{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:XGR44CANYAWBAL6PUXFL73HR57","short_pith_number":"pith:XGR44CAN","canonical_record":{"source":{"id":"0912.0938","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-12-04T21:00:40Z","cross_cats_sorted":[],"title_canon_sha256":"f603388ebb1c1fd078ad349695ac00b6dbe40277bf35b048a662d3c83db378a4","abstract_canon_sha256":"9ba7ddc5357d813598214829adb65a8e2e28345cfe3a0c5952adff283c1a0a0f"},"schema_version":"1.0"},"canonical_sha256":"b9a3ce080dc02c102fcfa5cabfecf1efd4425b241b057425751642a33fa1f1ec","source":{"kind":"arxiv","id":"0912.0938","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0912.0938","created_at":"2026-05-18T02:10:26Z"},{"alias_kind":"arxiv_version","alias_value":"0912.0938v1","created_at":"2026-05-18T02:10:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.0938","created_at":"2026-05-18T02:10:26Z"},{"alias_kind":"pith_short_12","alias_value":"XGR44CANYAWB","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"XGR44CANYAWBAL6P","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"XGR44CAN","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:XGR44CANYAWBAL6PUXFL73HR57","target":"record","payload":{"canonical_record":{"source":{"id":"0912.0938","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-12-04T21:00:40Z","cross_cats_sorted":[],"title_canon_sha256":"f603388ebb1c1fd078ad349695ac00b6dbe40277bf35b048a662d3c83db378a4","abstract_canon_sha256":"9ba7ddc5357d813598214829adb65a8e2e28345cfe3a0c5952adff283c1a0a0f"},"schema_version":"1.0"},"canonical_sha256":"b9a3ce080dc02c102fcfa5cabfecf1efd4425b241b057425751642a33fa1f1ec","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:10:26.364056Z","signature_b64":"Zk2lNYp2eEj2SkuTVKx9BJ5NeuXirQDvm7+BoJer/y370b+n6X7NDTNuldhVRNB7l8D/oi3SKNXV63UccMMxCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b9a3ce080dc02c102fcfa5cabfecf1efd4425b241b057425751642a33fa1f1ec","last_reissued_at":"2026-05-18T02:10:26.363514Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:10:26.363514Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0912.0938","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:10:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PCwKE1SwDR1/5NlG9KVLBLf6csHiIdTM5RKX9H3cRCqThHLCtiTTw0j8muePyoc0Ndco9dOSi14O2ZHQWOphBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T02:29:02.040922Z"},"content_sha256":"ad63cbaf73f1feb6a4cd459ab9d7c8bfacbab3f2707e3e72e58a7893fb6f6b20","schema_version":"1.0","event_id":"sha256:ad63cbaf73f1feb6a4cd459ab9d7c8bfacbab3f2707e3e72e58a7893fb6f6b20"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:XGR44CANYAWBAL6PUXFL73HR57","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Implications of the remarkable homogeneity of galaxy groups and clusters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Michael L. Balogh, Sean L. McGee (University of Waterloo)","submitted_at":"2009-12-04T21:00:40Z","abstract_excerpt":"We measure the diversity of galaxy groups and clusters with mass M>1E13/h Msun, in terms of the star formation history of their galaxy populations, for the purpose of constraining the mass scale at which environmentally-important processes play a role in galaxy evolution. We consider three different group catalogues, selected in different ways, with photometry and spectroscopy from the Sloan Digital Sky Survey. For each system we measure the fraction of passively-evolving galaxies within R200 and brighter than either Mr=-18 (and with z<0.05) or Mr=-20 (and z<0.1). We use the (u-g) and (r-i) ga"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.0938","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:10:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Pr9QbsXRd4WCsCDKZADqbH4Gh/sHKWx7kiwMpUONQwZjda8TE5BqdNLZ+8MyPEGzJ4EoKZ0scITyMvjEwjhbAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T02:29:02.041271Z"},"content_sha256":"53fedbd5bbe254f0e1010f6b8f4c826925531952a2debfedd13bd64777debb09","schema_version":"1.0","event_id":"sha256:53fedbd5bbe254f0e1010f6b8f4c826925531952a2debfedd13bd64777debb09"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XGR44CANYAWBAL6PUXFL73HR57/bundle.json","state_url":"https://pith.science