{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:GHMVNOBHE3CZVUIMU3YMNSIUGI","short_pith_number":"pith:GHMVNOBH","canonical_record":{"source":{"id":"1302.6594","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-26T21:00:06Z","cross_cats_sorted":[],"title_canon_sha256":"bc951430cd54fa6ad6167f9c25319ac16e331bb7b3d0352e48e59857b58b62ea","abstract_canon_sha256":"a829fa447612c365f6a5a3c0dfd2fafd672ac7abefd1e5967b6e0f8af4582a81"},"schema_version":"1.0"},"canonical_sha256":"31d956b82726c59ad10ca6f0c6c914323788894230832849f3a05b0e83ce4d1a","source":{"kind":"arxiv","id":"1302.6594","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.6594","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"arxiv_version","alias_value":"1302.6594v1","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.6594","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"pith_short_12","alias_value":"GHMVNOBHE3CZ","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"GHMVNOBHE3CZVUIM","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"GHMVNOBH","created_at":"2026-05-18T12:27:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:GHMVNOBHE3CZVUIMU3YMNSIUGI","target":"record","payload":{"canonical_record":{"source":{"id":"1302.6594","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-26T21:00:06Z","cross_cats_sorted":[],"title_canon_sha256":"bc951430cd54fa6ad6167f9c25319ac16e331bb7b3d0352e48e59857b58b62ea","abstract_canon_sha256":"a829fa447612c365f6a5a3c0dfd2fafd672ac7abefd1e5967b6e0f8af4582a81"},"schema_version":"1.0"},"canonical_sha256":"31d956b82726c59ad10ca6f0c6c914323788894230832849f3a05b0e83ce4d1a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:51:27.073769Z","signature_b64":"Uu9UgNHjputOO587b/qjPMHGBMZr0LqmFo6Fr6QgP58hLofIufG3m5PZmdpEpdh4ZwJz2Db0Fco/GvC0zTuMCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"31d956b82726c59ad10ca6f0c6c914323788894230832849f3a05b0e83ce4d1a","last_reissued_at":"2026-05-18T01:51:27.073130Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:51:27.073130Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.6594","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":"2026-05-18T01:51:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"h5iyPBPBRmFoYgPyfXpT8gFp9/VhiMiNAlv+JU+pwq2rBuxnsxrB1i0p3zMJweEWg7MKAQlrSNJWHus4x1uPDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T12:31:27.130744Z"},"content_sha256":"2704e4506518273a6e9a87b17ad8843632af8229d7a796ba49a5bd9debaa32f8","schema_version":"1.0","event_id":"sha256:2704e4506518273a6e9a87b17ad8843632af8229d7a796ba49a5bd9debaa32f8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:GHMVNOBHE3CZVUIMU3YMNSIUGI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Distribution of Alpha Elements in Ultra-Faint Dwarf Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"(2) UC Irvine, (3) Carnegie Observatories), Evan N. Kirby (2), Joshua D. Simon (3) ((1) Yale University, Luis C. Vargas (1), Marla Geha (1)","submitted_at":"2013-02-26T21:00:06Z","abstract_excerpt":"The Milky Way ultra-faint dwarf galaxies (UFDs) contain some of the oldest, most metal-poor stars in the Universe. We present [Mg/Fe], [Si/Fe], [Ca/Fe], [Ti/Fe], and mean [alpha/Fe], abundance ratios for 61 individual red giant branch stars across 8 UFDs. This is the largest sample of alpha abundances published to date in galaxies with absolute magnitudes M_V > -8, including the first measurements for Segue 1, Canes Venatici II, Ursa Major I, and Leo T. Abundances were determined via medium-resolution Keck/DEIMOS spectroscopy and spectral synthesis. The sample spans the metallicity range -3.4 "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.6594","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":"2026-05-18T01:51:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aRXBjY3mGqgv6Xjs/SYuV1kMqEBtCM38cXnyIJosjLjkrPVtIpxmCf6MyCgY8Xu+HWAVWXy/ocma43D2u8ipCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T12:31:27.131483Z"},"content_sha256":"ce7301a227424311d500c79d61a9e1d11b697c5087a42921ae20f5093275f68d","schema_version":"1.0","event_id":"sha256:ce7301a227424311d500c79d61a9e1d11b697c5087a42921ae20f5093275f68d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GHMVNOBHE3CZVUIMU3YMNSIUGI/bundle.json","state_url":"https://pith.science