{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:R5UGWSKDRK5RENTT2YXG7EPKXT","short_pith_number":"pith:R5UGWSKD","schema_version":"1.0","canonical_sha256":"8f686b49438abb123673d62e6f91eabce6ce213204259cd23a6f88175f7e7021","source":{"kind":"arxiv","id":"1508.01328","version":1},"attestation_state":"computed","paper":{"title":"X-ray time lags and nonlinear variability in the ultraluminous X-ray sources NGC 5408 X-1 and NGC 6946 X-1","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"L. Hern\\'andez-Garc\\'ia, M. Middleton, S. Vaughan, T.P. Roberts","submitted_at":"2015-08-06T09:00:27Z","abstract_excerpt":"We present our analysis of the X-ray variability of two ultraluminous X-ray sources (ULXs) based on multiple XMM--Newton observations. We show the linear rms-flux relation is present in eight observations of NGC5408 X-1 and also in three observations of NGC6946 X-1, but data from other ULXs are generally not sufficient to constrain any rms-flux relation. The presence of this relation was previously reported in only two observations of NGC 5408X-1; our results show this is a persistent property of the variability of NGC5408 X-1 and extends to at least one other variable ULX. We speculate this i"},"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":"1508.01328","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-08-06T09:00:27Z","cross_cats_sorted":[],"title_canon_sha256":"6ca3fa92756394852fe8f489fb3ab4efa99289492c4fe58a958b264c3becbb94","abstract_canon_sha256":"99675d3d02193c033bd09f763082e706dae96c76d67cbd29ecb13bcf68533fb0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:32:59.402785Z","signature_b64":"3eGKDj+pgz055f3n5MsNuSlN45csdjNrmj9JW+v3aPpWBwvTq64yBn7v9+QjsnB/MSEqynUJ9MUIXGWz3bEKDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8f686b49438abb123673d62e6f91eabce6ce213204259cd23a6f88175f7e7021","last_reissued_at":"2026-05-18T01:32:59.402297Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:32:59.402297Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"X-ray time lags and nonlinear variability in the ultraluminous X-ray sources NGC 5408 X-1 and NGC 6946 X-1","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"L. Hern\\'andez-Garc\\'ia, M. Middleton, S. Vaughan, T.P. Roberts","submitted_at":"2015-08-06T09:00:27Z","abstract_excerpt":"We present our analysis of the X-ray variability of two ultraluminous X-ray sources (ULXs) based on multiple XMM--Newton observations. We show the linear rms-flux relation is present in eight observations of NGC5408 X-1 and also in three observations of NGC6946 X-1, but data from other ULXs are generally not sufficient to constrain any rms-flux relation. The presence of this relation was previously reported in only two observations of NGC 5408X-1; our results show this is a persistent property of the variability of NGC5408 X-1 and extends to at least one other variable ULX. We speculate this i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.01328","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":"1508.01328","created_at":"2026-05-18T01:32:59.402385+00:00"},{"alias_kind":"arxiv_version","alias_value":"1508.01328v1","created_at":"2026-05-18T01:32:59.402385+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.01328","created_at":"2026-05-18T01:32:59.402385+00:00"},{"alias_kind":"pith_short_12","alias_value":"R5UGWSKDRK5R","created_at":"2026-05-18T12:29:39.896362+00:00"},{"alias_kind":"pith_short_16","alias_value":"R5UGWSKDRK5RENTT","created_at":"2026-05-18T12:29:39.896362+00:00"},{"alias_kind":"pith_short_8","alias_value":"R5UGWSKD","created_at":"2026-05-18T12:29:39.896362+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/R5UGWSKDRK5RENTT2YXG7EPKXT","json":"https://pith.science/pith/R5UGWSKDRK5RENTT2YXG7EPKXT.json","graph_json":"https://pith.science/api/pith-number/R5UGWSKDRK5RENTT2YXG7EPKXT/graph.json","events_json":"https://pith.science/api/pith-number/R5UGWSKDRK5RENTT2YXG7EPKXT/events.json","paper":"https://pith.science/paper/R5UGWSKD"},"agent_actions":{"view_html":"https://pith.science/pith/R5UGWSKDRK5RENTT2YXG7EPKXT","download_json":"https://pith.science/pith/R5UGWSKDRK5RENTT2YXG7EPKXT.json","view_paper":"https://pith.science/paper/R5UGWSKD","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1508.01328&json=true","fetch_graph":"https://pith.science/api/pith-number/R5UGWSKDRK5RENTT2YXG7EPKXT/graph.json","fetch_events":"https://pith.science/api/pith-number/R5UGWSKDRK5RENTT2YXG7EPKXT/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/R5UGWSKDRK5RENTT2YXG7EPKXT/action/timestamp_anchor","attest_storage":"https://pith.science/pith/R5UGWSKDRK5RENTT2YXG7EPKXT/action/storage_attestation","attest_author":"https://pith.science/pith/R5UGWSKDRK5RENTT2YXG7EPKXT/action/author_attestation","sign_citation":"https://pith.science/pith/R5UGWSKDRK5RENTT2YXG7EPKXT/action/citation_signature","submit_replication":"https://pith.science/pith/R5UGWSKDRK5RENTT2YXG7EPKXT/action/replication_record"}},"created_at":"2026-05-18T01:32:59.402385+00:00","updated_at":"2026-05-18T01:32:59.402385+00:00"}