{"alias_kind":"pith_short_8","alias_value":"NM6XIKSX","created_at":"2026-07-04T15:45:42.829079+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":5,"internal_anchor_count":5,"sample":[{"citing_arxiv_id":"2607.02162","citing_title":"Resolved HI and Environmental Dynamics","ref_index":260,"is_internal_anchor":true},{"citing_arxiv_id":"2605.28903","citing_title":"The energy conditions and model selection in the local Universe","ref_index":64,"is_internal_anchor":true},{"citing_arxiv_id":"2606.02725","citing_title":"Can current models predict the local black hole merger rate?","ref_index":272,"is_internal_anchor":true},{"citing_arxiv_id":"2605.19661","citing_title":"COSMOS-Web: Star formation along the early Hubble sequence and the evolution of dust over the redshift range 0