{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2008:WB42HYL7TN45C3UQ6MLT5LVXCX","short_pith_number":"pith:WB42HYL7","schema_version":"1.0","canonical_sha256":"b079a3e17f9b79d16e90f3173eaeb715f314364820c75257409ecee08c33c3d6","source":{"kind":"arxiv","id":"0811.3714","version":2},"attestation_state":"computed","paper":{"title":"Probing Spectroscopic Variability of Galaxies & Narrow-Line Active Galactic Nuclei in the Sloan Digital Sky Survey","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Alex Szalay, Andrew Connolly, Ching-Wa Yip, Christy Tremonti, Daniel Vanden Berk, Istvan Csabai, Laszlo Dobos, Manuchehr Taghizadeh-Popp, Rosemary Wyse, Ryan Scranton, Simon Krughoff, Tamas Budavari, Zeljko Ivezic","submitted_at":"2008-11-24T15:48:43Z","abstract_excerpt":"Under the unified model for active galactic nuclei (AGNs), narrow-line (Type 2) AGNs are, in fact, broad-line (Type 1) AGNs but each with a heavily obscured accretion disk. We would therefore expect the optical continuum emission from Type 2 AGN to be composed mainly of stellar light and non-variable on the time-scales of months to years. In this work we probe the spectroscopic variability of galaxies and narrow-line AGNs using the multi-epoch data in the Sloan Digital Sky Survey (SDSS) Data Release 6. The sample contains 18,435 sources for which there exist pairs of spectroscopic observations"},"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":"0811.3714","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-11-24T15:48:43Z","cross_cats_sorted":[],"title_canon_sha256":"ca83a8b0a34df72f5f4fbbbd57999e03d3d7ed81ae094e5a340a68fb39ede495","abstract_canon_sha256":"3a0f560ee153bcb426bce7753d242893974369d9632157570511511487b1402c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:15:13.507120Z","signature_b64":"qWFwtaV/5D2Cv6pIXpt8bdSE8fAiLoZNHWVY2oMc0KPdnij6Zt3UYUL6JQnE5CiXrkgMX7IOKVG00JI8+cUeCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b079a3e17f9b79d16e90f3173eaeb715f314364820c75257409ecee08c33c3d6","last_reissued_at":"2026-05-18T02:15:13.506447Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:15:13.506447Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Probing Spectroscopic Variability of Galaxies & Narrow-Line Active Galactic Nuclei in the Sloan Digital Sky Survey","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Alex Szalay, Andrew Connolly, Ching-Wa Yip, Christy Tremonti, Daniel Vanden Berk, Istvan Csabai, Laszlo Dobos, Manuchehr Taghizadeh-Popp, Rosemary Wyse, Ryan Scranton, Simon Krughoff, Tamas Budavari, Zeljko Ivezic","submitted_at":"2008-11-24T15:48:43Z","abstract_excerpt":"Under the unified model for active galactic nuclei (AGNs), narrow-line (Type 2) AGNs are, in fact, broad-line (Type 1) AGNs but each with a heavily obscured accretion disk. We would therefore expect the optical continuum emission from Type 2 AGN to be composed mainly of stellar light and non-variable on the time-scales of months to years. In this work we probe the spectroscopic variability of galaxies and narrow-line AGNs using the multi-epoch data in the Sloan Digital Sky Survey (SDSS) Data Release 6. The sample contains 18,435 sources for which there exist pairs of spectroscopic observations"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0811.3714","kind":"arxiv","version":2},"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":"0811.3714","created_at":"2026-05-18T02:15:13.506549+00:00"},{"alias_kind":"arxiv_version","alias_value":"0811.3714v2","created_at":"2026-05-18T02:15:13.506549+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0811.3714","created_at":"2026-05-18T02:15:13.506549+00:00"},{"alias_kind":"pith_short_12","alias_value":"WB42HYL7TN45","created_at":"2026-05-18T12:25:58.018023+00:00"},{"alias_kind":"pith_short_16","alias_value":"WB42HYL7TN45C3UQ","created_at":"2026-05-18T12:25:58.018023+00:00"},{"alias_kind":"pith_short_8","alias_value":"WB42HYL7","created_at":"2026-05-18T12:25:58.018023+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/WB42HYL7TN45C3UQ6MLT5LVXCX","json":"https://pith.science/pith/WB42HYL7TN45C3UQ6MLT5LVXCX.json","graph_json":"https://pith.science/api/pith-number/WB42HYL7TN45C3UQ6MLT5LVXCX/graph.json","events_json":"https://pith.science/api/pith-number/WB42HYL7TN45C3UQ6MLT5LVXCX/events.json","paper":"https://pith.science/paper/WB42HYL7"},"agent_actions":{"view_html":"https://pith.science/pith/WB42HYL7TN45C3UQ6MLT5LVXCX","download_json":"https://pith.science/pith/WB42HYL7TN45C3UQ6MLT5LVXCX.json","view_paper":"https://pith.science/paper/WB42HYL7","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0811.3714&json=true","fetch_graph":"https://pith.science/api/pith-number/WB42HYL7TN45C3UQ6MLT5LVXCX/graph.json","fetch_events":"https://pith.science/api/pith-number/WB42HYL7TN45C3UQ6MLT5LVXCX/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/WB42HYL7TN45C3UQ6MLT5LVXCX/action/timestamp_anchor","attest_storage":"https://pith.science/pith/WB42HYL7TN45C3UQ6MLT5LVXCX/action/storage_attestation","attest_author":"https://pith.science/pith/WB42HYL7TN45C3UQ6MLT5LVXCX/action/author_attestation","sign_citation":"https://pith.science/pith/WB42HYL7TN45C3UQ6MLT5LVXCX/action/citation_signature","submit_replication":"https://pith.science/pith/WB42HYL7TN45C3UQ6MLT5LVXCX/action/replication_record"}},"created_at":"2026-05-18T02:15:13.506549+00:00","updated_at":"2026-05-18T02:15:13.506549+00:00"}