{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:TA54NH4N5R63RB6RVL5RYPYI33","short_pith_number":"pith:TA54NH4N","canonical_record":{"source":{"id":"1401.1835","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-08T21:32:22Z","cross_cats_sorted":[],"title_canon_sha256":"52d6f7c466501eee4b730f28a74e608c27ecd5a96063a1b1e4140ad559e7dfc2","abstract_canon_sha256":"68f65fec50a76390d8066b8b6c1e33613f7deec662c569ded7a77ed18a5f2b2f"},"schema_version":"1.0"},"canonical_sha256":"983bc69f8dec7db887d1aafb1c3f08def9c313808eca1aee7f29ef49ad2e3060","source":{"kind":"arxiv","id":"1401.1835","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.1835","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"arxiv_version","alias_value":"1401.1835v1","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.1835","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"pith_short_12","alias_value":"TA54NH4N5R63","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"TA54NH4N5R63RB6R","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"TA54NH4N","created_at":"2026-05-18T12:28:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:TA54NH4N5R63RB6RVL5RYPYI33","target":"record","payload":{"canonical_record":{"source":{"id":"1401.1835","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-08T21:32:22Z","cross_cats_sorted":[],"title_canon_sha256":"52d6f7c466501eee4b730f28a74e608c27ecd5a96063a1b1e4140ad559e7dfc2","abstract_canon_sha256":"68f65fec50a76390d8066b8b6c1e33613f7deec662c569ded7a77ed18a5f2b2f"},"schema_version":"1.0"},"canonical_sha256":"983bc69f8dec7db887d1aafb1c3f08def9c313808eca1aee7f29ef49ad2e3060","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:45:27.312302Z","signature_b64":"hZmaMaGcCB4c/RswBD1cBhfX9i3kXzoiXFmQNqJd2cE78xpTY5u0+ZiHM+09EsiK16qdMAHA5Z6p1Fqp8opXBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"983bc69f8dec7db887d1aafb1c3f08def9c313808eca1aee7f29ef49ad2e3060","last_reissued_at":"2026-05-18T01:45:27.311839Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:45:27.311839Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1401.1835","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":"2026-05-18T01:45:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UUHc+ElD4QSFhyPdpDNZDlhtC9lKfB+7g7D5TehLFviq01SJzqyyJD8WNr7s4GY9jDSnns69OWRFUbIzhTs+Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T15:23:47.671457Z"},"content_sha256":"8b6d7fa4547d908d6d6aa93c66793c9f81193263794efeb07292de1f1157d71b","schema_version":"1.0","event_id":"sha256:8b6d7fa4547d908d6d6aa93c66793c9f81193263794efeb07292de1f1157d71b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:TA54NH4N5R63RB6RVL5RYPYI33","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The dominant epoch of star formation in the Milky Way formed the thick disc","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Ana Gomez, David Katz, Francoise Combes, Matthew D. Lehnert, Misha Haywood, Owain N. Snaith, Paola Di Matteo","submitted_at":"2014-01-08T21:32:22Z","abstract_excerpt":"We report the first robust measurement of the Milky Way star formation history using the imprint left on chemical abundances of long-lived stars. The formation of the Galactic thick disc occurs during an intense star formation phase between 9.0 (z~1.5) and 12.5 Gyr (z~4.5) ago and is followed by a dip (at z~1.1) lasting about 1 Gyr. Our results imply that the thick disc is as massive as the Milky Way's thin disc, suggesting a fundamental role of this component in the genesis of our Galaxy, something that had been largely unrecognized. This new picture implies that huge quantities of gas necess"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.1835","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":"2026-05-18T01:45:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GdaScjLHiTOaVp4oMCk7FfFXwlfSrCiK0suc4aAHFCg4oAA2R8caP1izYQN6wh4cNj1BvVvcc2FgKL8zsre7CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T15:23:47.672163Z"},"content_sha256":"f8f6e9f08680d8fd23b2fd527366050f0bb7a4b57cbf7fe41b936aa1fe3bab52","schema_version":"1.0","event_id":"sha256:f8f6e9f08680d8fd23b2fd527366050f0bb7a4b57cbf7fe41b936aa1fe3bab52"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TA54NH4N5R63RB6RVL5RYPYI33/bundle.json","state_url":"https://pith