{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:VSPKH4TSGAHI5HA624HG2NI4V6","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":"83c25ff03428eb70124e918a88253cce5e3d604a8fe4470e12c78da458a776d3","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-04-08T14:03:54Z","title_canon_sha256":"da6d60e32d63a316e678fe6f26b7a114d9232199b4df8cc5fe4ebda66ec92a91"},"schema_version":"1.0","source":{"id":"1004.1342","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1004.1342","created_at":"2026-05-18T02:08:07Z"},{"alias_kind":"arxiv_version","alias_value":"1004.1342v1","created_at":"2026-05-18T02:08:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1004.1342","created_at":"2026-05-18T02:08:07Z"},{"alias_kind":"pith_short_12","alias_value":"VSPKH4TSGAHI","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"VSPKH4TSGAHI5HA6","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"VSPKH4TS","created_at":"2026-05-18T12:26:15Z"}],"graph_snapshots":[{"event_id":"sha256:5dbd89bcfc320a011ba5e6d5be9cea14d2053ecec4414ad0faff80ba50fdf3eb","target":"graph","created_at":"2026-05-18T02:08:07Z","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 present optical emission-line spectra for outlying HII regions in the extended neutral gas disk surrounding the blue compact dwarf galaxy NGC 2915. Using a combination of strong-line R23 and direct oxygen abundance measurements, we report a flat, possibly increasing,  metallicity gradient out to 1.2 times the Holmberg radius. We find the outer-disk of NGC 2915 to be enriched to a metallicity of 0.4 Z_solar.  An analysis of the metal yields shows that the outer disk of NGC 2915 is overabundant for its gas fraction, while the central star-foming core is similarly under-abundant for its gas fr","authors_text":"Andrey V. Kravtsov, David A. Thilker, Gerhardt R. Meurer, Jessica K. Werk, Joss Bland-Hawthorn, Kenneth C. Freeman, Mary E. Putman, Ronald J. Allen","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-04-08T14:03:54Z","title":"The Metal-Enriched Outer Disk of NGC 2915"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.1342","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:d41064f6f87511fdc8b32d4dd2db62f70cec7e048fdf17ed4ad6063115b13b7f","target":"record","created_at":"2026-05-18T02:08:07Z","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":"83c25ff03428eb70124e918a88253cce5e3d604a8fe4470e12c78da458a776d3","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-04-08T14:03:54Z","title_canon_sha256":"da6d60e32d63a316e678fe6f26b7a114d9232199b4df8cc5fe4ebda66ec92a91"},"schema_version":"1.0","source":{"id":"1004.1342","kind":"arxiv","version":1}},"canonical_sha256":"ac9ea3f272300e8e9c1ed70e6d351caf86f9f4694e3a4bc59bf36edcfa060092","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ac9ea3f272300e8e9c1ed70e6d351caf86f9f4694e3a4bc59bf36edcfa060092","first_computed_at":"2026-05-18T02:08:07.896537Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:08:07.896537Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"H7u7ntzW37SnYjnTlvTcEgYJMi9kGykf3DRIEjvw4qvWJGKNNVJSWQgTyyU4gUvWwx6JlFjklTPhdiBqgvnnBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:08:07.897344Z","signed_message":"canonical_sha256_bytes"},"source_id":"1004.1342","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d41064f6f87511fdc8b32d4dd2db62f70cec7e048fdf17ed4ad6063115b13b7f","sha256:5dbd89bcfc320a011ba5e6d5be9cea14d2053ecec4414ad0faff80ba50fdf3eb"],"state_sha256":"370693dbc03298f95a54b135a78fcce5bc29c664123f740548454fc292c37178"}