{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:FOOEKNIRFLJ3KWWIKMPYXD56TK","short_pith_number":"pith:FOOEKNIR","schema_version":"1.0","canonical_sha256":"2b9c4535112ad3b55ac8531f8b8fbe9a8f1a05dbd2280da6c55ee336c9c79d26","source":{"kind":"arxiv","id":"1810.12607","version":1},"attestation_state":"computed","paper":{"title":"Detection of a quasi-periodic oscillation in gamma-ray light curve of the high redshift blazar B2 1520+31","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alok C. Gupta, Ashutosh Tripathi, Cosimo Bambi, Pankaj Kushwaha, Paul J. Wiita, Zhongli Zhang","submitted_at":"2018-10-30T09:41:46Z","abstract_excerpt":"We detected a possible quasi-periodic oscillation (QPO) of ~ 71 days in the 0.1 -- 300 GeV gamma-ray Fermi-LAT light curve of the high redshift flat spectrum radio quasar B2 1520+31. We identify and confirm that quasi-period by Lomb Scargle periodogram (LSP), and weighted wavelet z-transform (WWZ) analyses. Using this QPO period, and assuming it originates from accretion-disc fluctuations at the innermost stable circular orbit, we estimate the central supermassive black hole mass to range between ~ 5.4 * 10$^{9}$ M$_{\\odot}$ for a non-rotating black hole and ~ 6.0 * 10$^{10}$ M$_{\\odot}$ for a"},"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":"1810.12607","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-30T09:41:46Z","cross_cats_sorted":[],"title_canon_sha256":"c377bf3a105567b020c70f6c0321592b2a070e84fb5b3a6e7aa99555f0278709","abstract_canon_sha256":"f25869909f4c8eecf9924880c63332cf1855ef267c5186be3858f6f51942d212"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:52:40.219517Z","signature_b64":"/cSLOZo1C0y00JLMJyLBcTvYUiKihvqQ2WjYuL2CTkZpvgaj6CBb9QYnGdyW4ZGKe/ULMEJG6xQVB0ootJmLCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2b9c4535112ad3b55ac8531f8b8fbe9a8f1a05dbd2280da6c55ee336c9c79d26","last_reissued_at":"2026-05-17T23:52:40.218701Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:52:40.218701Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Detection of a quasi-periodic oscillation in gamma-ray light curve of the high redshift blazar B2 1520+31","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alok C. Gupta, Ashutosh Tripathi, Cosimo Bambi, Pankaj Kushwaha, Paul J. Wiita, Zhongli Zhang","submitted_at":"2018-10-30T09:41:46Z","abstract_excerpt":"We detected a possible quasi-periodic oscillation (QPO) of ~ 71 days in the 0.1 -- 300 GeV gamma-ray Fermi-LAT light curve of the high redshift flat spectrum radio quasar B2 1520+31. We identify and confirm that quasi-period by Lomb Scargle periodogram (LSP), and weighted wavelet z-transform (WWZ) analyses. Using this QPO period, and assuming it originates from accretion-disc fluctuations at the innermost stable circular orbit, we estimate the central supermassive black hole mass to range between ~ 5.4 * 10$^{9}$ M$_{\\odot}$ for a non-rotating black hole and ~ 6.0 * 10$^{10}$ M$_{\\odot}$ for a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.12607","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":"1810.12607","created_at":"2026-05-17T23:52:40.218820+00:00"},{"alias_kind":"arxiv_version","alias_value":"1810.12607v1","created_at":"2026-05-17T23:52:40.218820+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.12607","created_at":"2026-05-17T23:52:40.218820+00:00"},{"alias_kind":"pith_short_12","alias_value":"FOOEKNIRFLJ3","created_at":"2026-05-18T12:32:25.280505+00:00"},{"alias_kind":"pith_short_16","alias_value":"FOOEKNIRFLJ3KWWI","created_at":"2026-05-18T12:32:25.280505+00:00"},{"alias_kind":"pith_short_8","alias_value":"FOOEKNIR","created_at":"2026-05-18T12:32:25.280505+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/FOOEKNIRFLJ3KWWIKMPYXD56TK","json":"https://pith.science/pith/FOOEKNIRFLJ3KWWIKMPYXD56TK.json","graph_json":"https://pith.science/api/pith-number/FOOEKNIRFLJ3KWWIKMPYXD56TK/graph.json","events_json":"https://pith.science/api/pith-number/FOOEKNIRFLJ3KWWIKMPYXD56TK/events.json","paper":"https://pith.science/paper/FOOEKNIR"},"agent_actions":{"view_html":"https://pith.science/pith/FOOEKNIRFLJ3KWWIKMPYXD56TK","download_json":"https://pith.science/pith/FOOEKNIRFLJ3KWWIKMPYXD56TK.json","view_paper":"https://pith.science/paper/FOOEKNIR","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1810.12607&json=true","fetch_graph":"https://pith.science/api/pith-number/FOOEKNIRFLJ3KWWIKMPYXD56TK/graph.json","fetch_events":"https://pith.science/api/pith-number/FOOEKNIRFLJ3KWWIKMPYXD56TK/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/FOOEKNIRFLJ3KWWIKMPYXD56TK/action/timestamp_anchor","attest_storage":"https://pith.science/pith/FOOEKNIRFLJ3KWWIKMPYXD56TK/action/storage_attestation","attest_author":"https://pith.science/pith/FOOEKNIRFLJ3KWWIKMPYXD56TK/action/author_attestation","sign_citation":"https://pith.science/pith/FOOEKNIRFLJ3KWWIKMPYXD56TK/action/citation_signature","submit_replication":"https://pith.science/pith/FOOEKNIRFLJ3KWWIKMPYXD56TK/action/replication_record"}},"created_at":"2026-05-17T23:52:40.218820+00:00","updated_at":"2026-05-17T23:52:40.218820+00:00"}