{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1998:MZC5AGDIDYR3Y5I2BDBGTVY5YO","short_pith_number":"pith:MZC5AGDI","canonical_record":{"source":{"id":"astro-ph/9812439","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-23T15:54:37Z","cross_cats_sorted":[],"title_canon_sha256":"fd91d4884633ddbfae8bde2091c3f4681ee088ae33e9b55ae3582b4d54ee8812","abstract_canon_sha256":"33c00953d40730d2834587cf0707b980107bf9d65e3783f7b633b5f1a75ab3e7"},"schema_version":"1.0"},"canonical_sha256":"6645d018681e23bc751a08c269d71dc3817d2245604392a838316b100ba2029b","source":{"kind":"arxiv","id":"astro-ph/9812439","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9812439","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9812439v1","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9812439","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"pith_short_12","alias_value":"MZC5AGDIDYR3","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"MZC5AGDIDYR3Y5I2","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"MZC5AGDI","created_at":"2026-05-18T12:25:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1998:MZC5AGDIDYR3Y5I2BDBGTVY5YO","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9812439","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-23T15:54:37Z","cross_cats_sorted":[],"title_canon_sha256":"fd91d4884633ddbfae8bde2091c3f4681ee088ae33e9b55ae3582b4d54ee8812","abstract_canon_sha256":"33c00953d40730d2834587cf0707b980107bf9d65e3783f7b633b5f1a75ab3e7"},"schema_version":"1.0"},"canonical_sha256":"6645d018681e23bc751a08c269d71dc3817d2245604392a838316b100ba2029b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:36.704136Z","signature_b64":"Vfao3xRZScQBwSDq4teD6AEE9gcDD9kUo7O3ynqDMM0u9Pqsl6YMF7nvIvTS7wTfJ36vhjUEDxj7yZkw6p/6DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6645d018681e23bc751a08c269d71dc3817d2245604392a838316b100ba2029b","last_reissued_at":"2026-05-18T01:07:36.703671Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:36.703671Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9812439","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":"2026-05-18T01:07:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"A1EMTBJFoSVw26d26MbGQJObFdhNissnErIW60Oski5t2vQ0pHnkWZ3RzUfrfBOcgLRUUMT5DGY4fhhz3ucsDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T03:26:26.695873Z"},"content_sha256":"bbc2e5e89654783df674f9f7dbf7238e3428d5985cc0b453202ca4ba1bee6600","schema_version":"1.0","event_id":"sha256:bbc2e5e89654783df674f9f7dbf7238e3428d5985cc0b453202ca4ba1bee6600"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1998:MZC5AGDIDYR3Y5I2BDBGTVY5YO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Chemically Decoupled Nuclei in the Spiral Galaxies NGC 4216 and NGC 4501","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. N. Burenkov, O. K. Sil'chenko, V. V. Vlasyuk","submitted_at":"1998-12-23T15:54:37Z","abstract_excerpt":"By using bidimensional spectral data obtained at the 6m telescope for the Virgo spirals NGC 4216 and NGC 4501, we have found chemically distinct metal-rich nuclei in these galaxies. Under the assumption of equal ages for the nuclear and bulge stellar populations, the metallicity difference between the nuclei and their environments in the galaxies is estimated as a factor of 2. But we have also found an age difference between the nucleus and the bulge in NGC 4216: age-metallicity disentangling on the diagrams (H-beta, Mgb), (H-beta, [MgFe]), and (H-beta, $<Fe>$) results in an age estimate for t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9812439","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":"2026-05-18T01:07:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fs3X/pE2gjs3iZs7Va4a2/TH2NaBs77jF0ie6me6LxkSu9BOYNYnnI+t/CJsQsaBH1MEF8wpmCCYR6dmVKPUBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T03:26:26.696544Z"},"content_sha256":"2a05122c644c432077dc8ffa7d0eda9902d4c09401f82e067b90dd25726ac793","schema_version":"1.0","event_id":"sha256:2a05122c644c432077dc8ffa7d0eda9902d4c09401f82e067b90dd25726ac793"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MZC5AGDIDYR3Y5I2BDBGTVY5YO/bundle.json","state_url":"https://pith.science/pith