{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:MMZ6A72K3EQYKBM4PTCBSEDQH3","short_pith_number":"pith:MMZ6A72K","canonical_record":{"source":{"id":"1207.5457","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-23T17:11:45Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"f3deeeecaf4f538c61f098676ec322c3b34b70ba49cec3a12fce6ff281a9cb64","abstract_canon_sha256":"f5f034ac548292fca22dadcea73c4fcf1ef34dec06cb4f7a6d38d853fb312c98"},"schema_version":"1.0"},"canonical_sha256":"6333e07f4ad92185059c7cc41910703ee8a3bba805ddb306819c287d62967cab","source":{"kind":"arxiv","id":"1207.5457","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.5457","created_at":"2026-05-18T03:45:20Z"},{"alias_kind":"arxiv_version","alias_value":"1207.5457v1","created_at":"2026-05-18T03:45:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.5457","created_at":"2026-05-18T03:45:20Z"},{"alias_kind":"pith_short_12","alias_value":"MMZ6A72K3EQY","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"MMZ6A72K3EQYKBM4","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"MMZ6A72K","created_at":"2026-05-18T12:27:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:MMZ6A72K3EQYKBM4PTCBSEDQH3","target":"record","payload":{"canonical_record":{"source":{"id":"1207.5457","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-23T17:11:45Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"f3deeeecaf4f538c61f098676ec322c3b34b70ba49cec3a12fce6ff281a9cb64","abstract_canon_sha256":"f5f034ac548292fca22dadcea73c4fcf1ef34dec06cb4f7a6d38d853fb312c98"},"schema_version":"1.0"},"canonical_sha256":"6333e07f4ad92185059c7cc41910703ee8a3bba805ddb306819c287d62967cab","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:45:20.880200Z","signature_b64":"DA1ZcQPnXOdtKM5rXSXgDgkX2sojLozbiZSdL54Xb+xq6OlqgJYBETJvnWP9QFyvnTle+1uKuR1jAETrj3RqAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6333e07f4ad92185059c7cc41910703ee8a3bba805ddb306819c287d62967cab","last_reissued_at":"2026-05-18T03:45:20.879670Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:45:20.879670Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1207.5457","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":"2026-05-18T03:45:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dEw0qhjxtNcVfR7oUayobtQ3qXUh8OUoTKUNArTa/tBPJCcyrQFyap0MlmdQVEYzIadtkt98pnAQdK2uu9g2Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T02:07:06.364151Z"},"content_sha256":"9f772e952effebdde5ea98c4de4fa488cc9e4ba5b74fa04b812c92bc08514a58","schema_version":"1.0","event_id":"sha256:9f772e952effebdde5ea98c4de4fa488cc9e4ba5b74fa04b812c92bc08514a58"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:MMZ6A72K3EQYKBM4PTCBSEDQH3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"MOJAVE: Monitoring of Jets in Active Galactic Nuclei with VLBA Experiments. IX. Nuclear opacity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"A. B. Pushkarev, A. P. Lobanov, J. A. Zensus, M. L. Lister, T. Hovatta, T. Savolainen, Y. Y. Kovalev","submitted_at":"2012-07-23T17:11:45Z","abstract_excerpt":"We have investigated a frequency-dependent shift in the absolute position of the optically thick apparent origin of parsec-scale jets (\"core shift\" effect) to probe physical conditions in ultra-compact relativistic outflows in AGN. We used multi-frequency Very Long Baseline Array (VLBA) observations of 191 sources carried out in 12 epochs in 2006 within the MOJAVE program. The observations were performed at 8.1, 8.4, 12.1, and 15.4 GHz. We implemented a method of determining the core shift vector based on (i) image registration by two-dimensional normalized cross-correlation and (ii) model-fit"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.5457","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":"2026-05-18T03:45:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HKuPjJAzZSw6kL/iU6HN+A9Nn8pVDo1GnW/JCDkuodOFaK4aJQLHLAjwiZUuQo0Z6bIkfbDp1apNmJ5Hnkc2Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T02:07:06.364614Z"},"content_sha256":"5578e7b6dfd6b0c024d42646aaa8edb8d8cfea3064d55aac7d4b38796fe897ef","schema_version":"1.0","event_id":"sha256:5578e7b6dfd6b0c024d42646aaa8edb8d8cfea3064d55aac7d4b38796fe897ef"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MMZ6A72K3EQYKBM4PTCBSEDQH3/bundle.json","state_url":"https