{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:CSXPJTX4AF2N3ZEUJBBV2CU5IJ","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":"6d3bc4a99a0809e6348f938bdd09948ed731d8002cfa5875c28c7df7d00a4498","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-11-06T18:35:09Z","title_canon_sha256":"fa0090b9aebbcb7ea81eea6fe0c14574dd6572da7f51ff3317c6276c5040ed1f"},"schema_version":"1.0","source":{"id":"1811.02544","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.02544","created_at":"2026-05-17T23:51:55Z"},{"alias_kind":"arxiv_version","alias_value":"1811.02544v2","created_at":"2026-05-17T23:51:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.02544","created_at":"2026-05-17T23:51:55Z"},{"alias_kind":"pith_short_12","alias_value":"CSXPJTX4AF2N","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"CSXPJTX4AF2N3ZEU","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"CSXPJTX4","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:b00da1ea5f81eaa949e7dc11ac07d51de37e7135827f857007a762b38b50e792","target":"graph","created_at":"2026-05-17T23:51:55Z","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 apparent position of jet base (core) in radio-loud active galactic nuclei changes with frequency because of synchrotron self-absorption. Studying this `core shift` effect enables us to reconstruct properties of the jet regions close to the central engine. We report here results from core shift measurements in AGNs observed with global VLBI at 2 and 8 GHz at epochs from 1994 to 2016. Our sample contains 40 objects observed at least 10 times during that period. The core shift is determined using a new automatic procedure introduced to minimize possible biases. The resulting multiple epoch me","authors_text":"A. B. Pushkarev (CrAO, A. P. Lobanov (MPIfR, ASC Lebedev), A.V. Plavin (ASC Lebedev, IEP Hamburg), Mipt), MIPT, Mpifr), Y.Y. Kovalev (ASC Lebedev","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-11-06T18:35:09Z","title":"Significant core shift variability in parsec-scale jets of active galactic nuclei"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.02544","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:a8e68504078b668651c9edf99ed9a5ffd8b0540ea4bcfe909aca6ebbc6a094bf","target":"record","created_at":"2026-05-17T23:51:55Z","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":"6d3bc4a99a0809e6348f938bdd09948ed731d8002cfa5875c28c7df7d00a4498","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-11-06T18:35:09Z","title_canon_sha256":"fa0090b9aebbcb7ea81eea6fe0c14574dd6572da7f51ff3317c6276c5040ed1f"},"schema_version":"1.0","source":{"id":"1811.02544","kind":"arxiv","version":2}},"canonical_sha256":"14aef4cefc0174dde49448435d0a9d424297292fabb58bf845971e8b80a3bc38","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"14aef4cefc0174dde49448435d0a9d424297292fabb58bf845971e8b80a3bc38","first_computed_at":"2026-05-17T23:51:55.817400Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:51:55.817400Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"456T4TUZKFRy7F7PdK3q75JMh9xlt64GgXlzL0rFZMuJab+ds60WB5RzTIvpEITVHOK0LjEMmuW5a6DdWYjmAw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:51:55.817848Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.02544","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a8e68504078b668651c9edf99ed9a5ffd8b0540ea4bcfe909aca6ebbc6a094bf","sha256:b00da1ea5f81eaa949e7dc11ac07d51de37e7135827f857007a762b38b50e792"],"state_sha256":"719c6a3cc0f49a1a6bdf634c07335979770e72c1fdc0505cecfc06386fea28d0"}