{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:1999:B7Z7ZI7UCMN7577Q2ENWKVU7MC","short_pith_number":"pith:B7Z7ZI7U","schema_version":"1.0","canonical_sha256":"0ff3fca3f4131bfefff0d11b65569f608cfae996b48448ca6a2331062e92433c","source":{"kind":"arxiv","id":"astro-ph/9910001","version":1},"attestation_state":"computed","paper":{"title":"The Discovery of a High-redshift Quasar without Emission Lines from Sloan Digital Sky Survey Commissioning Data","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"et al, SDSS Collaboration, Xiaohui Fan","submitted_at":"1999-10-01T00:19:26Z","abstract_excerpt":"We report observations of a luminous unresolved object at redshift z = 4.62, with a featureless optical spectrum redward of the Lyman alpha forest region, discovered from Sloan Digital Sky Survey (SDSS) commissioning data. The redshift is determined by the onset of the Lyman-alpha forest at lambda ~ 6800 A, and a Lyman Limit System at lambda = 5120 A. A strong Ly_alpha absorption system with weak metal absorption lines at z=4.58 is also identified in the spectrum. The object has a continuum absolute magnitude of -26.6 at 1450 A in the rest-frame (h_0=0.5, q_0=0.5), and therefore cannot be an o"},"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":"astro-ph/9910001","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-10-01T00:19:26Z","cross_cats_sorted":[],"title_canon_sha256":"5abc04d99eb936e6dadb44724b16301f11b826e65e66e8de7a26ca0e683ae67a","abstract_canon_sha256":"574a5420c2d7249341cfcb89b8d12d864184ff227ff942a245e91118708eea17"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:12.589138Z","signature_b64":"6w/Us2397I2LEG3SHL4gYC8L08zzI+HVkqW5NpfHdHn2/5/rtXp7EXj1RJc5BNUa/6e0A+ETNeKL3eiOzXTQAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0ff3fca3f4131bfefff0d11b65569f608cfae996b48448ca6a2331062e92433c","last_reissued_at":"2026-05-18T01:40:12.588417Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:12.588417Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Discovery of a High-redshift Quasar without Emission Lines from Sloan Digital Sky Survey Commissioning Data","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"et al, SDSS Collaboration, Xiaohui Fan","submitted_at":"1999-10-01T00:19:26Z","abstract_excerpt":"We report observations of a luminous unresolved object at redshift z = 4.62, with a featureless optical spectrum redward of the Lyman alpha forest region, discovered from Sloan Digital Sky Survey (SDSS) commissioning data. The redshift is determined by the onset of the Lyman-alpha forest at lambda ~ 6800 A, and a Lyman Limit System at lambda = 5120 A. A strong Ly_alpha absorption system with weak metal absorption lines at z=4.58 is also identified in the spectrum. The object has a continuum absolute magnitude of -26.6 at 1450 A in the rest-frame (h_0=0.5, q_0=0.5), and therefore cannot be an o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9910001","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":"astro-ph/9910001","created_at":"2026-05-18T01:40:12.588531+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9910001v1","created_at":"2026-05-18T01:40:12.588531+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9910001","created_at":"2026-05-18T01:40:12.588531+00:00"},{"alias_kind":"pith_short_12","alias_value":"B7Z7ZI7UCMN7","created_at":"2026-05-18T12:25:49.038998+00:00"},{"alias_kind":"pith_short_16","alias_value":"B7Z7ZI7UCMN7577Q","created_at":"2026-05-18T12:25:49.038998+00:00"},{"alias_kind":"pith_short_8","alias_value":"B7Z7ZI7U","created_at":"2026-05-18T12:25:49.038998+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2605.22918","citing_title":"Strong X-ray Variability of I Zwicky 1: Obscuration from Clumpy Accretion-Disk Winds","ref_index":154,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/B7Z7ZI7UCMN7577Q2ENWKVU7MC","json":"https://pith.science/pith/B7Z7ZI7UCMN7577Q2ENWKVU7MC.json","graph_json":"https://pith.science/api/pith-number/B7Z7ZI7UCMN7577Q2ENWKVU7MC/graph.json","events_json":"https://pith.science/api/pith-number/B7Z7ZI7UCMN7577Q2ENWKVU7MC/events.json","paper":"https://pith.science/paper/B7Z7ZI7U"},"agent_actions":{"view_html":"https://pith.science/pith/B7Z7ZI7UCMN7577Q2ENWKVU7MC","download_json":"https://pith.science/pith/B7Z7ZI7UCMN7577Q2ENWKVU7MC.json","view_paper":"https://pith.science/paper/B7Z7ZI7U","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/9910001&json=true","fetch_graph":"https://pith.science/api/pith-number/B7Z7ZI7UCMN7577Q2ENWKVU7MC/graph.json","fetch_events":"https://pith.science/api/pith-number/B7Z7ZI7UCMN7577Q2ENWKVU7MC/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/B7Z7ZI7UCMN7577Q2ENWKVU7MC/action/timestamp_anchor","attest_storage":"https://pith.science/pith/B7Z7ZI7UCMN7577Q2ENWKVU7MC/action/storage_attestation","attest_author":"https://pith.science/pith/B7Z7ZI7UCMN7577Q2ENWKVU7MC/action/author_attestation","sign_citation":"https://pith.science/pith/B7Z7ZI7UCMN7577Q2ENWKVU7MC/action/citation_signature","submit_replication":"https://pith.science/pith/B7Z7ZI7UCMN7577Q2ENWKVU7MC/action/replication_record"}},"created_at":"2026-05-18T01:40:12.588531+00:00","updated_at":"2026-05-18T01:40:12.588531+00:00"}