/pith/XGR44CANYAWBAL6PUXFL73HR57/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XGR44CANYAWBAL6PUXFL73HR57/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-31T02:29:02Z","links":{"resolver":"https://pith.science/pith/XGR44CANYAWBAL6PUXFL73HR57","bundle":"https://pith.science/pith/XGR44CANYAWBAL6PUXFL73HR57/bundle.json","state":"https://pith.science/pith/XGR44CANYAWBAL6PUXFL73HR57/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XGR44CANYAWBAL6PUXFL73HR57/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:XGR44CANYAWBAL6PUXFL73HR57","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"9ba7ddc5357d813598214829adb65a8e2e28345cfe3a0c5952adff283c1a0a0f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-12-04T21:00:40Z","title_canon_sha256":"f603388ebb1c1fd078ad349695ac00b6dbe40277bf35b048a662d3c83db378a4"},"schema_version":"1.0","source":{"id":"0912.0938","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0912.0938","created_at":"2026-05-18T02:10:26Z"},{"alias_kind":"arxiv_version","alias_value":"0912.0938v1","created_at":"2026-05-18T02:10:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.0938","created_at":"2026-05-18T02:10:26Z"},{"alias_kind":"pith_short_12","alias_value":"XGR44CANYAWB","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"XGR44CANYAWBAL6P","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"XGR44CAN","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:53fedbd5bbe254f0e1010f6b8f4c826925531952a2debfedd13bd64777debb09","target":"graph","created_at":"2026-05-18T02:10:26Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We measure the diversity of galaxy groups and clusters with mass M>1E13/h Msun, in terms of the star formation history of their galaxy populations, for the purpose of constraining the mass scale at which environmentally-important processes play a role in galaxy evolution. We consider three different group catalogues, selected in different ways, with photometry and spectroscopy from the Sloan Digital Sky Survey. For each system we measure the fraction of passively-evolving galaxies within R200 and brighter than either Mr=-18 (and with z<0.05) or Mr=-20 (and z<0.1). We use the (u-g) and (r-i) ga","authors_text":"Michael L. Balogh, Sean L. McGee (University of Waterloo)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-12-04T21:00:40Z","title":"Implications of the remarkable homogeneity of galaxy groups and clusters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.0938","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:ad63cbaf73f1feb6a4cd459ab9d7c8bfacbab3f2707e3e72e58a7893fb6f6b20","target":"record","created_at":"2026-05-18T02:10:26Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"9ba7ddc5357d813598214829adb65a8e2e28345cfe3a0c5952adff283c1a0a0f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-12-04T21:00:40Z","title_canon_sha256":"f603388ebb1c1fd078ad349695ac00b6dbe40277bf35b048a662d3c83db378a4"},"schema_version":"1.0","source":{"id":"0912.0938","kind":"arxiv","version":1}},"canonical_sha256":"b9a3ce080dc02c102fcfa5cabfecf1efd4425b241b057425751642a33fa1f1ec","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b9a3ce080dc02c102fcfa5cabfecf1efd4425b241b057425751642a33fa1f1ec","first_computed_at":"2026-05-18T02:10:26.363514Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:10:26.363514Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Zk2lNYp2eEj2SkuTVKx9BJ5NeuXirQDvm7+BoJer/y370b+n6X7NDTNuldhVRNB7l8D/oi3SKNXV63UccMMxCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:10:26.364056Z","signed_message":"canonical_sha256_bytes"},"source_id":"0912.0938","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ad63cbaf73f1feb6a4cd459ab9d7c8bfacbab3f2707e3e72e58a7893fb6f6b20","sha256:53fedbd5bbe254f0e1010f6b8f4c826925531952a2debfedd13bd64777debb09"],"state_sha256":"b1c6e77d9a13dcbb309ca9b4936e913c86c994e9d26c47b5466d3130c32965f0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/pH3QuYZQ3aProc1qfp/mORvw5QXoqfMg2MWR45ExpftTDHfuCdMHzqPJ3JP0aA1hoHT8tO58pU+GK1vt7CVDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T02:29:02.043342Z","bundle_sha256":"0cbcac0da0cd5408c2cbebb591faab011b74fb7bdb31c0b5f88bdebdb6b2c8c5"}}