{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:2V7AKCT5EC5DZD7KYBZHNVDAF7","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":"598de5aa77b8fdf1320ea23dcaa2af4d04fd33bbfac75525b3347745e15999fd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-11-18T10:09:12Z","title_canon_sha256":"603765ec37da66e35f696e48b792a346cfa0cf1158847a1df5b86d3b8aef6077"},"schema_version":"1.0","source":{"id":"1611.06027","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.06027","created_at":"2026-05-18T00:52:37Z"},{"alias_kind":"arxiv_version","alias_value":"1611.06027v1","created_at":"2026-05-18T00:52:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.06027","created_at":"2026-05-18T00:52:37Z"},{"alias_kind":"pith_short_12","alias_value":"2V7AKCT5EC5D","created_at":"2026-05-18T12:29:55Z"},{"alias_kind":"pith_short_16","alias_value":"2V7AKCT5EC5DZD7K","created_at":"2026-05-18T12:29:55Z"},{"alias_kind":"pith_short_8","alias_value":"2V7AKCT5","created_at":"2026-05-18T12:29:55Z"}],"graph_snapshots":[{"event_id":"sha256:8ce63a0effa57848a404a4b5290c5f5077fea11778230fe60561c3ece86167a4","target":"graph","created_at":"2026-05-18T00:52:37Z","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 an analysis of Mg II $\\lambda2798$ and Fe II UV emission lines for archival Sloan Digital Sky Survey (SDSS) quasars to explore diagnostics of the magnesium-to-iron abundance ratio in a broad-line region cloud. Our sample consists of 17,432 quasars selected from the SDSS Data Release 7 with a redshift range of $0.72 < z < 1.63$. A strong anticorrelation between Mg II equivalent width (EW) and the Eddington ratio is found, while only a weak positive correlation is found between Fe II EW and the Eddington ratio. To investigate the origin of these differing behaviors of Mg II and Fe II ","authors_text":"Hiroaki Sameshima, Kimiaki Kawara, Yuzuru Yoshii","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-11-18T10:09:12Z","title":"Chemical evolution of the Universe at 0.7 < z < 1.6 derived from abundance diagnostics of the broad-line region of quasars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.06027","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:e1355cce7f586fd76244b6a8565a319e30379abed0fe9c2d91e56027443cfcba","target":"record","created_at":"2026-05-18T00:52:37Z","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":"598de5aa77b8fdf1320ea23dcaa2af4d04fd33bbfac75525b3347745e15999fd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-11-18T10:09:12Z","title_canon_sha256":"603765ec37da66e35f696e48b792a346cfa0cf1158847a1df5b86d3b8aef6077"},"schema_version":"1.0","source":{"id":"1611.06027","kind":"arxiv","version":1}},"canonical_sha256":"d57e050a7d20ba3c8feac07276d4602fcde04e9c615c8dcf2ddd3122fc66a38d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d57e050a7d20ba3c8feac07276d4602fcde04e9c615c8dcf2ddd3122fc66a38d","first_computed_at":"2026-05-18T00:52:37.808285Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:37.808285Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0N0SDdy7bqpLrEdLUbhx6XWfpK36KCNkX2XMWS6WKs2Xj0Ce1apgVryv1XYYtQq7SrlMESCUObs9kr3wsCdDDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:37.808802Z","signed_message":"canonical_sha256_bytes"},"source_id":"1611.06027","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e1355cce7f586fd76244b6a8565a319e30379abed0fe9c2d91e56027443cfcba","sha256:8ce63a0effa57848a404a4b5290c5f5077fea11778230fe60561c3ece86167a4"],"state_sha256":"3368a94d9b7517b75cc879d38cda79d24aa72615d70f4a6295602352af09532a"}