.science/pith/TA54NH4N5R63RB6RVL5RYPYI33/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TA54NH4N5R63RB6RVL5RYPYI33/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":"2026-05-25T15:23:47Z","links":{"resolver":"https://pith.science/pith/TA54NH4N5R63RB6RVL5RYPYI33","bundle":"https://pith.science/pith/TA54NH4N5R63RB6RVL5RYPYI33/bundle.json","state":"https://pith.science/pith/TA54NH4N5R63RB6RVL5RYPYI33/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TA54NH4N5R63RB6RVL5RYPYI33/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:TA54NH4N5R63RB6RVL5RYPYI33","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":"68f65fec50a76390d8066b8b6c1e33613f7deec662c569ded7a77ed18a5f2b2f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-08T21:32:22Z","title_canon_sha256":"52d6f7c466501eee4b730f28a74e608c27ecd5a96063a1b1e4140ad559e7dfc2"},"schema_version":"1.0","source":{"id":"1401.1835","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.1835","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"arxiv_version","alias_value":"1401.1835v1","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.1835","created_at":"2026-05-18T01:45:27Z"},{"alias_kind":"pith_short_12","alias_value":"TA54NH4N5R63","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"TA54NH4N5R63RB6R","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"TA54NH4N","created_at":"2026-05-18T12:28:49Z"}],"graph_snapshots":[{"event_id":"sha256:f8f6e9f08680d8fd23b2fd527366050f0bb7a4b57cbf7fe41b936aa1fe3bab52","target":"graph","created_at":"2026-05-18T01:45:27Z","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 report the first robust measurement of the Milky Way star formation history using the imprint left on chemical abundances of long-lived stars. The formation of the Galactic thick disc occurs during an intense star formation phase between 9.0 (z~1.5) and 12.5 Gyr (z~4.5) ago and is followed by a dip (at z~1.1) lasting about 1 Gyr. Our results imply that the thick disc is as massive as the Milky Way's thin disc, suggesting a fundamental role of this component in the genesis of our Galaxy, something that had been largely unrecognized. This new picture implies that huge quantities of gas necess","authors_text":"Ana Gomez, David Katz, Francoise Combes, Matthew D. Lehnert, Misha Haywood, Owain N. Snaith, Paola Di Matteo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-08T21:32:22Z","title":"The dominant epoch of star formation in the Milky Way formed the thick disc"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.1835","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":"sha256:8b6d7fa4547d908d6d6aa93c66793c9f81193263794efeb07292de1f1157d71b","target":"record","created_at":"2026-05-18T01:45:27Z","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":"68f65fec50a76390d8066b8b6c1e33613f7deec662c569ded7a77ed18a5f2b2f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-08T21:32:22Z","title_canon_sha256":"52d6f7c466501eee4b730f28a74e608c27ecd5a96063a1b1e4140ad559e7dfc2"},"schema_version":"1.0","source":{"id":"1401.1835","kind":"arxiv","version":1}},"canonical_sha256":"983bc69f8dec7db887d1aafb1c3f08def9c313808eca1aee7f29ef49ad2e3060","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"983bc69f8dec7db887d1aafb1c3f08def9c313808eca1aee7f29ef49ad2e3060","first_computed_at":"2026-05-18T01:45:27.311839Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:45:27.311839Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hZmaMaGcCB4c/RswBD1cBhfX9i3kXzoiXFmQNqJd2cE78xpTY5u0+ZiHM+09EsiK16qdMAHA5Z6p1Fqp8opXBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:45:27.312302Z","signed_message":"canonical_sha256_bytes"},"source_id":"1401.1835","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8b6d7fa4547d908d6d6aa93c66793c9f81193263794efeb07292de1f1157d71b","sha256:f8f6e9f08680d8fd23b2fd527366050f0bb7a4b57cbf7fe41b936aa1fe3bab52"],"state_sha256":"be3e313d7ea0e0c4379c4b012b7735f54a25ddc4bd83ea3090a343d36b1f86e4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uaUYb2tQbyKaTpA9D0BGknVP2g0Fal+qKa5iKwxkCLNWFHipfFsK71D0C2H8DbnQmnGfPPVKLX0+SMy5eBXcBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T15:23:47.676116Z","bundle_sha256":"41fadb21f004249994fa68c013228589c77b5eb4182e34a2ab40502109d38221"}}