{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:YPEBM7IAPM5R5PE2IMLIO722AM","short_pith_number":"pith:YPEBM7IA","canonical_record":{"source":{"id":"1901.00509","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-02T19:06:30Z","cross_cats_sorted":[],"title_canon_sha256":"a9049f7b71f0752bb28640f999b2e017005eae7a7bca363fa38b8d6cde4c1d6c","abstract_canon_sha256":"82329a45ea410c28084b1ee5f06ee4a563b6e0df7ffbe2108f986fb2d3fe2b77"},"schema_version":"1.0"},"canonical_sha256":"c3c8167d007b3b1ebc9a4316877f5a032c0ff1d340266689b091b451b8652404","source":{"kind":"arxiv","id":"1901.00509","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.00509","created_at":"2026-05-17T23:54:15Z"},{"alias_kind":"arxiv_version","alias_value":"1901.00509v2","created_at":"2026-05-17T23:54:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.00509","created_at":"2026-05-17T23:54:15Z"},{"alias_kind":"pith_short_12","alias_value":"YPEBM7IAPM5R","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"YPEBM7IAPM5R5PE2","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"YPEBM7IA","created_at":"2026-05-18T12:33:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:YPEBM7IAPM5R5PE2IMLIO722AM","target":"record","payload":{"canonical_record":{"source":{"id":"1901.00509","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-02T19:06:30Z","cross_cats_sorted":[],"title_canon_sha256":"a9049f7b71f0752bb28640f999b2e017005eae7a7bca363fa38b8d6cde4c1d6c","abstract_canon_sha256":"82329a45ea410c28084b1ee5f06ee4a563b6e0df7ffbe2108f986fb2d3fe2b77"},"schema_version":"1.0"},"canonical_sha256":"c3c8167d007b3b1ebc9a4316877f5a032c0ff1d340266689b091b451b8652404","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:54:15.397467Z","signature_b64":"8BmchoIXq0vKhi9dP0WQyv737dyMFp3HV54ZmE5QIIH8RQJrbQdNVjt9fhK9Ea9QphNYI49aZUudBIIPQHaJAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c3c8167d007b3b1ebc9a4316877f5a032c0ff1d340266689b091b451b8652404","last_reissued_at":"2026-05-17T23:54:15.397020Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:54:15.397020Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.00509","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:54:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NtvW5/O4NFMaNpt68SvtLmx5r/LqN3kIIleZqDQWHxMi2VRRAmZEG1Tkn7jbOf7Ryu73OvzL4ariV8MI31/hAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T10:04:18.776222Z"},"content_sha256":"61f5d76c6f992de96ef64c84d649e5183bff96108203ea9650528205d423798f","schema_version":"1.0","event_id":"sha256:61f5d76c6f992de96ef64c84d649e5183bff96108203ea9650528205d423798f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:YPEBM7IAPM5R5PE2IMLIO722AM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Variability and Proper Motion of X-ray Knots in the Jet of Centaurus A","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Bradford Snios, Christine Jones, Diana M. Worrall, Eileen T. Meyer, Elke Roediger, Mark Birkinshaw, Martin J. Hardcastle, Paul E. J. Nulsen, Ralph P. Kraft, Sarka Wykes, William R. Forman","submitted_at":"2019-01-02T19:06:30Z","abstract_excerpt":"We report results from Chandra observations analyzed for evidence of variability and proper motion in the X-ray jet of Centaurus A. Using data spanning 15 years, collective proper motion of $11.3\\pm3.3$ mas yr$^{-1}$, or $0.68\\pm0.20c$, is detected for the fainter X-ray knots and other substructure present within the jet. The three brightest knots (AX1A, AX1C, and BX2) are found to be stationary to an upper limit of $0.10c$. Brightness variations up to 27% are detected for several X-ray knots in the jet. For the fading knots, BX2 and AX1C, the changes in spectral slope expected to accompany sy"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.00509","kind":"arxiv","version":2},"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":"2026-05-17T23:54:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SOZtEX0pEH32m+w12wzIOHTw7Mftl4FiB8UUR+D+bR9gkuwd/9n0nTcZHCVMyBJCjVZQwdIV0yvScQBUhymRBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T10:04:18.776589Z"},"content_sha256":"37601795e6616db75616c9b233992fc638f8a667b784f58726cdf6de5246f4f7","schema_version":"1.0","event_id":"sha256:37601795e6616db75616c9b233992fc638f8a667b784f58726cdf6de5246f4f7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YPEBM7IAPM5R5PE2IMLIO722AM/bundle.json","state_url":"https://