{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:KNAIXBTFDLPFDNEZZOJBNYKCUL","short_pith_number":"pith:KNAIXBTF","schema_version":"1.0","canonical_sha256":"53408b86651ade51b499cb9216e142a2ed5e84e4539e3bfd0ed2f7df960c001b","source":{"kind":"arxiv","id":"1310.6402","version":1},"attestation_state":"computed","paper":{"title":"Interpreting the Ionization Sequence in AGN Emission-Line Spectra","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Chris T. Richardson, Gary J. Ferland, Jack A. Baldwin, James T. Allen, Paul C. Hewett","submitted_at":"2013-10-23T21:48:33Z","abstract_excerpt":"We investigate the physical cause of the great range in the ionization level seen in the spectra of narrow lined active galactic nuclei (AGN). Mean field independent component analysis identifies examples of individual SDSS galaxies whose spectra are not dominated by emission due to star formation (SF), which we designate as AGN. We assembled high S/N ratio composite spectra of a sequence of these AGN defined by the ionization level of their narrow-line regions (NLR), extending down to very low-ionization cases. We used a local optimally emitting cloud (LOC) model to fit emission-line ratios i"},"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":"1310.6402","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-10-23T21:48:33Z","cross_cats_sorted":[],"title_canon_sha256":"51a5711715028fd9810020b601d2148aed344d7a5b1d5e5601765cf6ec59eef9","abstract_canon_sha256":"ecf7a982935dcafa185f0a078737d5e226a6d6c594198c0b1bd23226ceecdd3c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:46:50.409337Z","signature_b64":"rdWiV0TYjYQtHF3lHIdaKtofv/5//uKgzIJ8fSklX9+WuNCDAtSRfgaK3lRp6yp6Khuy7pZuFEaU3sHwjH8ZAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"53408b86651ade51b499cb9216e142a2ed5e84e4539e3bfd0ed2f7df960c001b","last_reissued_at":"2026-05-18T01:46:50.408688Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:46:50.408688Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Interpreting the Ionization Sequence in AGN Emission-Line Spectra","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Chris T. Richardson, Gary J. Ferland, Jack A. Baldwin, James T. Allen, Paul C. Hewett","submitted_at":"2013-10-23T21:48:33Z","abstract_excerpt":"We investigate the physical cause of the great range in the ionization level seen in the spectra of narrow lined active galactic nuclei (AGN). Mean field independent component analysis identifies examples of individual SDSS galaxies whose spectra are not dominated by emission due to star formation (SF), which we designate as AGN. We assembled high S/N ratio composite spectra of a sequence of these AGN defined by the ionization level of their narrow-line regions (NLR), extending down to very low-ionization cases. We used a local optimally emitting cloud (LOC) model to fit emission-line ratios i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.6402","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":"1310.6402","created_at":"2026-05-18T01:46:50.408782+00:00"},{"alias_kind":"arxiv_version","alias_value":"1310.6402v1","created_at":"2026-05-18T01:46:50.408782+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.6402","created_at":"2026-05-18T01:46:50.408782+00:00"},{"alias_kind":"pith_short_12","alias_value":"KNAIXBTFDLPF","created_at":"2026-05-18T12:27:51.066281+00:00"},{"alias_kind":"pith_short_16","alias_value":"KNAIXBTFDLPFDNEZ","created_at":"2026-05-18T12:27:51.066281+00:00"},{"alias_kind":"pith_short_8","alias_value":"KNAIXBTF","created_at":"2026-05-18T12:27:51.066281+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/KNAIXBTFDLPFDNEZZOJBNYKCUL","json":"https://pith.science/pith/KNAIXBTFDLPFDNEZZOJBNYKCUL.json","graph_json":"https://pith.science/api/pith-number/KNAIXBTFDLPFDNEZZOJBNYKCUL/graph.json","events_json":"https://pith.science/api/pith-number/KNAIXBTFDLPFDNEZZOJBNYKCUL/events.json","paper":"https://pith.science/paper/KNAIXBTF"},"agent_actions":{"view_html":"https://pith.science/pith/KNAIXBTFDLPFDNEZZOJBNYKCUL","download_json":"https://pith.science/pith/KNAIXBTFDLPFDNEZZOJBNYKCUL.json","view_paper":"https://pith.science/paper/KNAIXBTF","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1310.6402&json=true","fetch_graph":"https://pith.science/api/pith-number/KNAIXBTFDLPFDNEZZOJBNYKCUL/graph.json","fetch_events":"https://pith.science/api/pith-number/KNAIXBTFDLPFDNEZZOJBNYKCUL/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/KNAIXBTFDLPFDNEZZOJBNYKCUL/action/timestamp_anchor","attest_storage":"https://pith.science/pith/KNAIXBTFDLPFDNEZZOJBNYKCUL/action/storage_attestation","attest_author":"https://pith.science/pith/KNAIXBTFDLPFDNEZZOJBNYKCUL/action/author_attestation","sign_citation":"https://pith.science/pith/KNAIXBTFDLPFDNEZZOJBNYKCUL/action/citation_signature","submit_replication":"https://pith.science/pith/KNAIXBTFDLPFDNEZZOJBNYKCUL/action/replication_record"}},"created_at":"2026-05-18T01:46:50.408782+00:00","updated_at":"2026-05-18T01:46:50.408782+00:00"}