{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:7RT3EL5WTUQ4VRLRXR46JEZJS6","short_pith_number":"pith:7RT3EL5W","schema_version":"1.0","canonical_sha256":"fc67b22fb69d21cac571bc79e493299796ccf7bc3a8cf85b93ebd786ae70d9fe","source":{"kind":"arxiv","id":"0905.4842","version":1},"attestation_state":"computed","paper":{"title":"X-ray variability time scales in Active Galactic Nuclei","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"T. J.-L. Courvoisier, W. Ishibashi","submitted_at":"2009-05-29T12:17:58Z","abstract_excerpt":"X-ray variability in Active Galactic Nuclei (AGN) is commonly analysed in terms of the Power Spectral Density (PSD). The break observed in the power spectrum can be interpreted as a characteristic X-ray variability time scale. Here we study variability properties within the framework of clumpy accretion flows, in which shocks between accreting elements account for the UV and X-ray emissions. We derive a characteristic X-ray time scale, $\\tau_{X}$, and compare it with the measured PSD break time scale, $T_{B}$. A quite good agreement is found in both magnitude and trend. In particular, the mode"},"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":"0905.4842","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-05-29T12:17:58Z","cross_cats_sorted":[],"title_canon_sha256":"d1685352509e86ee1c6b10895cfa6e1cbf1cdbe652207c84e3b2a38a25cac94e","abstract_canon_sha256":"7301aa442ed1d54238fdad9f9304a2747aff282e2cc29e14f3dd935644c317cc"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:13:30.760536Z","signature_b64":"SMfo6TYFRkf3PvcGRMbSo/6YVgulXWDqGO83cKPrcBT37Bm/4YKqBSAJoLrZVHGlXFIMXCjtnKO8S4dHsBmLDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fc67b22fb69d21cac571bc79e493299796ccf7bc3a8cf85b93ebd786ae70d9fe","last_reissued_at":"2026-05-18T02:13:30.759775Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:13:30.759775Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"X-ray variability time scales in Active Galactic Nuclei","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"T. J.-L. Courvoisier, W. Ishibashi","submitted_at":"2009-05-29T12:17:58Z","abstract_excerpt":"X-ray variability in Active Galactic Nuclei (AGN) is commonly analysed in terms of the Power Spectral Density (PSD). The break observed in the power spectrum can be interpreted as a characteristic X-ray variability time scale. Here we study variability properties within the framework of clumpy accretion flows, in which shocks between accreting elements account for the UV and X-ray emissions. We derive a characteristic X-ray time scale, $\\tau_{X}$, and compare it with the measured PSD break time scale, $T_{B}$. A quite good agreement is found in both magnitude and trend. In particular, the mode"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.4842","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":"0905.4842","created_at":"2026-05-18T02:13:30.759897+00:00"},{"alias_kind":"arxiv_version","alias_value":"0905.4842v1","created_at":"2026-05-18T02:13:30.759897+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.4842","created_at":"2026-05-18T02:13:30.759897+00:00"},{"alias_kind":"pith_short_12","alias_value":"7RT3EL5WTUQ4","created_at":"2026-05-18T12:25:58.837520+00:00"},{"alias_kind":"pith_short_16","alias_value":"7RT3EL5WTUQ4VRLR","created_at":"2026-05-18T12:25:58.837520+00:00"},{"alias_kind":"pith_short_8","alias_value":"7RT3EL5W","created_at":"2026-05-18T12:25:58.837520+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/7RT3EL5WTUQ4VRLRXR46JEZJS6","json":"https://pith.science/pith/7RT3EL5WTUQ4VRLRXR46JEZJS6.json","graph_json":"https://pith.science/api/pith-number/7RT3EL5WTUQ4VRLRXR46JEZJS6/graph.json","events_json":"https://pith.science/api/pith-number/7RT3EL5WTUQ4VRLRXR46JEZJS6/events.json","paper":"https://pith.science/paper/7RT3EL5W"},"agent_actions":{"view_html":"https://pith.science/pith/7RT3EL5WTUQ4VRLRXR46JEZJS6","download_json":"https://pith.science/pith/7RT3EL5WTUQ4VRLRXR46JEZJS6.json","view_paper":"https://pith.science/paper/7RT3EL5W","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0905.4842&json=true","fetch_graph":"https://pith.science/api/pith-number/7RT3EL5WTUQ4VRLRXR46JEZJS6/graph.json","fetch_events":"https://pith.science/api/pith-number/7RT3EL5WTUQ4VRLRXR46JEZJS6/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/7RT3EL5WTUQ4VRLRXR46JEZJS6/action/timestamp_anchor","attest_storage":"https://pith.science/pith/7RT3EL5WTUQ4VRLRXR46JEZJS6/action/storage_attestation","attest_author":"https://pith.science/pith/7RT3EL5WTUQ4VRLRXR46JEZJS6/action/author_attestation","sign_citation":"https://pith.science/pith/7RT3EL5WTUQ4VRLRXR46JEZJS6/action/citation_signature","submit_replication":"https://pith.science/pith/7RT3EL5WTUQ4VRLRXR46JEZJS6/action/replication_record"}},"created_at":"2026-05-18T02:13:30.759897+00:00","updated_at":"2026-05-18T02:13:30.759897+00:00"}