://pith.science/pith/MMZ6A72K3EQYKBM4PTCBSEDQH3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MMZ6A72K3EQYKBM4PTCBSEDQH3/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":"2026-06-01T02:07:06Z","links":{"resolver":"https://pith.science/pith/MMZ6A72K3EQYKBM4PTCBSEDQH3","bundle":"https://pith.science/pith/MMZ6A72K3EQYKBM4PTCBSEDQH3/bundle.json","state":"https://pith.science/pith/MMZ6A72K3EQYKBM4PTCBSEDQH3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MMZ6A72K3EQYKBM4PTCBSEDQH3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:MMZ6A72K3EQYKBM4PTCBSEDQH3","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":"f5f034ac548292fca22dadcea73c4fcf1ef34dec06cb4f7a6d38d853fb312c98","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-23T17:11:45Z","title_canon_sha256":"f3deeeecaf4f538c61f098676ec322c3b34b70ba49cec3a12fce6ff281a9cb64"},"schema_version":"1.0","source":{"id":"1207.5457","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.5457","created_at":"2026-05-18T03:45:20Z"},{"alias_kind":"arxiv_version","alias_value":"1207.5457v1","created_at":"2026-05-18T03:45:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.5457","created_at":"2026-05-18T03:45:20Z"},{"alias_kind":"pith_short_12","alias_value":"MMZ6A72K3EQY","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"MMZ6A72K3EQYKBM4","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"MMZ6A72K","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:5578e7b6dfd6b0c024d42646aaa8edb8d8cfea3064d55aac7d4b38796fe897ef","target":"graph","created_at":"2026-05-18T03:45:20Z","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":"We have investigated a frequency-dependent shift in the absolute position of the optically thick apparent origin of parsec-scale jets (\"core shift\" effect) to probe physical conditions in ultra-compact relativistic outflows in AGN. We used multi-frequency Very Long Baseline Array (VLBA) observations of 191 sources carried out in 12 epochs in 2006 within the MOJAVE program. The observations were performed at 8.1, 8.4, 12.1, and 15.4 GHz. We implemented a method of determining the core shift vector based on (i) image registration by two-dimensional normalized cross-correlation and (ii) model-fit","authors_text":"A. B. Pushkarev, A. P. Lobanov, J. A. Zensus, M. L. Lister, T. Hovatta, T. Savolainen, Y. Y. Kovalev","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-23T17:11:45Z","title":"MOJAVE: Monitoring of Jets in Active Galactic Nuclei with VLBA Experiments. IX. Nuclear opacity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.5457","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":"sha256:9f772e952effebdde5ea98c4de4fa488cc9e4ba5b74fa04b812c92bc08514a58","target":"record","created_at":"2026-05-18T03:45:20Z","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":"f5f034ac548292fca22dadcea73c4fcf1ef34dec06cb4f7a6d38d853fb312c98","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-23T17:11:45Z","title_canon_sha256":"f3deeeecaf4f538c61f098676ec322c3b34b70ba49cec3a12fce6ff281a9cb64"},"schema_version":"1.0","source":{"id":"1207.5457","kind":"arxiv","version":1}},"canonical_sha256":"6333e07f4ad92185059c7cc41910703ee8a3bba805ddb306819c287d62967cab","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6333e07f4ad92185059c7cc41910703ee8a3bba805ddb306819c287d62967cab","first_computed_at":"2026-05-18T03:45:20.879670Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:45:20.879670Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DA1ZcQPnXOdtKM5rXSXgDgkX2sojLozbiZSdL54Xb+xq6OlqgJYBETJvnWP9QFyvnTle+1uKuR1jAETrj3RqAg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:45:20.880200Z","signed_message":"canonical_sha256_bytes"},"source_id":"1207.5457","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9f772e952effebdde5ea98c4de4fa488cc9e4ba5b74fa04b812c92bc08514a58","sha256:5578e7b6dfd6b0c024d42646aaa8edb8d8cfea3064d55aac7d4b38796fe897ef"],"state_sha256":"6294d1e72e549df6f71ca9fdbf5c6b1dc4879047b0b47e0fbac88f1f6fafc740"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AGwbSERV02iyRG288j9qCnT1mTpXK8XzwdDNGFxSdO0B0ZMtvV+kuuUAdieWe7wDWMMtrS47V4z9WQPmVW2aBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T02:07:06.369055Z","bundle_sha256":"86f7514becfeacf4f1b7f3ba3f689961b6a7deb19e6c229805ea2e5c786f437d"}}