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The 15 GHz light curve of the flat spectrum radio quasar J1359+4011 shows a strong and persistent quasi-periodic oscillation. The time-scale of the oscillation varies between 120 and 150 days over a $\\sim4$ year time span. We interpret this as the active galactic nucleus mass-scaled analog of low-frequency quasi-periodic oscillations from Galactic microquasars, or as evidence of modulation of the accretion flow by thermal instabilites in the \"inner\" accretion disc."},"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":"1309.1158","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-09-04T20:00:00Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"56c1daeccf059d68d6e8119b564e1d9630e1934ce419f258c4c22be538dfead0","abstract_canon_sha256":"ccdfb16529d448e18389303b0a4a0ae8ea5b717e43d816eac52bfb98a61e58da"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:47:49.720749Z","signature_b64":"Lp3th0LgLgOgNCwBjNEkS0V6LB8NDsa1ZERDFTLPG11c1IQW4H7v7ZlenP6w5yqLRibokBgQa4/zNGVL0xOuAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b9749221522a6a2b1f709f2d139d5f56589517927078f8688fe3d21a6f40171c","last_reissued_at":"2026-05-18T01:47:49.720266Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:47:49.720266Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A quasi-periodic oscillation in the blazar J1359+4011","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"A.C.S. 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