{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:6SOPUE4T7I54BCWAZ26S7WYVWS","short_pith_number":"pith:6SOPUE4T","schema_version":"1.0","canonical_sha256":"f49cfa1393fa3bc08ac0cebd2fdb15b48ec78c6ba4a40a111d37fdf86dfc62d4","source":{"kind":"arxiv","id":"1908.01666","version":1},"attestation_state":"computed","paper":{"title":"A young galaxy cluster in the old Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Chia-Ying Chiang, Chien-Chang Ho, Rieko Momose, Ryu Makiya, Seong Jin Kim, Tetsuya Hashimoto, Tomotsugu Goto","submitted_at":"2019-08-05T14:56:44Z","abstract_excerpt":"Galaxies evolve from a blue star-forming phase into a red quiescent one by quenching their star formation activity. In high density environments, this galaxy evolution proceeds earlier and more efficiently. Therefore, local galaxy clusters are dominated by well-evolved red, elliptical galaxies. The fraction of blue galaxies in clusters monotonically declines with decreasing redshift, i.e., the Butcher-Oemler effect. In the local Universe, observed blue fractions of massive clusters are as small as $\\lesssim$ 0.2. Here we report a discovery of a \\lq \\lq blue cluster\\rq \\rq, that is a local gala"},"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":"1908.01666","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-08-05T14:56:44Z","cross_cats_sorted":[],"title_canon_sha256":"2155c61c145f2671882e9781f3f6827693eada349a9b7a49af382b28927a1ce7","abstract_canon_sha256":"88cb268747a57dfca115c283eeb596b156bce5c013d1c257cc0c06d31eed0583"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:58:28.507764Z","signature_b64":"T610jJyJ29Esdb6N1Qz+q7S9fJng4KdKdRpbyyJ7PlH6QFzp1WhH5cx+qThrTnrLeISCIXV16lE/5bsZWu3CDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f49cfa1393fa3bc08ac0cebd2fdb15b48ec78c6ba4a40a111d37fdf86dfc62d4","last_reissued_at":"2026-07-04T23:58:28.507395Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:58:28.507395Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A young galaxy cluster in the old Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Chia-Ying Chiang, Chien-Chang Ho, Rieko Momose, Ryu Makiya, Seong Jin Kim, Tetsuya Hashimoto, Tomotsugu Goto","submitted_at":"2019-08-05T14:56:44Z","abstract_excerpt":"Galaxies evolve from a blue star-forming phase into a red quiescent one by quenching their star formation activity. In high density environments, this galaxy evolution proceeds earlier and more efficiently. Therefore, local galaxy clusters are dominated by well-evolved red, elliptical galaxies. The fraction of blue galaxies in clusters monotonically declines with decreasing redshift, i.e., the Butcher-Oemler effect. In the local Universe, observed blue fractions of massive clusters are as small as $\\lesssim$ 0.2. Here we report a discovery of a \\lq \\lq blue cluster\\rq \\rq, that is a local gala"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.01666","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/1908.01666/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":"1908.01666","created_at":"2026-07-04T23:58:28.507453+00:00"},{"alias_kind":"arxiv_version","alias_value":"1908.01666v1","created_at":"2026-07-04T23:58:28.507453+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.01666","created_at":"2026-07-04T23:58:28.507453+00:00"},{"alias_kind":"pith_short_12","alias_value":"6SOPUE4T7I54","created_at":"2026-07-04T23:58:28.507453+00:00"},{"alias_kind":"pith_short_16","alias_value":"6SOPUE4T7I54BCWA","created_at":"2026-07-04T23:58:28.507453+00:00"},{"alias_kind":"pith_short_8","alias_value":"6SOPUE4T","created_at":"2026-07-04T23:58:28.507453+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/6SOPUE4T7I54BCWAZ26S7WYVWS","json":"https://pith.science/pith/6SOPUE4T7I54BCWAZ26S7WYVWS.json","graph_json":"https://pith.science/api/pith-number/6SOPUE4T7I54BCWAZ26S7WYVWS/graph.json","events_json":"https://pith.science/api/pith-number/6SOPUE4T7I54BCWAZ26S7WYVWS/events.json","paper":"https://pith.science/paper/6SOPUE4T"},"agent_actions":{"view_html":"https://pith.science/pith/6SOPUE4T7I54BCWAZ26S7WYVWS","download_json":"https://pith.science/pith/6SOPUE4T7I54BCWAZ26S7WYVWS.json","view_paper":"https://pith.science/paper/6SOPUE4T","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1908.01666&json=true","fetch_graph":"https://pith.science/api/pith-number/6SOPUE4T7I54BCWAZ26S7WYVWS/graph.json","fetch_events":"https://pith.science/api/pith-number/6SOPUE4T7I54BCWAZ26S7WYVWS/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/6SOPUE4T7I54BCWAZ26S7WYVWS/action/timestamp_anchor","attest_storage":"https://pith.science/pith/6SOPUE4T7I54BCWAZ26S7WYVWS/action/storage_attestation","attest_author":"https://pith.science/pith/6SOPUE4T7I54BCWAZ26S7WYVWS/action/author_attestation","sign_citation":"https://pith.science/pith/6SOPUE4T7I54BCWAZ26S7WYVWS/action/citation_signature","submit_replication":"https://pith.science/pith/6SOPUE4T7I54BCWAZ26S7WYVWS/action/replication_record"}},"created_at":"2026-07-04T23:58:28.507453+00:00","updated_at":"2026-07-04T23:58:28.507453+00:00"}