/pith/GHMVNOBHE3CZVUIMU3YMNSIUGI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GHMVNOBHE3CZVUIMU3YMNSIUGI/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":"2026-06-10T12:31:27Z","links":{"resolver":"https://pith.science/pith/GHMVNOBHE3CZVUIMU3YMNSIUGI","bundle":"https://pith.science/pith/GHMVNOBHE3CZVUIMU3YMNSIUGI/bundle.json","state":"https://pith.science/pith/GHMVNOBHE3CZVUIMU3YMNSIUGI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GHMVNOBHE3CZVUIMU3YMNSIUGI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:GHMVNOBHE3CZVUIMU3YMNSIUGI","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":"a829fa447612c365f6a5a3c0dfd2fafd672ac7abefd1e5967b6e0f8af4582a81","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-26T21:00:06Z","title_canon_sha256":"bc951430cd54fa6ad6167f9c25319ac16e331bb7b3d0352e48e59857b58b62ea"},"schema_version":"1.0","source":{"id":"1302.6594","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.6594","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"arxiv_version","alias_value":"1302.6594v1","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.6594","created_at":"2026-05-18T01:51:27Z"},{"alias_kind":"pith_short_12","alias_value":"GHMVNOBHE3CZ","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"GHMVNOBHE3CZVUIM","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"GHMVNOBH","created_at":"2026-05-18T12:27:45Z"}],"graph_snapshots":[{"event_id":"sha256:ce7301a227424311d500c79d61a9e1d11b697c5087a42921ae20f5093275f68d","target":"graph","created_at":"2026-05-18T01:51:27Z","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":"The Milky Way ultra-faint dwarf galaxies (UFDs) contain some of the oldest, most metal-poor stars in the Universe. We present [Mg/Fe], [Si/Fe], [Ca/Fe], [Ti/Fe], and mean [alpha/Fe], abundance ratios for 61 individual red giant branch stars across 8 UFDs. This is the largest sample of alpha abundances published to date in galaxies with absolute magnitudes M_V > -8, including the first measurements for Segue 1, Canes Venatici II, Ursa Major I, and Leo T. Abundances were determined via medium-resolution Keck/DEIMOS spectroscopy and spectral synthesis. The sample spans the metallicity range -3.4 ","authors_text":"(2) UC Irvine, (3) Carnegie Observatories), Evan N. Kirby (2), Joshua D. Simon (3) ((1) Yale University, Luis C. Vargas (1), Marla Geha (1)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-26T21:00:06Z","title":"The Distribution of Alpha Elements in Ultra-Faint Dwarf Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.6594","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":"sha256:2704e4506518273a6e9a87b17ad8843632af8229d7a796ba49a5bd9debaa32f8","target":"record","created_at":"2026-05-18T01:51:27Z","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":"a829fa447612c365f6a5a3c0dfd2fafd672ac7abefd1e5967b6e0f8af4582a81","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-26T21:00:06Z","title_canon_sha256":"bc951430cd54fa6ad6167f9c25319ac16e331bb7b3d0352e48e59857b58b62ea"},"schema_version":"1.0","source":{"id":"1302.6594","kind":"arxiv","version":1}},"canonical_sha256":"31d956b82726c59ad10ca6f0c6c914323788894230832849f3a05b0e83ce4d1a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"31d956b82726c59ad10ca6f0c6c914323788894230832849f3a05b0e83ce4d1a","first_computed_at":"2026-05-18T01:51:27.073130Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:51:27.073130Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Uu9UgNHjputOO587b/qjPMHGBMZr0LqmFo6Fr6QgP58hLofIufG3m5PZmdpEpdh4ZwJz2Db0Fco/GvC0zTuMCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:51:27.073769Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.6594","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2704e4506518273a6e9a87b17ad8843632af8229d7a796ba49a5bd9debaa32f8","sha256:ce7301a227424311d500c79d61a9e1d11b697c5087a42921ae20f5093275f68d"],"state_sha256":"32a303168f2a641caed22b696f5cf9e2197f40b385d1c2cc86e9fc8718e0fb27"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sMq/DCLKzjBfrcHmMVXAJJkAwi+oz1KF5cbTgf6btnWNNEOUNfteOZIZaK4MDl6KhCXmJJe3leV97ZqF8liXAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T12:31:27.135494Z","bundle_sha256":"79d9c84e31aa90c469e4a85bf43bb2a00238d0e06e9a97e575c2a153432dfe5b"}}