{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2012:FAQXQSJXJDNX4QNMQXNTD5LVPU","short_pith_number":"pith:FAQXQSJX","schema_version":"1.0","canonical_sha256":"282178493748db7e41ac85db31f5757d14bbff41fc89b61ea41dc3725ea1872f","source":{"kind":"arxiv","id":"1201.2411","version":1},"attestation_state":"computed","paper":{"title":"Population Gradients in the SDSS Galaxy Catalog. The role of merging","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"C. Tortora, N. R. Napolitano","submitted_at":"2012-01-11T21:00:04Z","abstract_excerpt":"We investigate the role of the environment on the colour and stellar population gradients in a local sample of ~3500 central and ~1150 satellite SDSS early-type galaxies (ETGs). The environment is parameterized in terms of the number of satellite galaxies, N_gal in each group. For central galaxies, we find that both optical colour and mass-to-light (M/L) ratio gradients are shallower in central galaxies residing in denser environments (higher N_gal). This trend is driven by metallicity gradients, while age gradients appear to be less dependent on the environment and to have a larger scatter. O"},"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":"1201.2411","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-01-11T21:00:04Z","cross_cats_sorted":[],"title_canon_sha256":"2e19b2eccc96bb44822d1997bac191eeed300546ff26d38373a7dc171c22c20a","abstract_canon_sha256":"db023057ac8dbc6bdb1cb47c73d96e100bd2b30d6cafe8dd405cc91548722bc1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:52.555890Z","signature_b64":"gvdQZ6bsY79irDFsCBnceBtVuRE5RPH5S4FI+ZJTaq3Xnj6xTdimXjDqIK4idMXVgqoDtdzicusrbBpRIFXvDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"282178493748db7e41ac85db31f5757d14bbff41fc89b61ea41dc3725ea1872f","last_reissued_at":"2026-05-18T01:58:52.555117Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:52.555117Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Population Gradients in the SDSS Galaxy Catalog. The role of merging","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"C. Tortora, N. R. Napolitano","submitted_at":"2012-01-11T21:00:04Z","abstract_excerpt":"We investigate the role of the environment on the colour and stellar population gradients in a local sample of ~3500 central and ~1150 satellite SDSS early-type galaxies (ETGs). The environment is parameterized in terms of the number of satellite galaxies, N_gal in each group. For central galaxies, we find that both optical colour and mass-to-light (M/L) ratio gradients are shallower in central galaxies residing in denser environments (higher N_gal). This trend is driven by metallicity gradients, while age gradients appear to be less dependent on the environment and to have a larger scatter. O"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.2411","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":"1201.2411","created_at":"2026-05-18T01:58:52.555241+00:00"},{"alias_kind":"arxiv_version","alias_value":"1201.2411v1","created_at":"2026-05-18T01:58:52.555241+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.2411","created_at":"2026-05-18T01:58:52.555241+00:00"},{"alias_kind":"pith_short_12","alias_value":"FAQXQSJXJDNX","created_at":"2026-05-18T12:27:04.183437+00:00"},{"alias_kind":"pith_short_16","alias_value":"FAQXQSJXJDNX4QNM","created_at":"2026-05-18T12:27:04.183437+00:00"},{"alias_kind":"pith_short_8","alias_value":"FAQXQSJX","created_at":"2026-05-18T12:27:04.183437+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/FAQXQSJXJDNX4QNMQXNTD5LVPU","json":"https://pith.science/pith/FAQXQSJXJDNX4QNMQXNTD5LVPU.json","graph_json":"https://pith.science/api/pith-number/FAQXQSJXJDNX4QNMQXNTD5LVPU/graph.json","events_json":"https://pith.science/api/pith-number/FAQXQSJXJDNX4QNMQXNTD5LVPU/events.json","paper":"https://pith.science/paper/FAQXQSJX"},"agent_actions":{"view_html":"https://pith.science/pith/FAQXQSJXJDNX4QNMQXNTD5LVPU","download_json":"https://pith.science/pith/FAQXQSJXJDNX4QNMQXNTD5LVPU.json","view_paper":"https://pith.science/paper/FAQXQSJX","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1201.2411&json=true","fetch_graph":"https://pith.science/api/pith-number/FAQXQSJXJDNX4QNMQXNTD5LVPU/graph.json","fetch_events":"https://pith.science/api/pith-number/FAQXQSJXJDNX4QNMQXNTD5LVPU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/FAQXQSJXJDNX4QNMQXNTD5LVPU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/FAQXQSJXJDNX4QNMQXNTD5LVPU/action/storage_attestation","attest_author":"https://pith.science/pith/FAQXQSJXJDNX4QNMQXNTD5LVPU/action/author_attestation","sign_citation":"https://pith.science/pith/FAQXQSJXJDNX4QNMQXNTD5LVPU/action/citation_signature","submit_replication":"https://pith.science/pith/FAQXQSJXJDNX4QNMQXNTD5LVPU/action/replication_record"}},"created_at":"2026-05-18T01:58:52.555241+00:00","updated_at":"2026-05-18T01:58:52.555241+00:00"}