{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:O32D6G4ARLJMBH2IPSFG2L5AU2","short_pith_number":"pith:O32D6G4A","canonical_record":{"source":{"id":"1503.05255","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-03-18T00:41:08Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"81c59345a370ff19b6c22a9b274aa918540b6a44be4dec633888579848e1291c","abstract_canon_sha256":"b5fbfa3e4713874c5f28d6a717df963f5f693bf2333301e6854730003729d9ed"},"schema_version":"1.0"},"canonical_sha256":"76f43f1b808ad2c09f487c8a6d2fa0a69e6da2ad4dedd10e749f1eb87f46483c","source":{"kind":"arxiv","id":"1503.05255","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.05255","created_at":"2026-05-18T01:59:37Z"},{"alias_kind":"arxiv_version","alias_value":"1503.05255v1","created_at":"2026-05-18T01:59:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.05255","created_at":"2026-05-18T01:59:37Z"},{"alias_kind":"pith_short_12","alias_value":"O32D6G4ARLJM","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"O32D6G4ARLJMBH2I","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"O32D6G4A","created_at":"2026-05-18T12:29:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:O32D6G4ARLJMBH2IPSFG2L5AU2","target":"record","payload":{"canonical_record":{"source":{"id":"1503.05255","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-03-18T00:41:08Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"81c59345a370ff19b6c22a9b274aa918540b6a44be4dec633888579848e1291c","abstract_canon_sha256":"b5fbfa3e4713874c5f28d6a717df963f5f693bf2333301e6854730003729d9ed"},"schema_version":"1.0"},"canonical_sha256":"76f43f1b808ad2c09f487c8a6d2fa0a69e6da2ad4dedd10e749f1eb87f46483c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:59:37.081406Z","signature_b64":"SeAxt0htJIQgL0AypcwouV1byxtU3oWbLF5NWVl72tEtT4H4UrpcF+pgFoP5KWnO5yv29/A+YEsUHWDoZFVUCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"76f43f1b808ad2c09f487c8a6d2fa0a69e6da2ad4dedd10e749f1eb87f46483c","last_reissued_at":"2026-05-18T01:59:37.080677Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:59:37.080677Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1503.05255","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:59:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R+gdk3B93Bdm9fFC4ftlijFRUaOLlFhnPPSk+kiyX0/Sw5EQcNtpZkQvZ3CwrTA4QtT+uPvYQIBRai0lcBpxDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T23:28:46.840821Z"},"content_sha256":"65cc989783cb57543a1f56e32db215a04b3083c233cc35c39facf270117fd438","schema_version":"1.0","event_id":"sha256:65cc989783cb57543a1f56e32db215a04b3083c233cc35c39facf270117fd438"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:O32D6G4ARLJMBH2IPSFG2L5AU2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Broad Iron Emission from Gravitationally Lensed Quasars Observed by Chandra","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":"D. J. Walton, D. Stern, F. A. Harrison, J. M. Miller, M. T. Reynolds, R. C. Reis","submitted_at":"2015-03-18T00:41:08Z","abstract_excerpt":"Recent work has demonstrated the potential of gravitationally lensed quasars to extend measurements of black hole spin out to high-redshift with the current generation of X-ray observatories. Here we present an analysis of a large sample of 27 lensed quasars in the redshift range 1.0<z<4.5 observed with Chandra, utilizing over 1.6 Ms of total observing time, focusing on the rest-frame iron K emission from these sources. Although the X-ray signal-to-noise (S/N) currently available does not permit the detection of iron emission from the inner accretion disk in individual cases in our sample, we "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.05255","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:59:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KiO2pjoNGzJM2u9Tsr23kB+4k94pAipvTmBl1GbojDyy7Gf2Z5bRUKpv9KMQFV+H21aFP48fJEc4wTSR9w+6Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T23:28:46.841307Z"},"content_sha256":"354826e065aa14c84f28c5a3c46e2a3aaad46caa0d14c288f0f249837c3d06ae","schema_version":"1.0","event_id":"sha256:354826e065aa14c84f28c5a3c46e2a3aaad46caa0d14c288f0f249837c3d06ae"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O32D6G4ARLJMBH2IPSFG2L5AU2/bundle.json","state_url":"https://pith.science/pith/O32D6G4ARLJMBH2IPSFG2L5AU2