{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:R4J3V5PEDZMK6735VWVTDACSY5","short_pith_number":"pith:R4J3V5PE","schema_version":"1.0","canonical_sha256":"8f13baf5e41e58af7f7dadab318052c747767d2d7d3a500cc23e2c8d0b2183c5","source":{"kind":"arxiv","id":"1707.08731","version":1},"attestation_state":"computed","paper":{"title":"Active Galactic Nuclei with a Low-Metallicity Narrow-Line Region","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Kenta Matsuoka, Koki Terao, Kota Kawasaki, Tohru Nagao, Yoshiki Toba","submitted_at":"2017-07-27T07:33:56Z","abstract_excerpt":"Low-metallicity active galactic nuclei (AGNs) are interesting to study the early phase of the AGN evolution. However most AGNs are chemically matured and accordingly low-metallicity AGNs are extremely rare. One approach to search for low-metallicity AGNs systematically is utilizing the so-called BPT diagram that consists of the [O III]$\\lambda$5007/H$\\beta$$\\lambda4861$ and [N II]$\\lambda6584$/H$\\alpha$$\\lambda6563$ flux ratios. Specifically, photoionization models predict that low-metallicity AGNs show a high [O III]$\\lambda$5007/H$\\beta$$\\lambda$4861 ratio and a relatively low [N II]$\\lambda"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1707.08731","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-07-27T07:33:56Z","cross_cats_sorted":[],"title_canon_sha256":"3efe0dbb16a1b8212ea3667276ab2ce8d8911c8473952d4edacaaf577a856054","abstract_canon_sha256":"272c87aacff893cb3cdcb63c76a67e17cc8361ffac33056f735a9f32cd3e2082"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:39:22.101726Z","signature_b64":"su/uXSjCnWFP/NAL4T2dRd4c1JbCeQj15ufRxZcX5BDf7vn8oCiSmEoKKl3tPyHGkRV8bGzcEff7GJndaodxAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8f13baf5e41e58af7f7dadab318052c747767d2d7d3a500cc23e2c8d0b2183c5","last_reissued_at":"2026-05-18T00:39:22.101032Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:39:22.101032Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Active Galactic Nuclei with a Low-Metallicity Narrow-Line Region","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Kenta Matsuoka, Koki Terao, Kota Kawasaki, Tohru Nagao, Yoshiki Toba","submitted_at":"2017-07-27T07:33:56Z","abstract_excerpt":"Low-metallicity active galactic nuclei (AGNs) are interesting to study the early phase of the AGN evolution. However most AGNs are chemically matured and accordingly low-metallicity AGNs are extremely rare. One approach to search for low-metallicity AGNs systematically is utilizing the so-called BPT diagram that consists of the [O III]$\\lambda$5007/H$\\beta$$\\lambda4861$ and [N II]$\\lambda6584$/H$\\alpha$$\\lambda6563$ flux ratios. Specifically, photoionization models predict that low-metallicity AGNs show a high [O III]$\\lambda$5007/H$\\beta$$\\lambda$4861 ratio and a relatively low [N II]$\\lambda"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.08731","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1707.08731","created_at":"2026-05-18T00:39:22.101134+00:00"},{"alias_kind":"arxiv_version","alias_value":"1707.08731v1","created_at":"2026-05-18T00:39:22.101134+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.08731","created_at":"2026-05-18T00:39:22.101134+00:00"},{"alias_kind":"pith_short_12","alias_value":"R4J3V5PEDZMK","created_at":"2026-05-18T12:31:39.905425+00:00"},{"alias_kind":"pith_short_16","alias_value":"R4J3V5PEDZMK6735","created_at":"2026-05-18T12:31:39.905425+00:00"},{"alias_kind":"pith_short_8","alias_value":"R4J3V5PE","created_at":"2026-05-18T12:31:39.905425+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/R4J3V5PEDZMK6735VWVTDACSY5","json":"https://pith.science/pith/R4J3V5PEDZMK6735VWVTDACSY5.json","graph_json":"https://pith.science/api/pith-number/R4J3V5PEDZMK6735VWVTDACSY5/graph.json","events_json":"https://pith.science/api/pith-number/R4J3V5PEDZMK6735VWVTDACSY5/events.json","paper":"https://pith.science/paper/R4J3V5PE"},"agent_actions":{"view_html":"https://pith.science/pith/R4J3V5PEDZMK6735VWVTDACSY5","download_json":"https://pith.science/pith/R4J3V5PEDZMK6735VWVTDACSY5.json","view_paper":"https://pith.science/paper/R4J3V5PE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1707.08731&json=true","fetch_graph":"https://pith.science/api/pith-number/R4J3V5PEDZMK6735VWVTDACSY5/graph.json","fetch_events":"https://pith.science/api/pith-number/R4J3V5PEDZMK6735VWVTDACSY5/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/R4J3V5PEDZMK6735VWVTDACSY5/action/timestamp_anchor","attest_storage":"https://pith.science/pith/R4J3V5PEDZMK6735VWVTDACSY5/action/storage_attestation","attest_author":"https://pith.science/pith/R4J3V5PEDZMK6735VWVTDACSY5/action/author_attestation","sign_citation":"https://pith.science/pith/R4J3V5PEDZMK6735VWVTDACSY5/action/citation_signature","submit_replication":"https://pith.science/pith/R4J3V5PEDZMK6735VWVTDACSY5/action/replication_record"}},"created_at":"2026-05-18T00:39:22.101134+00:00","updated_at":"2026-05-18T00:39:22.101134+00:00"}