{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:QXO7YUZ3LII7YUAJXGZ6B3JWSX","short_pith_number":"pith:QXO7YUZ3","canonical_record":{"source":{"id":"0906.4489","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-24T15:04:13Z","cross_cats_sorted":[],"title_canon_sha256":"18cf663c3893d97260fa0ca4e9beae080ca4a5d71401293e6ec93e318c05eeca","abstract_canon_sha256":"c1923e6bb3e215ba1be7bea405921ee1fa17493580f06608fef7606ea1960f88"},"schema_version":"1.0"},"canonical_sha256":"85ddfc533b5a11fc5009b9b3e0ed3695c61c463a61582627e70c344e732d3ee2","source":{"kind":"arxiv","id":"0906.4489","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.4489","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"arxiv_version","alias_value":"0906.4489v1","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.4489","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"pith_short_12","alias_value":"QXO7YUZ3LII7","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"QXO7YUZ3LII7YUAJ","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"QXO7YUZ3","created_at":"2026-05-18T12:26:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:QXO7YUZ3LII7YUAJXGZ6B3JWSX","target":"record","payload":{"canonical_record":{"source":{"id":"0906.4489","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-24T15:04:13Z","cross_cats_sorted":[],"title_canon_sha256":"18cf663c3893d97260fa0ca4e9beae080ca4a5d71401293e6ec93e318c05eeca","abstract_canon_sha256":"c1923e6bb3e215ba1be7bea405921ee1fa17493580f06608fef7606ea1960f88"},"schema_version":"1.0"},"canonical_sha256":"85ddfc533b5a11fc5009b9b3e0ed3695c61c463a61582627e70c344e732d3ee2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:48:21.433014Z","signature_b64":"Nf5BEKD1zHC0eiPUPwj1w/UI/rnJg8nP3iy7tjzY+mkBbxW7QIozwRfH4ZZEU6z/Az3rNhw5UHrGzj5sKu8HDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"85ddfc533b5a11fc5009b9b3e0ed3695c61c463a61582627e70c344e732d3ee2","last_reissued_at":"2026-05-18T00:48:21.432340Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:48:21.432340Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0906.4489","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":"2026-05-18T00:48:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XPxFQguhK6lPtY5A4dpv6tpHLah2ttcn/+e0IAE8RYkoc6u8J+dxz7+Hk9YlSdMLfjf7TzpdhMKh12P3akwKCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:00:20.735931Z"},"content_sha256":"7d6225174e960661249b73416f924b7b6deda7a5bb385dfcb3edf084c5fc2a07","schema_version":"1.0","event_id":"sha256:7d6225174e960661249b73416f924b7b6deda7a5bb385dfcb3edf084c5fc2a07"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:QXO7YUZ3LII7YUAJXGZ6B3JWSX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Witnessing the assembly at z=1.6 of a galaxy cluster (GMASS ultradeep spectroscopy of galaxies at z~2 - V)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. Cimatti, A. Franceschini, A. Renzini, C. Halliday, E. Daddi, G. Rodighiero, G. Zamorani, J. Kurk (MPIA, L. Pozzetti, M. Bolzonella, M. Dickinson, M. Mignoli, Oaa), P. Cassata, P. Rosati, S. Berta","submitted_at":"2009-06-24T15:04:13Z","abstract_excerpt":"We present a study of a galaxy overdensity at z=1.6, Cl 0332-2742, uncovered in the Galaxy Mass Assembly ultra-deep Spectroscopic Survey (GMASS). We conservatively estimate the overdensity in redshift space for the spike, containing 42 galaxies at z=1.6, to be 8.3+/-1.5 and find a velocity dispersion of 500 km/s. A map of the surface density of galaxies at z=1.6 in the GMASS field shows that its structure is irregular. The differences in the physical properties of Cl 0332-2742 member and field galaxies agree with the latest hierarchical galaxy formation models: for overdensity members, the sta"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.4489","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":"2026-05-18T00:48:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"P9yAqupR6bXr6HZ2QpP5Id0MueR2hK3M97ATaltdSWMJfXcbVjbYU6VH83yTOaS27D0S6zj12LmXYEWI7v1oBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:00:20.736275Z"},"content_sha256":"1f28605e2113b1f4f9b8e44cd68b1f9de754849d8a8edcba756a673be0cf6797","schema_version":"1.0","event_id":"sha256:1f28605e2113b1f4f9b8e44cd68b1f9de754849d8a8edcba756a673be0cf6797"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QXO7YUZ3LII7YUAJXGZ6B3JWSX/bundle.json","state_url":"https://pith