{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:JY4FCZM4ZNB2M33IUMLSB3RPMH","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"79e5feb8745c6a93a5d6d4d23ae299a3698f8df0ce3f45de6b475594c8fbf5dc","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-09-23T07:59:01Z","title_canon_sha256":"26867c2822f8b41ce4c4b725c22cec318bde30b200e670ef0882a5cf8dbe7f98"},"schema_version":"1.0","source":{"id":"1309.5721","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.5721","created_at":"2026-05-18T03:11:12Z"},{"alias_kind":"arxiv_version","alias_value":"1309.5721v2","created_at":"2026-05-18T03:11:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.5721","created_at":"2026-05-18T03:11:12Z"},{"alias_kind":"pith_short_12","alias_value":"JY4FCZM4ZNB2","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_16","alias_value":"JY4FCZM4ZNB2M33I","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_8","alias_value":"JY4FCZM4","created_at":"2026-05-18T12:27:49Z"}],"graph_snapshots":[{"event_id":"sha256:a574189b0991e2037d02f08119225cc4c0d7d086c496cfc0c52cf22151b0a8f8","target":"graph","created_at":"2026-05-18T03:11:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"The most extreme ultraluminous X-ray sources (ULXs), with $L_\\mathrm{X} > 5 \\times 10^{40}$ erg s$^{-1}$, are amongst the best candidates for hosting intermediate-mass black holes (IMBHs) in the haloes of galaxies. Jet radio emission is expected from a sub-Eddington accreting IMBH in the low/hard (radio bright) state. In a search for such IMBH jet radio emission, we have observed with the Very Large Array (VLA) at 5 GHz a sample of seven extreme ULXs whose X-ray properties indicate they are in the hard state. Assuming they remain in this state, the non-detection of radio emission for six of th","authors_text":"A.D.Sutton, A.P.Lobanov, M.Mezcua, T.P.Roberts","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-09-23T07:59:01Z","title":"Radio observations of extreme ULXs: revealing the most powerful ULX radio nebula ever or the jet of an intermediate-mass black hole?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.5721","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:762355cde9e077565a1c21cf57856b5dbf1f7ed69d4e3c2d460b2643b9d6e27c","target":"record","created_at":"2026-05-18T03:11:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"79e5feb8745c6a93a5d6d4d23ae299a3698f8df0ce3f45de6b475594c8fbf5dc","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-09-23T07:59:01Z","title_canon_sha256":"26867c2822f8b41ce4c4b725c22cec318bde30b200e670ef0882a5cf8dbe7f98"},"schema_version":"1.0","source":{"id":"1309.5721","kind":"arxiv","version":2}},"canonical_sha256":"4e3851659ccb43a66f68a31720ee2f61ce90e854f33297d50905f36ebea9faf6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4e3851659ccb43a66f68a31720ee2f61ce90e854f33297d50905f36ebea9faf6","first_computed_at":"2026-05-18T03:11:12.405075Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:11:12.405075Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"d0VJGP1WfsMRytgoABx1J0djxOjB9RBl4yKktcUmtaB6RTXTnqBWPKVhb60HllJ6eh9Xp+KfikFXxU7bqHWNCg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:11:12.405823Z","signed_message":"canonical_sha256_bytes"},"source_id":"1309.5721","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:762355cde9e077565a1c21cf57856b5dbf1f7ed69d4e3c2d460b2643b9d6e27c","sha256:a574189b0991e2037d02f08119225cc4c0d7d086c496cfc0c52cf22151b0a8f8"],"state_sha256":"47efefd35278bc4b716d576841ff2d97d903c7a4c1949982fb6797ceecbf87c2"}