{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:UC2WOXUUBTCS2WNC7B3GTMQTDW","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":"3edcb124321823a74da9ea02f72c4bdf3e1e7c127923906e000066fe29084acf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-02T20:29:35Z","title_canon_sha256":"a15b158ab1a592878a31e242c72682a2abc0d29a15f6fd3a35a547d951e7b500"},"schema_version":"1.0","source":{"id":"1011.0750","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1011.0750","created_at":"2026-05-18T02:04:53Z"},{"alias_kind":"arxiv_version","alias_value":"1011.0750v2","created_at":"2026-05-18T02:04:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.0750","created_at":"2026-05-18T02:04:53Z"},{"alias_kind":"pith_short_12","alias_value":"UC2WOXUUBTCS","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"UC2WOXUUBTCS2WNC","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"UC2WOXUU","created_at":"2026-05-18T12:26:15Z"}],"graph_snapshots":[{"event_id":"sha256:058e62f9b1709f918f5ee6b36a1ec9ebac945ca8b9540e8b271b977c9d28eb02","target":"graph","created_at":"2026-05-18T02:04:53Z","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 identified 24 SiIV absorption systems with z <~ 1 from a blind survey of 49 low-redshift quasars with archival Hubble Space Telescope ultraviolet spectra. We relied solely on the characteristic wavelength separation of the doublet to automatically detect candidates. After visual inspection, we defined a sample of 20 definite (group G = 1) and 4 \"highly-likely\" (G = 2) doublets with rest equivalent widths W_r for both lines detected at > 3 sigma. The absorber line density of the G = 1 doublets was dN_SiIV/dX = 1.4+0.4/-0.3 for log N(Si+3) > 12.9. The best-fit power law to the G = 1 frequency","authors_text":"(2) UC Santa Cruz, (3) STScI, (4) U Chicago), Christopher Thom (3), Hsiao-Wen Chen (4) ((1) MIT Kavli Institute for Astrophysics, J. Xavier Prochaska (2), Kathy L Cooksey (1), Space Research, UCO/Lick Observatory","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-02T20:29:35Z","title":"The Last Eight-Billion Years of Intergalactic SiIV Evolution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.0750","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":"sha256:0f86fd63f5ed1238a7b563874220fa4e0ed0f8ac53b64232054ed3cf636c23d8","target":"record","created_at":"2026-05-18T02:04:53Z","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":"3edcb124321823a74da9ea02f72c4bdf3e1e7c127923906e000066fe29084acf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-11-02T20:29:35Z","title_canon_sha256":"a15b158ab1a592878a31e242c72682a2abc0d29a15f6fd3a35a547d951e7b500"},"schema_version":"1.0","source":{"id":"1011.0750","kind":"arxiv","version":2}},"canonical_sha256":"a0b5675e940cc52d59a2f87669b2131d81f293be839e709e0fdcc7acd082e368","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a0b5675e940cc52d59a2f87669b2131d81f293be839e709e0fdcc7acd082e368","first_computed_at":"2026-05-18T02:04:53.474228Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:04:53.474228Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ljegjlf0J4OskhLoUN7SaOETz/zSdYTqzGhgA5awgrOjU/ibkMmWC+8I/UqBDodVgg+hgDP+bgU+I7LJYoBYCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:04:53.474862Z","signed_message":"canonical_sha256_bytes"},"source_id":"1011.0750","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0f86fd63f5ed1238a7b563874220fa4e0ed0f8ac53b64232054ed3cf636c23d8","sha256:058e62f9b1709f918f5ee6b36a1ec9ebac945ca8b9540e8b271b977c9d28eb02"],"state_sha256":"b5c2bfef955a1c655d8bc6bb5c4e0f045d5ca7a18fd831fe66b43cb71067afc1"}