{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:NCITJGVP7G2DC7R77CEMX7A35O","short_pith_number":"pith:NCITJGVP","canonical_record":{"source":{"id":"0711.1493","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2007-11-09T16:04:23Z","cross_cats_sorted":[],"title_canon_sha256":"d183167d8577fce725c84bcb8a1aeb4242e8e7ff983a7b09b0e4566f5c724b6d","abstract_canon_sha256":"3d54d3c44bcb6f5a9df61c0324134fdc4e3acae1dbdfa1f0f969f2c8793ce1ce"},"schema_version":"1.0"},"canonical_sha256":"6891349aaff9b4317e3ff888cbfc1bebb9f8e5b77cd3d156fb0a0374025be830","source":{"kind":"arxiv","id":"0711.1493","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0711.1493","created_at":"2026-07-04T17:06:36Z"},{"alias_kind":"arxiv_version","alias_value":"0711.1493v3","created_at":"2026-07-04T17:06:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0711.1493","created_at":"2026-07-04T17:06:36Z"},{"alias_kind":"pith_short_12","alias_value":"NCITJGVP7G2D","created_at":"2026-07-04T17:06:36Z"},{"alias_kind":"pith_short_16","alias_value":"NCITJGVP7G2DC7R7","created_at":"2026-07-04T17:06:36Z"},{"alias_kind":"pith_short_8","alias_value":"NCITJGVP","created_at":"2026-07-04T17:06:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:NCITJGVP7G2DC7R77CEMX7A35O","target":"record","payload":{"canonical_record":{"source":{"id":"0711.1493","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2007-11-09T16:04:23Z","cross_cats_sorted":[],"title_canon_sha256":"d183167d8577fce725c84bcb8a1aeb4242e8e7ff983a7b09b0e4566f5c724b6d","abstract_canon_sha256":"3d54d3c44bcb6f5a9df61c0324134fdc4e3acae1dbdfa1f0f969f2c8793ce1ce"},"schema_version":"1.0"},"canonical_sha256":"6891349aaff9b4317e3ff888cbfc1bebb9f8e5b77cd3d156fb0a0374025be830","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:06:36.384540Z","signature_b64":"6QT9IHUQ9ZQVcwzQPTKFNLh7HJSzjzDO0pSsx8V9RFPmwkoR0Rwp8s8RgXOiuCTmTuc17FLP+nzq5XaMQrMdAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6891349aaff9b4317e3ff888cbfc1bebb9f8e5b77cd3d156fb0a0374025be830","last_reissued_at":"2026-07-04T17:06:36.384134Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:06:36.384134Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0711.1493","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T17:06:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c9cRJi0UcmXsqCDHPPcTU5kPPAT3IX/547/QvbgiVDDA3CZqLHsx9HslvFtba5Mzotccc6ApYFa4chC6+X24AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T14:20:28.153809Z"},"content_sha256":"f319c61aa7486431150e7fd2be2457a90dfd14f5f34fc31589f3dd0322570c7d","schema_version":"1.0","event_id":"sha256:f319c61aa7486431150e7fd2be2457a90dfd14f5f34fc31589f3dd0322570c7d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:NCITJGVP7G2DC7R77CEMX7A35O","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The role of minor mergers in the recent star formation history of early-type galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Joseph Silk, Sadegh Khochfar, Scott Kay, Sebastien Peirani, Sugata Kaviraj","submitted_at":"2007-11-09T16:04:23Z","abstract_excerpt":"We demonstrate that the large scatter in the ultra-violet (UV) colours of intermediate-mass early-type galaxies in the local Universe and the inferred low-level recent star formation in these objects can be reproduced by minor mergers in the standard LCDM cosmology. Numerical simulations of mergers with mass ratios less than or equal to 1:4, with reasonable assumptions for the ages, metallicities and dust properties of the merger progenitors, produce good agreement to the observed UV colours of the early-type population, if the infalling satellites are assumed to have (cold) gas fractions grea"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0711.1493","kind":"arxiv","version":3},"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/0711.1493/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T17:06:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qGW7NW91hlGIJ11hJENoehajmXbW0Ut8pqX2ZQH22e3jDp623eiQBHvCgCVoLc49m05F1w69ESPuhPVaFt96AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T14:20:28.154249Z"},"content_sha256":"de3be828727b6665e6429d5c926c8504b6bed0f2c00047cb38d7e92f833d837a","schema_version":"1.0","event_id":"sha256:de3be828727b6665e6429d5c926c8504b6bed0f2c00047cb38d7e92f833d837a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NCITJGVP7G2DC7R77CEMX7A35O/bundle.json","state_url":"https://pith.science/pith/NCITJGVP