{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2005:X25UL2FDQ4MESWWKBV2J22EPGJ","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":"6804353c6277cb0c026e7d1c7ed9ee59ae0b5ea2bbf8c0b671023a32daf029ba","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-05-19T09:53:43Z","title_canon_sha256":"bbad3aa13a38165f894bf70df9a811ad6b89508ec6854bf0c312e86d8fe4c32a"},"schema_version":"1.0","source":{"id":"astro-ph/0505399","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0505399","created_at":"2026-07-04T16:52:24Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0505399v1","created_at":"2026-07-04T16:52:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0505399","created_at":"2026-07-04T16:52:24Z"},{"alias_kind":"pith_short_12","alias_value":"X25UL2FDQ4ME","created_at":"2026-07-04T16:52:24Z"},{"alias_kind":"pith_short_16","alias_value":"X25UL2FDQ4MESWWK","created_at":"2026-07-04T16:52:24Z"},{"alias_kind":"pith_short_8","alias_value":"X25UL2FD","created_at":"2026-07-04T16:52:24Z"}],"graph_snapshots":[{"event_id":"sha256:44b18bb0c0b2c34407e1ef2bc9c3806464520f84f2c63d66e34155e595c2587d","target":"graph","created_at":"2026-07-04T16:52:24Z","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/0505399/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We have obtained deep color-magnitude diagrams of the Sagittarius dwarf irregular galaxy with the HST/ACS. The new diagrams unveil for the first time the star formation history of SagDIG.\n  We identify a small population of red horizontal branch stars, which sets the first epoch of star formation in SagDIG back to ~9-10 Gyr ago. This shows that SagDIG has been able to maintain a very low mean metallicity (-2.2<[Fe/H]<-1.9) over a 10 Gyr life time, and most importantly, that all Local Group dwarf galaxies share an ancient (~10 Gyr) initial episode of star formation. Thus, at the moment, IZw18 r","authors_text":"E.V. Held, I. Saviane, K. Kuijken, L. Rizzi, M. Clemens, M. Gullieuszik, M. Rich, Rolly Bedin, Y. Momany","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2005-05-19T09:53:43Z","title":"HST/ACS observations of the old and metal-poor Sagittarius dwarf irregular galaxy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0505399","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":"sha256:582c5ab806240c3f6831be042120a46e63e2259f7dc03cf3dde489e88cb4a4b8","target":"record","created_at":"2026-07-04T16:52:24Z","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":"6804353c6277cb0c026e7d1c7ed9ee59ae0b5ea2bbf8c0b671023a32daf029ba","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-05-19T09:53:43Z","title_canon_sha256":"bbad3aa13a38165f894bf70df9a811ad6b89508ec6854bf0c312e86d8fe4c32a"},"schema_version":"1.0","source":{"id":"astro-ph/0505399","kind":"arxiv","version":1}},"canonical_sha256":"bebb45e8a38718495aca0d749d688f326d9479cd68b87d1431cee1acf139b3b7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bebb45e8a38718495aca0d749d688f326d9479cd68b87d1431cee1acf139b3b7","first_computed_at":"2026-07-04T16:52:24.737670Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:52:24.737670Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JgXTmiC91017gGUVBGNaJ9qcAvlQsYFxaCsAfdMg2UfcORXCZDU9WBKB2/PU7rBnf+mBisNFUJ1k4vz665mcDg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:52:24.738058Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0505399","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:582c5ab806240c3f6831be042120a46e63e2259f7dc03cf3dde489e88cb4a4b8","sha256:44b18bb0c0b2c34407e1ef2bc9c3806464520f84f2c63d66e34155e595c2587d"],"state_sha256":"602e3d4c26f5f9312a9c1c147a40a5ee81112f7f0fe28cc5425115e3e12b3ef7"}