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O32D6G4ARLJMBH2IPSFG2L5AU2/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-26T23:28:46Z","links":{"resolver":"https://pith.science/pith/O32D6G4ARLJMBH2IPSFG2L5AU2","bundle":"https://pith.science/pith/O32D6G4ARLJMBH2IPSFG2L5AU2/bundle.json","state":"https://pith.science/pith/O32D6G4ARLJMBH2IPSFG2L5AU2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O32D6G4ARLJMBH2IPSFG2L5AU2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:O32D6G4ARLJMBH2IPSFG2L5AU2","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":"b5fbfa3e4713874c5f28d6a717df963f5f693bf2333301e6854730003729d9ed","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-03-18T00:41:08Z","title_canon_sha256":"81c59345a370ff19b6c22a9b274aa918540b6a44be4dec633888579848e1291c"},"schema_version":"1.0","source":{"id":"1503.05255","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.05255","created_at":"2026-05-18T01:59:37Z"},{"alias_kind":"arxiv_version","alias_value":"1503.05255v1","created_at":"2026-05-18T01:59:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.05255","created_at":"2026-05-18T01:59:37Z"},{"alias_kind":"pith_short_12","alias_value":"O32D6G4ARLJM","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"O32D6G4ARLJMBH2I","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"O32D6G4A","created_at":"2026-05-18T12:29:34Z"}],"graph_snapshots":[{"event_id":"sha256:354826e065aa14c84f28c5a3c46e2a3aaad46caa0d14c288f0f249837c3d06ae","target":"graph","created_at":"2026-05-18T01:59:37Z","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":"Recent work has demonstrated the potential of gravitationally lensed quasars to extend measurements of black hole spin out to high-redshift with the current generation of X-ray observatories. Here we present an analysis of a large sample of 27 lensed quasars in the redshift range 1.0<z<4.5 observed with Chandra, utilizing over 1.6 Ms of total observing time, focusing on the rest-frame iron K emission from these sources. Although the X-ray signal-to-noise (S/N) currently available does not permit the detection of iron emission from the inner accretion disk in individual cases in our sample, we ","authors_text":"D. J. Walton, D. Stern, F. A. Harrison, J. M. Miller, M. T. Reynolds, R. C. Reis","cross_cats":["astro-ph.CO","astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-03-18T00:41:08Z","title":"Broad Iron Emission from Gravitationally Lensed Quasars Observed by Chandra"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.05255","kind":"arxiv","version":1},"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":"sha256:65cc989783cb57543a1f56e32db215a04b3083c233cc35c39facf270117fd438","target":"record","created_at":"2026-05-18T01:59:37Z","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":"b5fbfa3e4713874c5f28d6a717df963f5f693bf2333301e6854730003729d9ed","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-03-18T00:41:08Z","title_canon_sha256":"81c59345a370ff19b6c22a9b274aa918540b6a44be4dec633888579848e1291c"},"schema_version":"1.0","source":{"id":"1503.05255","kind":"arxiv","version":1}},"canonical_sha256":"76f43f1b808ad2c09f487c8a6d2fa0a69e6da2ad4dedd10e749f1eb87f46483c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"76f43f1b808ad2c09f487c8a6d2fa0a69e6da2ad4dedd10e749f1eb87f46483c","first_computed_at":"2026-05-18T01:59:37.080677Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:59:37.080677Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SeAxt0htJIQgL0AypcwouV1byxtU3oWbLF5NWVl72tEtT4H4UrpcF+pgFoP5KWnO5yv29/A+YEsUHWDoZFVUCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:59:37.081406Z","signed_message":"canonical_sha256_bytes"},"source_id":"1503.05255","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:65cc989783cb57543a1f56e32db215a04b3083c233cc35c39facf270117fd438","sha256:354826e065aa14c84f28c5a3c46e2a3aaad46caa0d14c288f0f249837c3d06ae"],"state_sha256":"5cc4b202d916e81c7a4ba8b0e632756c2842bb624eccbdca5bb6ef450818d3f8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GfYQFp90TrTc9QiEILBY+pXQ/9PJlUz1ruFr6vEZd1y7UgQNy135FMFhjkBpyzRkeKrPgwHTd1gs6cK8YB/sCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T23:28:46.843901Z","bundle_sha256":"5c2c2209a8053548c617e8b754d7138d8eda01d20ae37c44b2328642ccad3988"}}