7G2DC7R77CEMX7A35O/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NCITJGVP7G2DC7R77CEMX7A35O/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":"2026-07-31T14:20:28Z","links":{"resolver":"https://pith.science/pith/NCITJGVP7G2DC7R77CEMX7A35O","bundle":"https://pith.science/pith/NCITJGVP7G2DC7R77CEMX7A35O/bundle.json","state":"https://pith.science/pith/NCITJGVP7G2DC7R77CEMX7A35O/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NCITJGVP7G2DC7R77CEMX7A35O/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:NCITJGVP7G2DC7R77CEMX7A35O","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":"3d54d3c44bcb6f5a9df61c0324134fdc4e3acae1dbdfa1f0f969f2c8793ce1ce","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2007-11-09T16:04:23Z","title_canon_sha256":"d183167d8577fce725c84bcb8a1aeb4242e8e7ff983a7b09b0e4566f5c724b6d"},"schema_version":"1.0","source":{"id":"0711.1493","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0711.1493","created_at":"2026-07-04T17:06:36Z"},{"alias_kind":"arxiv_version","alias_value":"0711.1493v3","created_at":"2026-07-04T17:06:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0711.1493","created_at":"2026-07-04T17:06:36Z"},{"alias_kind":"pith_short_12","alias_value":"NCITJGVP7G2D","created_at":"2026-07-04T17:06:36Z"},{"alias_kind":"pith_short_16","alias_value":"NCITJGVP7G2DC7R7","created_at":"2026-07-04T17:06:36Z"},{"alias_kind":"pith_short_8","alias_value":"NCITJGVP","created_at":"2026-07-04T17:06:36Z"}],"graph_snapshots":[{"event_id":"sha256:de3be828727b6665e6429d5c926c8504b6bed0f2c00047cb38d7e92f833d837a","target":"graph","created_at":"2026-07-04T17:06:36Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/0711.1493/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We demonstrate that the large scatter in the ultra-violet (UV) colours of intermediate-mass early-type galaxies in the local Universe and the inferred low-level recent star formation in these objects can be reproduced by minor mergers in the standard LCDM cosmology. Numerical simulations of mergers with mass ratios less than or equal to 1:4, with reasonable assumptions for the ages, metallicities and dust properties of the merger progenitors, produce good agreement to the observed UV colours of the early-type population, if the infalling satellites are assumed to have (cold) gas fractions grea","authors_text":"Joseph Silk, Sadegh Khochfar, Scott Kay, Sebastien Peirani, Sugata Kaviraj","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2007-11-09T16:04:23Z","title":"The role of minor mergers in the recent star formation history of early-type galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0711.1493","kind":"arxiv","version":3},"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:f319c61aa7486431150e7fd2be2457a90dfd14f5f34fc31589f3dd0322570c7d","target":"record","created_at":"2026-07-04T17:06:36Z","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":"3d54d3c44bcb6f5a9df61c0324134fdc4e3acae1dbdfa1f0f969f2c8793ce1ce","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2007-11-09T16:04:23Z","title_canon_sha256":"d183167d8577fce725c84bcb8a1aeb4242e8e7ff983a7b09b0e4566f5c724b6d"},"schema_version":"1.0","source":{"id":"0711.1493","kind":"arxiv","version":3}},"canonical_sha256":"6891349aaff9b4317e3ff888cbfc1bebb9f8e5b77cd3d156fb0a0374025be830","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6891349aaff9b4317e3ff888cbfc1bebb9f8e5b77cd3d156fb0a0374025be830","first_computed_at":"2026-07-04T17:06:36.384134Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:06:36.384134Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6QT9IHUQ9ZQVcwzQPTKFNLh7HJSzjzDO0pSsx8V9RFPmwkoR0Rwp8s8RgXOiuCTmTuc17FLP+nzq5XaMQrMdAQ==","signature_status":"signed_v1","signed_at":"2026-07-04T17:06:36.384540Z","signed_message":"canonical_sha256_bytes"},"source_id":"0711.1493","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f319c61aa7486431150e7fd2be2457a90dfd14f5f34fc31589f3dd0322570c7d","sha256:de3be828727b6665e6429d5c926c8504b6bed0f2c00047cb38d7e92f833d837a"],"state_sha256":"cec4aca9041a8cc18403d821337a809a766e017a7101505aa41ec5cf5c7884f8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MxgSF+BDf/sUb6wMSmf8aK2E+Aoz79gW2To4vVksd8XOzlPa5vvcE1lhOUCCvFRJuzp56UO4wCT8ii2hKo6HBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-31T14:20:28.157071Z","bundle_sha256":"534a15c9066e5153ec558f84ee061f2f5e9805fa75ad9c7973023a322cb25598"}}