{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:C34E7DAAPAA56DGQHAY4ACSD2Z","short_pith_number":"pith:C34E7DAA","schema_version":"1.0","canonical_sha256":"16f84f8c007801df0cd03831c00a43d660cb16317c1f481eabcfddb6e5965ba6","source":{"kind":"arxiv","id":"0909.3522","version":1},"attestation_state":"computed","paper":{"title":"Star formation and AGN activity in SDSS cluster galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Anja von der Linden (KIPAC/Stanford; MPA), Guinevere Kauffmann (MPA), Simon D. M. White (MPA), Simone Weinmann (MPA), Vivienne Wild (IAP; MPA)","submitted_at":"2009-09-18T20:31:24Z","abstract_excerpt":"We investigate the recent and current star formation activity of galaxies as function of distance from the cluster center in a sample of 521 SDSS clusters at z<0.1. We show that when the BCGs are excluded from the galaxy sample, there is no evidence for mass segregation in the clusters, so that differences in cluster and field populations cannot simply be attributed to different mass functions. We find a marked star formation-radius relation in that almost all galaxies in the cluster core are quiescent, i.e. have terminated star formation a few Gyr ago. This star formation-radius relation is m"},"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":"0909.3522","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-18T20:31:24Z","cross_cats_sorted":[],"title_canon_sha256":"f97cf998a876062999ebbe3bb29036e7401a3d990ab4afbe31433e5e55fb1520","abstract_canon_sha256":"fe8997d84e68c7c9a77835d083d235ab2cb26d51344a90b25288946851c18fe9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:11:46.301414Z","signature_b64":"1XcLsQWGW4BDZjVNd3SVFE2jBkaJjhHNRykvLK3HlZ4Iw0hZl70hRjfHmXQC7qJ3yQUdqQh//j8WLQMJp2u0Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"16f84f8c007801df0cd03831c00a43d660cb16317c1f481eabcfddb6e5965ba6","last_reissued_at":"2026-05-18T02:11:46.300726Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:11:46.300726Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Star formation and AGN activity in SDSS cluster galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Anja von der Linden (KIPAC/Stanford; MPA), Guinevere Kauffmann (MPA), Simon D. M. White (MPA), Simone Weinmann (MPA), Vivienne Wild (IAP; MPA)","submitted_at":"2009-09-18T20:31:24Z","abstract_excerpt":"We investigate the recent and current star formation activity of galaxies as function of distance from the cluster center in a sample of 521 SDSS clusters at z<0.1. We show that when the BCGs are excluded from the galaxy sample, there is no evidence for mass segregation in the clusters, so that differences in cluster and field populations cannot simply be attributed to different mass functions. We find a marked star formation-radius relation in that almost all galaxies in the cluster core are quiescent, i.e. have terminated star formation a few Gyr ago. This star formation-radius relation is m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.3522","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":"0909.3522","created_at":"2026-05-18T02:11:46.300830+00:00"},{"alias_kind":"arxiv_version","alias_value":"0909.3522v1","created_at":"2026-05-18T02:11:46.300830+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.3522","created_at":"2026-05-18T02:11:46.300830+00:00"},{"alias_kind":"pith_short_12","alias_value":"C34E7DAAPAA5","created_at":"2026-05-18T12:25:58.837520+00:00"},{"alias_kind":"pith_short_16","alias_value":"C34E7DAAPAA56DGQ","created_at":"2026-05-18T12:25:58.837520+00:00"},{"alias_kind":"pith_short_8","alias_value":"C34E7DAA","created_at":"2026-05-18T12:25:58.837520+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/C34E7DAAPAA56DGQHAY4ACSD2Z","json":"https://pith.science/pith/C34E7DAAPAA56DGQHAY4ACSD2Z.json","graph_json":"https://pith.science/api/pith-number/C34E7DAAPAA56DGQHAY4ACSD2Z/graph.json","events_json":"https://pith.science/api/pith-number/C34E7DAAPAA56DGQHAY4ACSD2Z/events.json","paper":"https://pith.science/paper/C34E7DAA"},"agent_actions":{"view_html":"https://pith.science/pith/C34E7DAAPAA56DGQHAY4ACSD2Z","download_json":"https://pith.science/pith/C34E7DAAPAA56DGQHAY4ACSD2Z.json","view_paper":"https://pith.science/paper/C34E7DAA","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0909.3522&json=true","fetch_graph":"https://pith.science/api/pith-number/C34E7DAAPAA56DGQHAY4ACSD2Z/graph.json","fetch_events":"https://pith.science/api/pith-number/C34E7DAAPAA56DGQHAY4ACSD2Z/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/C34E7DAAPAA56DGQHAY4ACSD2Z/action/timestamp_anchor","attest_storage":"https://pith.science/pith/C34E7DAAPAA56DGQHAY4ACSD2Z/action/storage_attestation","attest_author":"https://pith.science/pith/C34E7DAAPAA56DGQHAY4ACSD2Z/action/author_attestation","sign_citation":"https://pith.science/pith/C34E7DAAPAA56DGQHAY4ACSD2Z/action/citation_signature","submit_replication":"https://pith.science/pith/C34E7DAAPAA56DGQHAY4ACSD2Z/action/replication_record"}},"created_at":"2026-05-18T02:11:46.300830+00:00","updated_at":"2026-05-18T02:11:46.300830+00:00"}