{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:I5O762M6OH3DES5SIIRWIDYTOD","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":"60ff752abf8a4b30ba6cd90808afcb6cce7049d4a86176800ab034439a2f3e0a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-02-02T19:49:48Z","title_canon_sha256":"450b7d87f4e8a646c468604d911901496bed820a2156cb9326f28874f3af0977"},"schema_version":"1.0","source":{"id":"0902.0336","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0902.0336","created_at":"2026-05-18T04:29:16Z"},{"alias_kind":"arxiv_version","alias_value":"0902.0336v1","created_at":"2026-05-18T04:29:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0902.0336","created_at":"2026-05-18T04:29:16Z"},{"alias_kind":"pith_short_12","alias_value":"I5O762M6OH3D","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"I5O762M6OH3DES5S","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"I5O762M6","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:1043cb4c658b19c7786c64f8845c71f1313f7e1cfe9de3dabf683b8a35e21cb0","target":"graph","created_at":"2026-05-18T04:29:16Z","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":"Ultra strong emission-line galaxies (USELs) with extremely high equivalent widths (EW(H beta) > 30A) can be used to pick out galaxies of extremely low metallicity in the z=0-1 redshift range. Large numbers of these objects are easily detected in deep narrow band searches and, since most have detectable [OIII] 4363, their metallicities determined using the direct method. These large samples hold the possibility for determining if there is a metallicity floor for the galaxy population. Here we describe results of an extensive spectroscopic follow-up of the Kakazu et al. (2007) catalog of 542 USE","authors_text":"Amy J. Barger, Esther M. Hu, Lennox L. Cowie, Yuko Kakazu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-02-02T19:49:48Z","title":"Deep Spectroscopy of Ultra-Strong Emission Line Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0902.0336","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:dbe77280c8b482d983c7191c285b7f8cea9f353d8edfa12ac6ded742cf7457a0","target":"record","created_at":"2026-05-18T04:29:16Z","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":"60ff752abf8a4b30ba6cd90808afcb6cce7049d4a86176800ab034439a2f3e0a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-02-02T19:49:48Z","title_canon_sha256":"450b7d87f4e8a646c468604d911901496bed820a2156cb9326f28874f3af0977"},"schema_version":"1.0","source":{"id":"0902.0336","kind":"arxiv","version":1}},"canonical_sha256":"475dff699e71f6324bb24223640f1370dc74d4aaf6129bdb584398c96b4fb28d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"475dff699e71f6324bb24223640f1370dc74d4aaf6129bdb584398c96b4fb28d","first_computed_at":"2026-05-18T04:29:16.909476Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:16.909476Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"avr+Dj7GiujtTn1z+S/Qk3ANZXUz6VgG3K7W/ZvZtT5vTXKCFhwQ8d4mJzxgFBb6cuhUl7D6gSp2p+6Dwf75Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:16.909896Z","signed_message":"canonical_sha256_bytes"},"source_id":"0902.0336","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dbe77280c8b482d983c7191c285b7f8cea9f353d8edfa12ac6ded742cf7457a0","sha256:1043cb4c658b19c7786c64f8845c71f1313f7e1cfe9de3dabf683b8a35e21cb0"],"state_sha256":"e4b448b5ce4d3986600a977d52872254d0bbc8029373ee37d186d5548fc0f981"}