{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:VFMCPJMPSHJMVJEQKMRUYGMVL4","short_pith_number":"pith:VFMCPJMP","canonical_record":{"source":{"id":"astro-ph/0309403","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-09-15T16:12:25Z","cross_cats_sorted":[],"title_canon_sha256":"34ae15e6341b73a2c915fe1fa4568b3100fa8c69da5935502ea0da80780c3971","abstract_canon_sha256":"e283ed398b54f711e224b012724348efe957458f914235853fb60c9dce04fc3a"},"schema_version":"1.0"},"canonical_sha256":"a95827a58f91d2caa49053234c19955f1e28cb0f4e12b46b03eee08211707e46","source":{"kind":"arxiv","id":"astro-ph/0309403","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0309403","created_at":"2026-07-04T14:12:54Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0309403v1","created_at":"2026-07-04T14:12:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0309403","created_at":"2026-07-04T14:12:54Z"},{"alias_kind":"pith_short_12","alias_value":"VFMCPJMPSHJM","created_at":"2026-07-04T14:12:54Z"},{"alias_kind":"pith_short_16","alias_value":"VFMCPJMPSHJMVJEQ","created_at":"2026-07-04T14:12:54Z"},{"alias_kind":"pith_short_8","alias_value":"VFMCPJMP","created_at":"2026-07-04T14:12:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:VFMCPJMPSHJMVJEQKMRUYGMVL4","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0309403","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-09-15T16:12:25Z","cross_cats_sorted":[],"title_canon_sha256":"34ae15e6341b73a2c915fe1fa4568b3100fa8c69da5935502ea0da80780c3971","abstract_canon_sha256":"e283ed398b54f711e224b012724348efe957458f914235853fb60c9dce04fc3a"},"schema_version":"1.0"},"canonical_sha256":"a95827a58f91d2caa49053234c19955f1e28cb0f4e12b46b03eee08211707e46","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:12:54.061182Z","signature_b64":"ZuVO3R5RlFB+nlWhPrQJ1CdTRJeMkgltSZRenW5v56EC4vDJWF269m2IIvmw7rBhrdiTRBOPb6hAlkdT2t85AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a95827a58f91d2caa49053234c19955f1e28cb0f4e12b46b03eee08211707e46","last_reissued_at":"2026-07-04T14:12:54.060750Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:12:54.060750Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0309403","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":"2026-07-04T14:12:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IxMULoxt/KibUI+4xq4QfWsUqxqsBhDCMdVDYIINzmwe9toz98R1WlXpnvLZGNEIikFMopRiok+OCon2rt2WAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T20:41:16.436123Z"},"content_sha256":"afb441a4e316e544fde5b4489c8bb3053cd998c4230ed9d0cc769858ce906808","schema_version":"1.0","event_id":"sha256:afb441a4e316e544fde5b4489c8bb3053cd998c4230ed9d0cc769858ce906808"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:VFMCPJMPSHJMVJEQKMRUYGMVL4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multi-frequency & Multi-epoch VLBI study of Cygnus A","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Witzel, E. Middelberg, J.A. Zensus (Max-Planck-Institut fuer Radioastronomie), M. Kadler, T.P. Krichbaum, U. Bach, W. Alef","submitted_at":"2003-09-15T16:12:25Z","abstract_excerpt":"We present the first multi-frequency phase-referenced observations of Cygnus A done with the VLBA at 15 and 22 GHz. We find a pronounced two-sided jet structure, with a steep spectrum along the jet and a highly inverted spectrum towards the counter-jet. The inverted spectrum and the frequency dependent jet to counter-jet ratio suggest an obscuring torus in front of the counter-jet.\n  From 14 epochs of 15 GHz VLBA data we accurately derive the jet and counter-jet kinematics. For the inner jet (r <= 5 mas) we measure motions of beta_app ~ 0.2-0.5 h^{-1} and on the counter-jet side we find beta_ "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0309403","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0309403/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T14:12:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LimCSX6708F09B/85ZoQjV5bCcdedgqFIr7JxB8M3X0HP8B5yk+UQarxevS1p4xXy9mero1PZz1S96noWSydAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-31T20:41:16.436403Z"},"content_sha256":"e220196e9b6202ae9d420cf8dfe176676ec24bb6d0c6f3accabd3985566399ab","schema_version":"1.0","event_id":"sha256:e220196e9b6202ae9d420cf8dfe176676ec24bb6d0c6f3accabd3985566399ab"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VFMCPJMPSHJMVJEQKMRUYGMVL4/bundle.json","state_url":"https://pith.science/pith/VFMCPJMPSHJMVJEQKMRUYGMVL4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VFMCPJMPSHJMVJEQKMRUYGMVL4/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":"2026-07-31T20:41:16Z","links":{"resolver":"https://pith.science/pith/VFMCPJMPSHJMVJEQKMRUYGMVL4","bundle":"https://pith.science/pith/VFMCPJMPSHJMVJEQKMRUYGMVL4/bundle.json","state":"https://pith.science/pith/VFMCPJMPSHJMVJEQKMRUYGMVL4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VFMCPJMPSHJMVJEQKMRUYGMVL4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:VFMCPJMPSHJMVJEQKMRUYGMVL4","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":"e283ed398b54f711e224b012724348efe957458f914235853fb60c9dce04fc3a","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-09-15T16:12:25Z","title_canon_sha256":"34ae15e6341b73a2c915fe1fa4568b3100fa8c69da5935502ea0da80780c3971"},"schema_version":"1.0","source":{"id":"astro-ph/0309403","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0309403","created_at":"2026-07-04T14:12:54Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0309403v1","created_at":"2026-07-04T14:12:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0309403","created_at":"2026-07-04T14:12:54Z"},{"alias_kind":"pith_short_12","alias_value":"VFMCPJMPSHJM","created_at":"2026-07-04T14:12:54Z"},{"alias_kind":"pith_short_16","alias_value":"VFMCPJMPSHJMVJEQ","created_at":"2026-07-04T14:12:54Z"},{"alias_kind":"pith_short_8","alias_value":"VFMCPJMP","created_at":"2026-07-04T14:12:54Z"}],"graph_snapshots":[{"event_id":"sha256:e220196e9b6202ae9d420cf8dfe176676ec24bb6d0c6f3accabd3985566399ab","target":"graph","created_at":"2026-07-04T14:12:54Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/0309403/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present the first multi-frequency phase-referenced observations of Cygnus A done with the VLBA at 15 and 22 GHz. We find a pronounced two-sided jet structure, with a steep spectrum along the jet and a highly inverted spectrum towards the counter-jet. The inverted spectrum and the frequency dependent jet to counter-jet ratio suggest an obscuring torus in front of the counter-jet.\n  From 14 epochs of 15 GHz VLBA data we accurately derive the jet and counter-jet kinematics. For the inner jet (r <= 5 mas) we measure motions of beta_app ~ 0.2-0.5 h^{-1} and on the counter-jet side we find beta_ ","authors_text":"A. Witzel, E. Middelberg, J.A. Zensus (Max-Planck-Institut fuer Radioastronomie), M. Kadler, T.P. Krichbaum, U. Bach, W. Alef","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-09-15T16:12:25Z","title":"Multi-frequency & Multi-epoch VLBI study of Cygnus A"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0309403","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:afb441a4e316e544fde5b4489c8bb3053cd998c4230ed9d0cc769858ce906808","target":"record","created_at":"2026-07-04T14:12:54Z","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":"e283ed398b54f711e224b012724348efe957458f914235853fb60c9dce04fc3a","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-09-15T16:12:25Z","title_canon_sha256":"34ae15e6341b73a2c915fe1fa4568b3100fa8c69da5935502ea0da80780c3971"},"schema_version":"1.0","source":{"id":"astro-ph/0309403","kind":"arxiv","version":1}},"canonical_sha256":"a95827a58f91d2caa49053234c19955f1e28cb0f4e12b46b03eee08211707e46","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a95827a58f91d2caa49053234c19955f1e28cb0f4e12b46b03eee08211707e46","first_computed_at":"2026-07-04T14:12:54.060750Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T14:12:54.060750Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZuVO3R5RlFB+nlWhPrQJ1CdTRJeMkgltSZRenW5v56EC4vDJWF269m2IIvmw7rBhrdiTRBOPb6hAlkdT2t85AA==","signature_status":"signed_v1","signed_at":"2026-07-04T14:12:54.061182Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0309403","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:afb441a4e316e544fde5b4489c8bb3053cd998c4230ed9d0cc769858ce906808","sha256:e220196e9b6202ae9d420cf8dfe176676ec24bb6d0c6f3accabd3985566399ab"],"state_sha256":"97ff48576a2f50b40dd8cd5f39720bb55bdc8b2d1bbbcdeaa1a01a579d2e4849"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tQBmdtSm55yOEJEVg89toVBnGalAq8thaM5516xx8DCiJ11JjuSwmGCiQ7zOD+f9kIsVRm8TLxTwE9Z9QxQyBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-31T20:41:16.438818Z","bundle_sha256":"74b0c8d9c64da69ce294db9f4d24a7937be0923da082fac6e0019d5d081fa8ec"}}