{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2022:7UAGHBY4PYXMMG6GOWAQCNCUOK","short_pith_number":"pith:7UAGHBY4","schema_version":"1.0","canonical_sha256":"fd0063871c7e2ec61bc67581013454728b6656d21d710cbed0d5eccb4a3e19d1","source":{"kind":"arxiv","id":"2203.15824","version":1},"attestation_state":"computed","paper":{"title":"A Rapid and Large-Amplitude X-ray Dimming Event in a z ~ 2.6 Radio-Quiet Quasar","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"B. Luo, Hezhen Liu, Jian Huang, Li-Ming Yu, Weimin Yi, W. N. Brandt, Xingting Pu","submitted_at":"2022-03-29T18:00:33Z","abstract_excerpt":"We report a dramatic fast X-ray dimming event in a z=2.627 radio-quiet type 1 quasar, which has an estimated supermassive black hole (SMBH) mass of $6.3\\times 10^{9} M_\\odot$. In the high X-ray state, it showed a typical level of X-ray emission relative to its UV/optical emission. Then its 0.5-2 keV (rest-frame 1.8-7.3 keV) flux dropped by a factor of $\\approx7.6$ within two rest-frame days. The dimming is associated with spectral hardening, as the 2-7 keV (rest-frame 7.3-25.4 keV) flux dropped by only $17\\%$ and the effective power-law photon index of the X-ray spectrum changed from $\\approx2"},"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":"2203.15824","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-03-29T18:00:33Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"18960926f84e2dce0368cb6a8fa5472246dcfd7800284b9147e3e34502bdef0f","abstract_canon_sha256":"64ab0702b820cd899fb433ca8ed41ded3e5ab3b7e9771a15fdd039c1cbb8333f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:23:54.102063Z","signature_b64":"7oywlWbWWqZWJxvLQtifdZN2ljDYeVXweJsCDIT4vSDWfntEP90MI13oYoQR1jevdQEvjmz3x8375NvRJ4KcCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fd0063871c7e2ec61bc67581013454728b6656d21d710cbed0d5eccb4a3e19d1","last_reissued_at":"2026-07-05T04:23:54.101624Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:23:54.101624Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A Rapid and Large-Amplitude X-ray Dimming Event in a z ~ 2.6 Radio-Quiet Quasar","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"B. Luo, Hezhen Liu, Jian Huang, Li-Ming Yu, Weimin Yi, W. N. Brandt, Xingting Pu","submitted_at":"2022-03-29T18:00:33Z","abstract_excerpt":"We report a dramatic fast X-ray dimming event in a z=2.627 radio-quiet type 1 quasar, which has an estimated supermassive black hole (SMBH) mass of $6.3\\times 10^{9} M_\\odot$. In the high X-ray state, it showed a typical level of X-ray emission relative to its UV/optical emission. Then its 0.5-2 keV (rest-frame 1.8-7.3 keV) flux dropped by a factor of $\\approx7.6$ within two rest-frame days. The dimming is associated with spectral hardening, as the 2-7 keV (rest-frame 7.3-25.4 keV) flux dropped by only $17\\%$ and the effective power-law photon index of the X-ray spectrum changed from $\\approx2"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2203.15824","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2203.15824/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2203.15824","created_at":"2026-07-05T04:23:54.101701+00:00"},{"alias_kind":"arxiv_version","alias_value":"2203.15824v1","created_at":"2026-07-05T04:23:54.101701+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2203.15824","created_at":"2026-07-05T04:23:54.101701+00:00"},{"alias_kind":"pith_short_12","alias_value":"7UAGHBY4PYXM","created_at":"2026-07-05T04:23:54.101701+00:00"},{"alias_kind":"pith_short_16","alias_value":"7UAGHBY4PYXMMG6G","created_at":"2026-07-05T04:23:54.101701+00:00"},{"alias_kind":"pith_short_8","alias_value":"7UAGHBY4","created_at":"2026-07-05T04:23:54.101701+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/7UAGHBY4PYXMMG6GOWAQCNCUOK","json":"https://pith.science/pith/7UAGHBY4PYXMMG6GOWAQCNCUOK.json","graph_json":"https://pith.science/api/pith-number/7UAGHBY4PYXMMG6GOWAQCNCUOK/graph.json","events_json":"https://pith.science/api/pith-number/7UAGHBY4PYXMMG6GOWAQCNCUOK/events.json","paper":"https://pith.science/paper/7UAGHBY4"},"agent_actions":{"view_html":"https://pith.science/pith/7UAGHBY4PYXMMG6GOWAQCNCUOK","download_json":"https://pith.science/pith/7UAGHBY4PYXMMG6GOWAQCNCUOK.json","view_paper":"https://pith.science/paper/7UAGHBY4","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2203.15824&json=true","fetch_graph":"https://pith.science/api/pith-number/7UAGHBY4PYXMMG6GOWAQCNCUOK/graph.json","fetch_events":"https://pith.science/api/pith-number/7UAGHBY4PYXMMG6GOWAQCNCUOK/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/7UAGHBY4PYXMMG6GOWAQCNCUOK/action/timestamp_anchor","attest_storage":"https://pith.science/pith/7UAGHBY4PYXMMG6GOWAQCNCUOK/action/storage_attestation","attest_author":"https://pith.science/pith/7UAGHBY4PYXMMG6GOWAQCNCUOK/action/author_attestation","sign_citation":"https://pith.science/pith/7UAGHBY4PYXMMG6GOWAQCNCUOK/action/citation_signature","submit_replication":"https://pith.science/pith/7UAGHBY4PYXMMG6GOWAQCNCUOK/action/replication_record"}},"created_at":"2026-07-05T04:23:54.101701+00:00","updated_at":"2026-07-05T04:23:54.101701+00:00"}