pith.science/pith/YPEBM7IAPM5R5PE2IMLIO722AM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YPEBM7IAPM5R5PE2IMLIO722AM/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":"2026-05-30T10:04:18Z","links":{"resolver":"https://pith.science/pith/YPEBM7IAPM5R5PE2IMLIO722AM","bundle":"https://pith.science/pith/YPEBM7IAPM5R5PE2IMLIO722AM/bundle.json","state":"https://pith.science/pith/YPEBM7IAPM5R5PE2IMLIO722AM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YPEBM7IAPM5R5PE2IMLIO722AM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:YPEBM7IAPM5R5PE2IMLIO722AM","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":"82329a45ea410c28084b1ee5f06ee4a563b6e0df7ffbe2108f986fb2d3fe2b77","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-02T19:06:30Z","title_canon_sha256":"a9049f7b71f0752bb28640f999b2e017005eae7a7bca363fa38b8d6cde4c1d6c"},"schema_version":"1.0","source":{"id":"1901.00509","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.00509","created_at":"2026-05-17T23:54:15Z"},{"alias_kind":"arxiv_version","alias_value":"1901.00509v2","created_at":"2026-05-17T23:54:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.00509","created_at":"2026-05-17T23:54:15Z"},{"alias_kind":"pith_short_12","alias_value":"YPEBM7IAPM5R","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"YPEBM7IAPM5R5PE2","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"YPEBM7IA","created_at":"2026-05-18T12:33:33Z"}],"graph_snapshots":[{"event_id":"sha256:37601795e6616db75616c9b233992fc638f8a667b784f58726cdf6de5246f4f7","target":"graph","created_at":"2026-05-17T23:54:15Z","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 report results from Chandra observations analyzed for evidence of variability and proper motion in the X-ray jet of Centaurus A. Using data spanning 15 years, collective proper motion of $11.3\\pm3.3$ mas yr$^{-1}$, or $0.68\\pm0.20c$, is detected for the fainter X-ray knots and other substructure present within the jet. The three brightest knots (AX1A, AX1C, and BX2) are found to be stationary to an upper limit of $0.10c$. Brightness variations up to 27% are detected for several X-ray knots in the jet. For the fading knots, BX2 and AX1C, the changes in spectral slope expected to accompany sy","authors_text":"Bradford Snios, Christine Jones, Diana M. Worrall, Eileen T. Meyer, Elke Roediger, Mark Birkinshaw, Martin J. Hardcastle, Paul E. J. Nulsen, Ralph P. Kraft, Sarka Wykes, William R. Forman","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-02T19:06:30Z","title":"Variability and Proper Motion of X-ray Knots in the Jet of Centaurus A"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.00509","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":"sha256:61f5d76c6f992de96ef64c84d649e5183bff96108203ea9650528205d423798f","target":"record","created_at":"2026-05-17T23:54:15Z","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":"82329a45ea410c28084b1ee5f06ee4a563b6e0df7ffbe2108f986fb2d3fe2b77","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-02T19:06:30Z","title_canon_sha256":"a9049f7b71f0752bb28640f999b2e017005eae7a7bca363fa38b8d6cde4c1d6c"},"schema_version":"1.0","source":{"id":"1901.00509","kind":"arxiv","version":2}},"canonical_sha256":"c3c8167d007b3b1ebc9a4316877f5a032c0ff1d340266689b091b451b8652404","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c3c8167d007b3b1ebc9a4316877f5a032c0ff1d340266689b091b451b8652404","first_computed_at":"2026-05-17T23:54:15.397020Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:54:15.397020Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8BmchoIXq0vKhi9dP0WQyv737dyMFp3HV54ZmE5QIIH8RQJrbQdNVjt9fhK9Ea9QphNYI49aZUudBIIPQHaJAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:54:15.397467Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.00509","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:61f5d76c6f992de96ef64c84d649e5183bff96108203ea9650528205d423798f","sha256:37601795e6616db75616c9b233992fc638f8a667b784f58726cdf6de5246f4f7"],"state_sha256":"7608a155dfce461174b42613878590a4ea04b11764251ab6dad4e0e20187607f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zBs4ul1iJ2e1BOYgAUwY7hB0bCIKq/JMjX+I8/5hkAz6fyy2yOlQDAinXA1z5Kmzzham6NeVR3rlP3DCeSlvAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T10:04:18.778526Z","bundle_sha256":"279057e793fc55dacdc3f92cfd655ffc6910c9e8b95994458934cea02f599da7"}}