{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:P2CKTBSOPLQQXMIU4QHFO7CELJ","short_pith_number":"pith:P2CKTBSO","schema_version":"1.0","canonical_sha256":"7e84a9864e7ae10bb114e40e577c445a41e6183ecac83930a04971bfbe30f6d1","source":{"kind":"arxiv","id":"0911.3825","version":1},"attestation_state":"computed","paper":{"title":"Intrinsic colors and ages of extremely red elliptical galaxies at high redshift","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Martin Lopez-Corredoira","submitted_at":"2009-11-19T15:55:29Z","abstract_excerpt":"In order to know the formation epoch of the oldest elliptical galaxies as a function of mass and observed redshift, a statistical analysis for 333 extremely red objects (EROs) classified as old galaxies (OGs) at 0.8<z<2.3 is carried out. Once we get M_V and (B-V) at rest for each galaxy, we calculate the average variation of this intrinsic color with redshift and derive the average age through a synthesis model (the code for the calculation of the age has been made publicly available). The average gradient of the (B-V) color at rest of EROs/OGs is 0.07-0.10 Gyr^{-1} for a fixed luminosity. The"},"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":"0911.3825","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-19T15:55:29Z","cross_cats_sorted":[],"title_canon_sha256":"fff0c7cf2eef90a7bf0c420d700179ad7d81db0c313f8a0c6a32abc10b005afb","abstract_canon_sha256":"273d19f81fa8bf7af348aa26f593aec8f116108fc3f08377cefcff7c6d64227c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:10:45.821583Z","signature_b64":"ChHoRtwGioxaPqhPpjOaoH84dYx3L3ewZ2qY9mwk7EoaFNZyk7W6TixqaOjJsu3isRBiS27BX3gZ72FjBzClBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7e84a9864e7ae10bb114e40e577c445a41e6183ecac83930a04971bfbe30f6d1","last_reissued_at":"2026-05-18T02:10:45.820930Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:10:45.820930Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Intrinsic colors and ages of extremely red elliptical galaxies at high redshift","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Martin Lopez-Corredoira","submitted_at":"2009-11-19T15:55:29Z","abstract_excerpt":"In order to know the formation epoch of the oldest elliptical galaxies as a function of mass and observed redshift, a statistical analysis for 333 extremely red objects (EROs) classified as old galaxies (OGs) at 0.8<z<2.3 is carried out. Once we get M_V and (B-V) at rest for each galaxy, we calculate the average variation of this intrinsic color with redshift and derive the average age through a synthesis model (the code for the calculation of the age has been made publicly available). The average gradient of the (B-V) color at rest of EROs/OGs is 0.07-0.10 Gyr^{-1} for a fixed luminosity. The"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.3825","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":"0911.3825","created_at":"2026-05-18T02:10:45.821021+00:00"},{"alias_kind":"arxiv_version","alias_value":"0911.3825v1","created_at":"2026-05-18T02:10:45.821021+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.3825","created_at":"2026-05-18T02:10:45.821021+00:00"},{"alias_kind":"pith_short_12","alias_value":"P2CKTBSOPLQQ","created_at":"2026-05-18T12:26:01.383474+00:00"},{"alias_kind":"pith_short_16","alias_value":"P2CKTBSOPLQQXMIU","created_at":"2026-05-18T12:26:01.383474+00:00"},{"alias_kind":"pith_short_8","alias_value":"P2CKTBSO","created_at":"2026-05-18T12:26:01.383474+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/P2CKTBSOPLQQXMIU4QHFO7CELJ","json":"https://pith.science/pith/P2CKTBSOPLQQXMIU4QHFO7CELJ.json","graph_json":"https://pith.science/api/pith-number/P2CKTBSOPLQQXMIU4QHFO7CELJ/graph.json","events_json":"https://pith.science/api/pith-number/P2CKTBSOPLQQXMIU4QHFO7CELJ/events.json","paper":"https://pith.science/paper/P2CKTBSO"},"agent_actions":{"view_html":"https://pith.science/pith/P2CKTBSOPLQQXMIU4QHFO7CELJ","download_json":"https://pith.science/pith/P2CKTBSOPLQQXMIU4QHFO7CELJ.json","view_paper":"https://pith.science/paper/P2CKTBSO","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0911.3825&json=true","fetch_graph":"https://pith.science/api/pith-number/P2CKTBSOPLQQXMIU4QHFO7CELJ/graph.json","fetch_events":"https://pith.science/api/pith-number/P2CKTBSOPLQQXMIU4QHFO7CELJ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/P2CKTBSOPLQQXMIU4QHFO7CELJ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/P2CKTBSOPLQQXMIU4QHFO7CELJ/action/storage_attestation","attest_author":"https://pith.science/pith/P2CKTBSOPLQQXMIU4QHFO7CELJ/action/author_attestation","sign_citation":"https://pith.science/pith/P2CKTBSOPLQQXMIU4QHFO7CELJ/action/citation_signature","submit_replication":"https://pith.science/pith/P2CKTBSOPLQQXMIU4QHFO7CELJ/action/replication_record"}},"created_at":"2026-05-18T02:10:45.821021+00:00","updated_at":"2026-05-18T02:10:45.821021+00:00"}