{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:WADS636KMCOYGWFXJM3TT3D3T4","short_pith_number":"pith:WADS636K","canonical_record":{"source":{"id":"1112.3958","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-12-16T21:00:00Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"09e54f11de6a974fccd82b87409254a8feaf8d64c966e1c4539988126f674b0e","abstract_canon_sha256":"c49eda5f82839e9eff36af9929229afec15a9074d725b9a7e42bb47495eedb42"},"schema_version":"1.0"},"canonical_sha256":"b0072f6fca609d8358b74b3739ec7b9f3a336cbe797e2cd9150aa1cadd322818","source":{"kind":"arxiv","id":"1112.3958","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1112.3958","created_at":"2026-05-18T01:59:06Z"},{"alias_kind":"arxiv_version","alias_value":"1112.3958v1","created_at":"2026-05-18T01:59:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1112.3958","created_at":"2026-05-18T01:59:06Z"},{"alias_kind":"pith_short_12","alias_value":"WADS636KMCOY","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_16","alias_value":"WADS636KMCOYGWFX","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_8","alias_value":"WADS636K","created_at":"2026-05-18T12:26:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:WADS636KMCOYGWFXJM3TT3D3T4","target":"record","payload":{"canonical_record":{"source":{"id":"1112.3958","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-12-16T21:00:00Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"09e54f11de6a974fccd82b87409254a8feaf8d64c966e1c4539988126f674b0e","abstract_canon_sha256":"c49eda5f82839e9eff36af9929229afec15a9074d725b9a7e42bb47495eedb42"},"schema_version":"1.0"},"canonical_sha256":"b0072f6fca609d8358b74b3739ec7b9f3a336cbe797e2cd9150aa1cadd322818","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:59:06.456417Z","signature_b64":"IeRWobwjJZNH+b8IgKz7bMSRSdbdPRqPiOLXlalpbUD2vyvJVM/VnuagJzYLEQ46V9dbiRDpU/9HS6cUodLhBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b0072f6fca609d8358b74b3739ec7b9f3a336cbe797e2cd9150aa1cadd322818","last_reissued_at":"2026-05-18T01:59:06.455524Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:59:06.455524Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1112.3958","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":"2026-05-18T01:59:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BCIHWWjz6INh4bXfBC3opkTRxAvKQUULNFftL661AbdY8pyGJdf3dhCSxB18i1hhnZef3Xg/SywpKdRy31PVCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T02:01:39.313172Z"},"content_sha256":"efc47f18f5253aef6db6fbb6e04eef22d9a8c45dd7108f0e0d83464890273dd8","schema_version":"1.0","event_id":"sha256:efc47f18f5253aef6db6fbb6e04eef22d9a8c45dd7108f0e0d83464890273dd8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:WADS636KMCOYGWFXJM3TT3D3T4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Old Massive Globular Clusters and the Stellar Halo of the Dwarf Starburst Galaxy NGC 4449","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Anil C. Seth, Jay Strader, Nelson Caldwell","submitted_at":"2011-12-16T21:00:00Z","abstract_excerpt":"We use Hubble Space Telescope imaging to show that the nearby dwarf starburst galaxy NGC 4449 has an unusual abundance of luminous red star clusters. Joint constraints from integrated photometry, low-resolution spectroscopy, dynamical mass-to-light ratios, and resolved color-magnitude diagrams provide evidence that some of these clusters are old globular clusters. Spectroscopic data for two massive clusters suggest intermediate metallicities ([Fe/H] ~ -1) and subsolar Mg enhancement ([Mg/Fe] ~ -0.1 to -0.2). One of these clusters may be the nucleus of a tidally disrupting dwarf galaxy; the oth"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1112.3958","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":"2026-05-18T01:59:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xrjMWxeulmcKMGHtQqM9OM2Qr8GsRCvxt//XNyy7kyt4RjjbIY/kPr+7wQITyJgDTpNnC/9DhvmKzWK0lh0iDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T02:01:39.313878Z"},"content_sha256":"4c061db3004598f7967b9a11cceed5fe552af511e361b75dd6c971a9f6c7fb1a","schema_version":"1.0","event_id":"sha256:4c061db3004598f7967b9a11cceed5fe552af511e361b75dd6c971a9f6c7fb1a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WADS636KMCOYGWFXJM3TT3D3T4/bundle.json","state_url":"https://