{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2000:I67IRNBQHUYI5DWFPFOBKS5SFE","short_pith_number":"pith:I67IRNBQ","schema_version":"1.0","canonical_sha256":"47be88b4303d308e8ec5795c154bb2290c2784df42463ed2b20463d20a1e86db","source":{"kind":"arxiv","id":"astro-ph/0004091","version":1},"attestation_state":"computed","paper":{"title":"CFHT Optical PDCS Survey II: Evolution in the Space Density of Clusters of Galaxies","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. K. Romer, A. Mazure, B. P. Holden, C. Adami, F. J. Castander, L. M. Lubin, M. Postman, M. P. Ulmer, R. C. Nichol","submitted_at":"2000-04-06T19:07:20Z","abstract_excerpt":"We present the first dynamical study of the optically selected Palomar Distant Cluster Survey (PDCS). We show that eleven out of twelve PDCS clusters we observed are real over-densities of galaxies. Most clusters have velocity dispersions appropriate for clusters of galaxies. However, we find a fraction (1/3) of objects in the PDCS which have velocity dispersions in the range of groups of galaxies (200 +/- 100 km/s) but have richnesses appropriate for clusters of galaxies.\n  We measure the richness function, X-ray luminosity function (using both the detections and upper limits), and the mass f"},"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/0004091","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2000-04-06T19:07:20Z","cross_cats_sorted":[],"title_canon_sha256":"5e1e4adc51c83d0a81c80ea7d8bb1b8b18885e933927325c9083da97f61dc0bc","abstract_canon_sha256":"0e7e45a5fa303ef6ba11ffa664b25427ccdb38d10666bb380a3ceb3e688f7c8b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:16:16.145848Z","signature_b64":"Ys9Z7qS/uymlabnWruhjXHemfFYh2l+67ZdD+SG3CSRwVNKhc0qNJT87DIK3xr94Q43yoxiXJxTR6XARjERoBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"47be88b4303d308e8ec5795c154bb2290c2784df42463ed2b20463d20a1e86db","last_reissued_at":"2026-07-04T16:16:16.145423Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:16:16.145423Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"CFHT Optical PDCS Survey II: Evolution in the Space Density of Clusters of Galaxies","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. K. Romer, A. Mazure, B. P. Holden, C. Adami, F. J. Castander, L. M. Lubin, M. Postman, M. P. Ulmer, R. C. Nichol","submitted_at":"2000-04-06T19:07:20Z","abstract_excerpt":"We present the first dynamical study of the optically selected Palomar Distant Cluster Survey (PDCS). We show that eleven out of twelve PDCS clusters we observed are real over-densities of galaxies. Most clusters have velocity dispersions appropriate for clusters of galaxies. However, we find a fraction (1/3) of objects in the PDCS which have velocity dispersions in the range of groups of galaxies (200 +/- 100 km/s) but have richnesses appropriate for clusters of galaxies.\n  We measure the richness function, X-ray luminosity function (using both the detections and upper limits), and the mass f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0004091","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/0004091/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/0004091","created_at":"2026-07-04T16:16:16.145478+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0004091v1","created_at":"2026-07-04T16:16:16.145478+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0004091","created_at":"2026-07-04T16:16:16.145478+00:00"},{"alias_kind":"pith_short_12","alias_value":"I67IRNBQHUYI","created_at":"2026-07-04T16:16:16.145478+00:00"},{"alias_kind":"pith_short_16","alias_value":"I67IRNBQHUYI5DWF","created_at":"2026-07-04T16:16:16.145478+00:00"},{"alias_kind":"pith_short_8","alias_value":"I67IRNBQ","created_at":"2026-07-04T16:16:16.145478+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/I67IRNBQHUYI5DWFPFOBKS5SFE","json":"https://pith.science/pith/I67IRNBQHUYI5DWFPFOBKS5SFE.json","graph_json":"https://pith.science/api/pith-number/I67IRNBQHUYI5DWFPFOBKS5SFE/graph.json","events_json":"https://pith.science/api/pith-number/I67IRNBQHUYI5DWFPFOBKS5SFE/events.json","paper":"https://pith.science/paper/I67IRNBQ"},"agent_actions":{"view_html":"https://pith.science/pith/I67IRNBQHUYI5DWFPFOBKS5SFE","download_json":"https://pith.science/pith/I67IRNBQHUYI5DWFPFOBKS5SFE.json","view_paper":"https://pith.science/paper/I67IRNBQ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0004091&json=true","fetch_graph":"https://pith.science/api/pith-number/I67IRNBQHUYI5DWFPFOBKS5SFE/graph.json","fetch_events":"https://pith.science/api/pith-number/I67IRNBQHUYI5DWFPFOBKS5SFE/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/I67IRNBQHUYI5DWFPFOBKS5SFE/action/timestamp_anchor","attest_storage":"https://pith.science/pith/I67IRNBQHUYI5DWFPFOBKS5SFE/action/storage_attestation","attest_author":"https://pith.science/pith/I67IRNBQHUYI5DWFPFOBKS5SFE/action/author_attestation","sign_citation":"https://pith.science/pith/I67IRNBQHUYI5DWFPFOBKS5SFE/action/citation_signature","submit_replication":"https://pith.science/pith/I67IRNBQHUYI5DWFPFOBKS5SFE/action/replication_record"}},"created_at":"2026-07-04T16:16:16.145478+00:00","updated_at":"2026-07-04T16:16:16.145478+00:00"}