{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:RCT4LHPGVWX322VSZQQ4XWYKDH","short_pith_number":"pith:RCT4LHPG","canonical_record":{"source":{"id":"1601.01117","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-01-06T09:38:49Z","cross_cats_sorted":[],"title_canon_sha256":"c9104592fd3e789c05c5bd835a29c3b94f5155c7b9b2b6f52af22f2d1fc94469","abstract_canon_sha256":"af03849c9cf9c3f33a826cc8e2fa1e0dcf023ce54b4cfeee6099ffa369c507a6"},"schema_version":"1.0"},"canonical_sha256":"88a7c59de6adafbd6ab2cc21cbdb0a19c228ade6fc6851325ee4fe825cc28774","source":{"kind":"arxiv","id":"1601.01117","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.01117","created_at":"2026-05-18T01:19:01Z"},{"alias_kind":"arxiv_version","alias_value":"1601.01117v2","created_at":"2026-05-18T01:19:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.01117","created_at":"2026-05-18T01:19:01Z"},{"alias_kind":"pith_short_12","alias_value":"RCT4LHPGVWX3","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_16","alias_value":"RCT4LHPGVWX322VS","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_8","alias_value":"RCT4LHPG","created_at":"2026-05-18T12:30:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:RCT4LHPGVWX322VSZQQ4XWYKDH","target":"record","payload":{"canonical_record":{"source":{"id":"1601.01117","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-01-06T09:38:49Z","cross_cats_sorted":[],"title_canon_sha256":"c9104592fd3e789c05c5bd835a29c3b94f5155c7b9b2b6f52af22f2d1fc94469","abstract_canon_sha256":"af03849c9cf9c3f33a826cc8e2fa1e0dcf023ce54b4cfeee6099ffa369c507a6"},"schema_version":"1.0"},"canonical_sha256":"88a7c59de6adafbd6ab2cc21cbdb0a19c228ade6fc6851325ee4fe825cc28774","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:19:01.473553Z","signature_b64":"Mao2bp2CtnC9SlQE4fkGS25MNfyNv1EXPpiKA0rQErQ7l9M6aHtbdb66oNEKRJgOlZjhrTA6iczrIFXHpf5TAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"88a7c59de6adafbd6ab2cc21cbdb0a19c228ade6fc6851325ee4fe825cc28774","last_reissued_at":"2026-05-18T01:19:01.473163Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:19:01.473163Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1601.01117","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:19:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u2ntf24K0H6E8c1Zv5eBfde1CY1CKABvLc5RhZSrFSQSAUNmCO0F6SawUFtuc2wmgTym6kqdnV7ZY43pijeSAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T12:38:06.898329Z"},"content_sha256":"511aeeafb2a8350135f8f67dd55310a31e29acb584f21a5145230803830d0ff1","schema_version":"1.0","event_id":"sha256:511aeeafb2a8350135f8f67dd55310a31e29acb584f21a5145230803830d0ff1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:RCT4LHPGVWX322VSZQQ4XWYKDH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Friends-of-friends galaxy group finder with membership refinement. Application to the local Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. Tamm, E. Tempel, M. Einasto, M. Gramann, R. Kipper, T. Sepp, T. Tuvikene","submitted_at":"2016-01-06T09:38:49Z","abstract_excerpt":"Context. Groups form the most abundant class of galaxy systems. They act as the principal drivers of galaxy evolution and can be used as tracers of the large-scale structure and the underlying cosmology. However, the detection of galaxy groups from galaxy redshift survey data is hampered by several observational limitations.\n  Aims. We improve the widely used friends-of-friends (FoF) group finding algorithm with membership refinement procedures and apply the method to a combined dataset of galaxies in the local Universe. A major aim of the refinement is to detect subgroups within the FoF group"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.01117","kind":"arxiv","version":2},"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":"2026-05-18T01:19:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vJb6Rsdt666et+U7Egk165MScrgnwuzqk2wAF8AKQ4QsM2VsV91BlayaHMJIUTWfO2VTs05El6oJtTDkkJwmAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T12:38:06.898688Z"},"content_sha256":"bbf45800a02672800967734dabbef37ba81ce3a85802d44934bac7c96f05e242","schema_version":"1.0","event_id":"sha256:bbf45800a02672800967734dabbef37ba81ce3a85802d44934bac7c96f05e242"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RCT4LHPGVWX322VSZQQ4XWYKDH/bundle.json","state_url":"https://pith.science/pith