{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2000:ORDC2DIH4XNEHJ2ZSZQXMZKNJA","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":"a17951bd78ab7f5812c0b82accbc27c2b45dcd4d86d2f9a711b4b8bf3cde7789","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2000-04-14T21:03:54Z","title_canon_sha256":"dc7115873e4772bc91aa362d65fd231008bea9c20a54842e064d88613975e2c3"},"schema_version":"1.0","source":{"id":"astro-ph/0004210","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0004210","created_at":"2026-07-04T14:10:17Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0004210v3","created_at":"2026-07-04T14:10:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0004210","created_at":"2026-07-04T14:10:17Z"},{"alias_kind":"pith_short_12","alias_value":"ORDC2DIH4XNE","created_at":"2026-07-04T14:10:17Z"},{"alias_kind":"pith_short_16","alias_value":"ORDC2DIH4XNEHJ2Z","created_at":"2026-07-04T14:10:17Z"},{"alias_kind":"pith_short_8","alias_value":"ORDC2DIH","created_at":"2026-07-04T14:10:17Z"}],"graph_snapshots":[{"event_id":"sha256:bd5de7e0b974c001acb5510758ea548cf54647da9a59d038d90803f9d5bbd8c5","target":"graph","created_at":"2026-07-04T14:10:17Z","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/astro-ph/0004210/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We re-examine the age-velocity dispersion relation in the solar neighborhood using improved stellar age estimates that are based on Hipparcos parallaxes and recent stellar evolution calculations. The resulting relation shows that the Milky Way stellar disk was relatively quiescent, suffering little heating or dispersion increase between 3 and 9 Gyrs. However, at an age of 9 Gyrs there is an abrupt increase in the stellar velocity dispersions. To explain the abrupt increase (by almost a factor of 2) in dispersions we propose that the Milky Way suffered a minor merger 9 Gyrs ago that created the","authors_text":"Alice C. Quillen, Donald R. Garnett","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2000-04-14T21:03:54Z","title":"The saturation of disk heating in the solar neighborhood and evidence for a merger 9 Gyrs ago"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0004210","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":"sha256:97874046ef9825f90bf714d6177abbcd0586d71a0e1dd1aeb5713a85b65ee01e","target":"record","created_at":"2026-07-04T14:10:17Z","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":"a17951bd78ab7f5812c0b82accbc27c2b45dcd4d86d2f9a711b4b8bf3cde7789","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2000-04-14T21:03:54Z","title_canon_sha256":"dc7115873e4772bc91aa362d65fd231008bea9c20a54842e064d88613975e2c3"},"schema_version":"1.0","source":{"id":"astro-ph/0004210","kind":"arxiv","version":3}},"canonical_sha256":"74462d0d07e5da43a759966176654d483f89f0fb3c84bf59cde3a00c74dfe0ff","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"74462d0d07e5da43a759966176654d483f89f0fb3c84bf59cde3a00c74dfe0ff","first_computed_at":"2026-07-04T14:10:17.713543Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T14:10:17.713543Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"czewZWbG6ZrLkjCRe/HhFGl9NUPBeSVBn0IO1cjmlwcokOuy4BJmAmngPkWHC28wEwdu15VyDhJ8SKv0onY7BA==","signature_status":"signed_v1","signed_at":"2026-07-04T14:10:17.713951Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0004210","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:97874046ef9825f90bf714d6177abbcd0586d71a0e1dd1aeb5713a85b65ee01e","sha256:bd5de7e0b974c001acb5510758ea548cf54647da9a59d038d90803f9d5bbd8c5"],"state_sha256":"248eff2a088eeb71d7de3c90f66b67a35ca278d9fcfeadf7b3c966d401638403"}