/MZC5AGDIDYR3Y5I2BDBGTVY5YO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MZC5AGDIDYR3Y5I2BDBGTVY5YO/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":"2026-06-05T03:26:26Z","links":{"resolver":"https://pith.science/pith/MZC5AGDIDYR3Y5I2BDBGTVY5YO","bundle":"https://pith.science/pith/MZC5AGDIDYR3Y5I2BDBGTVY5YO/bundle.json","state":"https://pith.science/pith/MZC5AGDIDYR3Y5I2BDBGTVY5YO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MZC5AGDIDYR3Y5I2BDBGTVY5YO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:MZC5AGDIDYR3Y5I2BDBGTVY5YO","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":"33c00953d40730d2834587cf0707b980107bf9d65e3783f7b633b5f1a75ab3e7","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-23T15:54:37Z","title_canon_sha256":"fd91d4884633ddbfae8bde2091c3f4681ee088ae33e9b55ae3582b4d54ee8812"},"schema_version":"1.0","source":{"id":"astro-ph/9812439","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9812439","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9812439v1","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9812439","created_at":"2026-05-18T01:07:36Z"},{"alias_kind":"pith_short_12","alias_value":"MZC5AGDIDYR3","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"MZC5AGDIDYR3Y5I2","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"MZC5AGDI","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:2a05122c644c432077dc8ffa7d0eda9902d4c09401f82e067b90dd25726ac793","target":"graph","created_at":"2026-05-18T01:07:36Z","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"},"paper":{"abstract_excerpt":"By using bidimensional spectral data obtained at the 6m telescope for the Virgo spirals NGC 4216 and NGC 4501, we have found chemically distinct metal-rich nuclei in these galaxies. Under the assumption of equal ages for the nuclear and bulge stellar populations, the metallicity difference between the nuclei and their environments in the galaxies is estimated as a factor of 2. But we have also found an age difference between the nucleus and the bulge in NGC 4216: age-metallicity disentangling on the diagrams (H-beta, Mgb), (H-beta, [MgFe]), and (H-beta, $<Fe>$) results in an age estimate for t","authors_text":"A. N. Burenkov, O. K. Sil'chenko, V. V. Vlasyuk","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1998-12-23T15:54:37Z","title":"Chemically Decoupled Nuclei in the Spiral Galaxies NGC 4216 and NGC 4501"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9812439","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:bbc2e5e89654783df674f9f7dbf7238e3428d5985cc0b453202ca4ba1bee6600","target":"record","created_at":"2026-05-18T01:07:36Z","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":"33c00953d40730d2834587cf0707b980107bf9d65e3783f7b633b5f1a75ab3e7","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1998-12-23T15:54:37Z","title_canon_sha256":"fd91d4884633ddbfae8bde2091c3f4681ee088ae33e9b55ae3582b4d54ee8812"},"schema_version":"1.0","source":{"id":"astro-ph/9812439","kind":"arxiv","version":1}},"canonical_sha256":"6645d018681e23bc751a08c269d71dc3817d2245604392a838316b100ba2029b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6645d018681e23bc751a08c269d71dc3817d2245604392a838316b100ba2029b","first_computed_at":"2026-05-18T01:07:36.703671Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:07:36.703671Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Vfao3xRZScQBwSDq4teD6AEE9gcDD9kUo7O3ynqDMM0u9Pqsl6YMF7nvIvTS7wTfJ36vhjUEDxj7yZkw6p/6DA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:07:36.704136Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9812439","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bbc2e5e89654783df674f9f7dbf7238e3428d5985cc0b453202ca4ba1bee6600","sha256:2a05122c644c432077dc8ffa7d0eda9902d4c09401f82e067b90dd25726ac793"],"state_sha256":"158a2f83118be98a56713080e588d34dad0149ea6c49957403b914b3af41f9b3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"57Wmu+3CtPukWJyFxGIktFjYMCMqfFSl110cvf+nmEbUZi8OZskOM+OSFTuy4AS7pgJdZK67EKLSiDqKyrGgAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T03:26:26.700367Z","bundle_sha256":"697b713d2069411f5dc736818b9874619eeb6fab9d812d1972b02c6f1ab3b618"}}