{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:OZ7RVTYWLEDRG35Y5DWHYMUGIQ","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":"8a584308de7d946e3048630907c924e32bc6557a65e8d19e4e17492f6de61127","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-16T20:00:15Z","title_canon_sha256":"04f66a90be9f06634ac309224fed1c3942a85ae8b1e4877ceceb463eff2d7c17"},"schema_version":"1.0","source":{"id":"1605.04919","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.04919","created_at":"2026-05-18T01:02:04Z"},{"alias_kind":"arxiv_version","alias_value":"1605.04919v2","created_at":"2026-05-18T01:02:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.04919","created_at":"2026-05-18T01:02:04Z"},{"alias_kind":"pith_short_12","alias_value":"OZ7RVTYWLEDR","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OZ7RVTYWLEDRG35Y","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OZ7RVTYW","created_at":"2026-05-18T12:30:36Z"}],"graph_snapshots":[{"event_id":"sha256:2944b45b52aa0f544eb790cb2d4ec39ce68e52d0e8a707448b8e7ae7cc8fdf4c","target":"graph","created_at":"2026-05-18T01:02:04Z","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":"Star-forming galaxies form a sequence in the [OIII]/H-beta vs. [NII]/H-alpha diagnostic diagram, with low metallicity, highly ionized galaxies falling in the upper left corner. Drawing from a large sample of UV-selected star-forming galaxies at z~2 with rest-frame optical nebular emission line measurements from Keck-MOSFIRE, we select the extreme ~5% of the galaxies lying in this upper left corner, requiring log([NII]/H-alpha) <= 1.1 and log([OIII]/H-beta) >= 0.75. These cuts identify galaxies with 12 + log(O/H) <~ 8.0, when oxygen abundances are measured via the O3N2 diagnostic. We study the ","authors_text":"Alice E. Shapley, Allison L. Strom, Charles C. Steidel, Dawn K. Erb, Gwen C. Rudie, Max Pettini, Naveen A. Reddy, Ryan F. Trainor","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-16T20:00:15Z","title":"A High Fraction of Ly-alpha-Emitters Among Galaxies with Extreme Emission Line Ratios at z ~ 2"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.04919","kind":"arxiv","version":2},"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:af15f002ea9fc82dd237148221fa4fd37df78ed5fed51bd046ee815ef1155314","target":"record","created_at":"2026-05-18T01:02:04Z","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":"8a584308de7d946e3048630907c924e32bc6557a65e8d19e4e17492f6de61127","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-16T20:00:15Z","title_canon_sha256":"04f66a90be9f06634ac309224fed1c3942a85ae8b1e4877ceceb463eff2d7c17"},"schema_version":"1.0","source":{"id":"1605.04919","kind":"arxiv","version":2}},"canonical_sha256":"767f1acf165907136fb8e8ec7c3286441dfe97bb0d34643ef359ac76959a0ae2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"767f1acf165907136fb8e8ec7c3286441dfe97bb0d34643ef359ac76959a0ae2","first_computed_at":"2026-05-18T01:02:04.241767Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:02:04.241767Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4R7TvCsyl0NiOarkmMPtOpCj+8nGByrUc2+DYemnjl2cqDt6E2ohz+Yg4yWhQNlgLtyfOb4t/vhbZW9NEnxBCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:02:04.243074Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.04919","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:af15f002ea9fc82dd237148221fa4fd37df78ed5fed51bd046ee815ef1155314","sha256:2944b45b52aa0f544eb790cb2d4ec39ce68e52d0e8a707448b8e7ae7cc8fdf4c"],"state_sha256":"19f2bc46a8fc8e86fba164d5141e93600ca64ae75d3998c1c32eafb8c98f6de7"}