pith.science/pith/WADS636KMCOYGWFXJM3TT3D3T4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WADS636KMCOYGWFXJM3TT3D3T4/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":"2026-06-08T02:01:39Z","links":{"resolver":"https://pith.science/pith/WADS636KMCOYGWFXJM3TT3D3T4","bundle":"https://pith.science/pith/WADS636KMCOYGWFXJM3TT3D3T4/bundle.json","state":"https://pith.science/pith/WADS636KMCOYGWFXJM3TT3D3T4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WADS636KMCOYGWFXJM3TT3D3T4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:WADS636KMCOYGWFXJM3TT3D3T4","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":"c49eda5f82839e9eff36af9929229afec15a9074d725b9a7e42bb47495eedb42","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-12-16T21:00:00Z","title_canon_sha256":"09e54f11de6a974fccd82b87409254a8feaf8d64c966e1c4539988126f674b0e"},"schema_version":"1.0","source":{"id":"1112.3958","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1112.3958","created_at":"2026-05-18T01:59:06Z"},{"alias_kind":"arxiv_version","alias_value":"1112.3958v1","created_at":"2026-05-18T01:59:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1112.3958","created_at":"2026-05-18T01:59:06Z"},{"alias_kind":"pith_short_12","alias_value":"WADS636KMCOY","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_16","alias_value":"WADS636KMCOYGWFX","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_8","alias_value":"WADS636K","created_at":"2026-05-18T12:26:44Z"}],"graph_snapshots":[{"event_id":"sha256:4c061db3004598f7967b9a11cceed5fe552af511e361b75dd6c971a9f6c7fb1a","target":"graph","created_at":"2026-05-18T01:59:06Z","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 use Hubble Space Telescope imaging to show that the nearby dwarf starburst galaxy NGC 4449 has an unusual abundance of luminous red star clusters. Joint constraints from integrated photometry, low-resolution spectroscopy, dynamical mass-to-light ratios, and resolved color-magnitude diagrams provide evidence that some of these clusters are old globular clusters. Spectroscopic data for two massive clusters suggest intermediate metallicities ([Fe/H] ~ -1) and subsolar Mg enhancement ([Mg/Fe] ~ -0.1 to -0.2). One of these clusters may be the nucleus of a tidally disrupting dwarf galaxy; the oth","authors_text":"Anil C. Seth, Jay Strader, Nelson Caldwell","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-12-16T21:00:00Z","title":"Old Massive Globular Clusters and the Stellar Halo of the Dwarf Starburst Galaxy NGC 4449"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1112.3958","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:efc47f18f5253aef6db6fbb6e04eef22d9a8c45dd7108f0e0d83464890273dd8","target":"record","created_at":"2026-05-18T01:59:06Z","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":"c49eda5f82839e9eff36af9929229afec15a9074d725b9a7e42bb47495eedb42","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-12-16T21:00:00Z","title_canon_sha256":"09e54f11de6a974fccd82b87409254a8feaf8d64c966e1c4539988126f674b0e"},"schema_version":"1.0","source":{"id":"1112.3958","kind":"arxiv","version":1}},"canonical_sha256":"b0072f6fca609d8358b74b3739ec7b9f3a336cbe797e2cd9150aa1cadd322818","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b0072f6fca609d8358b74b3739ec7b9f3a336cbe797e2cd9150aa1cadd322818","first_computed_at":"2026-05-18T01:59:06.455524Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:59:06.455524Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IeRWobwjJZNH+b8IgKz7bMSRSdbdPRqPiOLXlalpbUD2vyvJVM/VnuagJzYLEQ46V9dbiRDpU/9HS6cUodLhBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:59:06.456417Z","signed_message":"canonical_sha256_bytes"},"source_id":"1112.3958","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:efc47f18f5253aef6db6fbb6e04eef22d9a8c45dd7108f0e0d83464890273dd8","sha256:4c061db3004598f7967b9a11cceed5fe552af511e361b75dd6c971a9f6c7fb1a"],"state_sha256":"1dca109b995498b45caa7ddc910862ee65cbf17cd2c288c543769cc3987ab8cd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TsOrJQEwkzvd9pf9MyxGA0aQMTFTOZBm0dkFDwTsZMhRxAyW6jXdk3B7ZdfUx+m54DxFrkSc9UcPMvrn7sGyBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T02:01:39.317611Z","bundle_sha256":"fe20a3b8d9c40629bc7195a564f1b4adf70f1792a2d36c05e52c4a8518d675a7"}}