/RCT4LHPGVWX322VSZQQ4XWYKDH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RCT4LHPGVWX322VSZQQ4XWYKDH/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":"2026-06-01T12:38:06Z","links":{"resolver":"https://pith.science/pith/RCT4LHPGVWX322VSZQQ4XWYKDH","bundle":"https://pith.science/pith/RCT4LHPGVWX322VSZQQ4XWYKDH/bundle.json","state":"https://pith.science/pith/RCT4LHPGVWX322VSZQQ4XWYKDH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RCT4LHPGVWX322VSZQQ4XWYKDH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:RCT4LHPGVWX322VSZQQ4XWYKDH","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":"af03849c9cf9c3f33a826cc8e2fa1e0dcf023ce54b4cfeee6099ffa369c507a6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-01-06T09:38:49Z","title_canon_sha256":"c9104592fd3e789c05c5bd835a29c3b94f5155c7b9b2b6f52af22f2d1fc94469"},"schema_version":"1.0","source":{"id":"1601.01117","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.01117","created_at":"2026-05-18T01:19:01Z"},{"alias_kind":"arxiv_version","alias_value":"1601.01117v2","created_at":"2026-05-18T01:19:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.01117","created_at":"2026-05-18T01:19:01Z"},{"alias_kind":"pith_short_12","alias_value":"RCT4LHPGVWX3","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_16","alias_value":"RCT4LHPGVWX322VS","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_8","alias_value":"RCT4LHPG","created_at":"2026-05-18T12:30:41Z"}],"graph_snapshots":[{"event_id":"sha256:bbf45800a02672800967734dabbef37ba81ce3a85802d44934bac7c96f05e242","target":"graph","created_at":"2026-05-18T01:19:01Z","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":"Context. Groups form the most abundant class of galaxy systems. They act as the principal drivers of galaxy evolution and can be used as tracers of the large-scale structure and the underlying cosmology. However, the detection of galaxy groups from galaxy redshift survey data is hampered by several observational limitations.\n  Aims. We improve the widely used friends-of-friends (FoF) group finding algorithm with membership refinement procedures and apply the method to a combined dataset of galaxies in the local Universe. A major aim of the refinement is to detect subgroups within the FoF group","authors_text":"A. Tamm, E. Tempel, M. Einasto, M. Gramann, R. Kipper, T. Sepp, T. Tuvikene","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-01-06T09:38:49Z","title":"Friends-of-friends galaxy group finder with membership refinement. Application to the local Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.01117","kind":"arxiv","version":2},"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":"sha256:511aeeafb2a8350135f8f67dd55310a31e29acb584f21a5145230803830d0ff1","target":"record","created_at":"2026-05-18T01:19:01Z","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":"af03849c9cf9c3f33a826cc8e2fa1e0dcf023ce54b4cfeee6099ffa369c507a6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2016-01-06T09:38:49Z","title_canon_sha256":"c9104592fd3e789c05c5bd835a29c3b94f5155c7b9b2b6f52af22f2d1fc94469"},"schema_version":"1.0","source":{"id":"1601.01117","kind":"arxiv","version":2}},"canonical_sha256":"88a7c59de6adafbd6ab2cc21cbdb0a19c228ade6fc6851325ee4fe825cc28774","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"88a7c59de6adafbd6ab2cc21cbdb0a19c228ade6fc6851325ee4fe825cc28774","first_computed_at":"2026-05-18T01:19:01.473163Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:19:01.473163Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Mao2bp2CtnC9SlQE4fkGS25MNfyNv1EXPpiKA0rQErQ7l9M6aHtbdb66oNEKRJgOlZjhrTA6iczrIFXHpf5TAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:19:01.473553Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.01117","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:511aeeafb2a8350135f8f67dd55310a31e29acb584f21a5145230803830d0ff1","sha256:bbf45800a02672800967734dabbef37ba81ce3a85802d44934bac7c96f05e242"],"state_sha256":"af2ca09789155b77dbeb65d4663476b89ab5f631e807cd24337ab40dd98194ed"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BZEHM6aGcTslny6KU2P4uwEGQumHw604AFObK1+XgK8MsoM/91XJ/RBDnREl6GKqEPgWOwf08b4wXkx7RHkBAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T12:38:06.900671Z","bundle_sha256":"83d14b5d2b755a0afe4e3595a08e8b2238f7aab06b14d7ac29317933969516eb"}}