.science/pith/QXO7YUZ3LII7YUAJXGZ6B3JWSX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QXO7YUZ3LII7YUAJXGZ6B3JWSX/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":"2026-05-28T13:00:20Z","links":{"resolver":"https://pith.science/pith/QXO7YUZ3LII7YUAJXGZ6B3JWSX","bundle":"https://pith.science/pith/QXO7YUZ3LII7YUAJXGZ6B3JWSX/bundle.json","state":"https://pith.science/pith/QXO7YUZ3LII7YUAJXGZ6B3JWSX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QXO7YUZ3LII7YUAJXGZ6B3JWSX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:QXO7YUZ3LII7YUAJXGZ6B3JWSX","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":"c1923e6bb3e215ba1be7bea405921ee1fa17493580f06608fef7606ea1960f88","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-24T15:04:13Z","title_canon_sha256":"18cf663c3893d97260fa0ca4e9beae080ca4a5d71401293e6ec93e318c05eeca"},"schema_version":"1.0","source":{"id":"0906.4489","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0906.4489","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"arxiv_version","alias_value":"0906.4489v1","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.4489","created_at":"2026-05-18T00:48:21Z"},{"alias_kind":"pith_short_12","alias_value":"QXO7YUZ3LII7","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"QXO7YUZ3LII7YUAJ","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"QXO7YUZ3","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:1f28605e2113b1f4f9b8e44cd68b1f9de754849d8a8edcba756a673be0cf6797","target":"graph","created_at":"2026-05-18T00:48:21Z","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 present a study of a galaxy overdensity at z=1.6, Cl 0332-2742, uncovered in the Galaxy Mass Assembly ultra-deep Spectroscopic Survey (GMASS). We conservatively estimate the overdensity in redshift space for the spike, containing 42 galaxies at z=1.6, to be 8.3+/-1.5 and find a velocity dispersion of 500 km/s. A map of the surface density of galaxies at z=1.6 in the GMASS field shows that its structure is irregular. The differences in the physical properties of Cl 0332-2742 member and field galaxies agree with the latest hierarchical galaxy formation models: for overdensity members, the sta","authors_text":"A. Cimatti, A. Franceschini, A. Renzini, C. Halliday, E. Daddi, G. Rodighiero, G. Zamorani, J. Kurk (MPIA, L. Pozzetti, M. Bolzonella, M. Dickinson, M. Mignoli, Oaa), P. Cassata, P. Rosati, S. Berta","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-24T15:04:13Z","title":"Witnessing the assembly at z=1.6 of a galaxy cluster (GMASS ultradeep spectroscopy of galaxies at z~2 - V)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.4489","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":"sha256:7d6225174e960661249b73416f924b7b6deda7a5bb385dfcb3edf084c5fc2a07","target":"record","created_at":"2026-05-18T00:48:21Z","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":"c1923e6bb3e215ba1be7bea405921ee1fa17493580f06608fef7606ea1960f88","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-06-24T15:04:13Z","title_canon_sha256":"18cf663c3893d97260fa0ca4e9beae080ca4a5d71401293e6ec93e318c05eeca"},"schema_version":"1.0","source":{"id":"0906.4489","kind":"arxiv","version":1}},"canonical_sha256":"85ddfc533b5a11fc5009b9b3e0ed3695c61c463a61582627e70c344e732d3ee2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"85ddfc533b5a11fc5009b9b3e0ed3695c61c463a61582627e70c344e732d3ee2","first_computed_at":"2026-05-18T00:48:21.432340Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:48:21.432340Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Nf5BEKD1zHC0eiPUPwj1w/UI/rnJg8nP3iy7tjzY+mkBbxW7QIozwRfH4ZZEU6z/Az3rNhw5UHrGzj5sKu8HDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:48:21.433014Z","signed_message":"canonical_sha256_bytes"},"source_id":"0906.4489","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7d6225174e960661249b73416f924b7b6deda7a5bb385dfcb3edf084c5fc2a07","sha256:1f28605e2113b1f4f9b8e44cd68b1f9de754849d8a8edcba756a673be0cf6797"],"state_sha256":"dad5879e8bb238f43a2d022f89fc3290134d4e06687ff6d8b6180117c523de0a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rudD0fAUZ0VLye4OSAzasOoRg7O1D3LDWUvoIRVRdv9ng4UNRLnCurK+Nfwk1YkY1QVx46QCDwsKIImMepj7AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T13:00:20.738219Z","bundle_sha256":"db01f478f42509c89179db40d26b2fdfefc68710d3ebb18d1dfa2cb1f77b4f2d"}}