{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:AC4MD2PI4JZYMWKMATHSTI7Y3O","short_pith_number":"pith:AC4MD2PI","canonical_record":{"source":{"id":"2111.10159","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-11-19T11:19:33Z","cross_cats_sorted":[],"title_canon_sha256":"5aecfef76975f8c798b4ec42ee3e63f0f20428c718bc5c0a761a94d2223dcf74","abstract_canon_sha256":"f75dc3c6d880bee4853af1de8bb50b32bde15ea777cf8f140e2b285149381f32"},"schema_version":"1.0"},"canonical_sha256":"00b8c1e9e8e27386594c04cf29a3f8dbbc933745512c364443d93b3d7748dedd","source":{"kind":"arxiv","id":"2111.10159","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.10159","created_at":"2026-07-05T03:38:41Z"},{"alias_kind":"arxiv_version","alias_value":"2111.10159v2","created_at":"2026-07-05T03:38:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.10159","created_at":"2026-07-05T03:38:41Z"},{"alias_kind":"pith_short_12","alias_value":"AC4MD2PI4JZY","created_at":"2026-07-05T03:38:41Z"},{"alias_kind":"pith_short_16","alias_value":"AC4MD2PI4JZYMWKM","created_at":"2026-07-05T03:38:41Z"},{"alias_kind":"pith_short_8","alias_value":"AC4MD2PI","created_at":"2026-07-05T03:38:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:AC4MD2PI4JZYMWKMATHSTI7Y3O","target":"record","payload":{"canonical_record":{"source":{"id":"2111.10159","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-11-19T11:19:33Z","cross_cats_sorted":[],"title_canon_sha256":"5aecfef76975f8c798b4ec42ee3e63f0f20428c718bc5c0a761a94d2223dcf74","abstract_canon_sha256":"f75dc3c6d880bee4853af1de8bb50b32bde15ea777cf8f140e2b285149381f32"},"schema_version":"1.0"},"canonical_sha256":"00b8c1e9e8e27386594c04cf29a3f8dbbc933745512c364443d93b3d7748dedd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:38:41.512354Z","signature_b64":"U1Gjx5ADDMjhBHlMrDNwySevEZ58qV0UixilhbQfp8bDToIsRvAinTV+QClWzHPS8zTqQRGS/T40T8O+fG5uDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"00b8c1e9e8e27386594c04cf29a3f8dbbc933745512c364443d93b3d7748dedd","last_reissued_at":"2026-07-05T03:38:41.511948Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:38:41.511948Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2111.10159","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":"2026-07-05T03:38:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"absaz5jVsLLRNT6nZOedgKLTMWF1HUHmAhQJ+MkfBpmUjYXgyvpamxoH1zUbeeKZeMnLdd1F+/sLbn3Wy/faBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T23:26:55.050625Z"},"content_sha256":"9e34c1a692e7aaa21a13fcfd002b687d0338fbc5b4001cd49e4c2c30cebfa6a6","schema_version":"1.0","event_id":"sha256:9e34c1a692e7aaa21a13fcfd002b687d0338fbc5b4001cd49e4c2c30cebfa6a6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:AC4MD2PI4JZYMWKMATHSTI7Y3O","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"MeerKAT discovery of radio emission from the Vela X-1 bow shock","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"G. R. Sivakoff, I. Heywood, J. C. A. Miller-Jones, J. van den Eijnden, P. A. Woudt, P. Saikia, R. Fender, S. Mohamed, S. Motta, T. D. Russell","submitted_at":"2021-11-19T11:19:33Z","abstract_excerpt":"Vela X-1 is a runaway X-ray binary system hosting a massive donor star, whose strong stellar wind creates a bow shock as it interacts with the interstellar medium. This bow shock has previously been detected in H$\\alpha$ and IR, but, similar to all but one bow shock from a massive runaway star (BD+43$^{\\rm o}$3654), has escaped detection in other wavebands. We report on the discovery of $1.3$ GHz radio emission from the Vela X-1 bow shock with the MeerKAT telescope. The MeerKAT observations reveal how the radio emission closely traces the H$\\alpha$ line emission, both in the bow shock and in t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.10159","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2111.10159/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":"2026-07-05T03:38:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SFp5RGb+ZbuJAynFn5SpHerYt5qmaQOUw2j8MFL1kYXm+tAp4Wl4JLEL9rXfVeJUTdNnJclFOWI8C6amvsykDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T23:26:55.051178Z"},"content_sha256":"386ff32fe3d16d619e4b73b953a8e64273ffc7d013b3d777d373a7243437c939","schema_version":"1.0","event_id":"sha256:386ff32fe3d16d619e4b73b953a8e64273ffc7d013b3d777d373a7243437c939"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AC4MD2PI4JZYMWKMATHSTI7Y3O/bundle.json","state_url":"https://pith.science/pith/AC4MD2PI4JZYMWKMATHSTI7Y3O/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AC4MD2PI4JZYMWKMATHSTI7Y3O/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":"2026-08-02T23:26:55Z","links":{"resolver":"https://pith.science/pith/AC4MD2PI4JZYMWKMATHSTI7Y3O","bundle":"https://pith.science/pith/AC4MD2PI4JZYMWKMATHSTI7Y3O/bundle.json","state":"https://pith.science/pith/AC4MD2PI4JZYMWKMATHSTI7Y3O/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AC4MD2PI4JZYMWKMATHSTI7Y3O/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:AC4MD2PI4JZYMWKMATHSTI7Y3O","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":"f75dc3c6d880bee4853af1de8bb50b32bde15ea777cf8f140e2b285149381f32","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-11-19T11:19:33Z","title_canon_sha256":"5aecfef76975f8c798b4ec42ee3e63f0f20428c718bc5c0a761a94d2223dcf74"},"schema_version":"1.0","source":{"id":"2111.10159","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2111.10159","created_at":"2026-07-05T03:38:41Z"},{"alias_kind":"arxiv_version","alias_value":"2111.10159v2","created_at":"2026-07-05T03:38:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2111.10159","created_at":"2026-07-05T03:38:41Z"},{"alias_kind":"pith_short_12","alias_value":"AC4MD2PI4JZY","created_at":"2026-07-05T03:38:41Z"},{"alias_kind":"pith_short_16","alias_value":"AC4MD2PI4JZYMWKM","created_at":"2026-07-05T03:38:41Z"},{"alias_kind":"pith_short_8","alias_value":"AC4MD2PI","created_at":"2026-07-05T03:38:41Z"}],"graph_snapshots":[{"event_id":"sha256:386ff32fe3d16d619e4b73b953a8e64273ffc7d013b3d777d373a7243437c939","target":"graph","created_at":"2026-07-05T03:38:41Z","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/2111.10159/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Vela X-1 is a runaway X-ray binary system hosting a massive donor star, whose strong stellar wind creates a bow shock as it interacts with the interstellar medium. This bow shock has previously been detected in H$\\alpha$ and IR, but, similar to all but one bow shock from a massive runaway star (BD+43$^{\\rm o}$3654), has escaped detection in other wavebands. We report on the discovery of $1.3$ GHz radio emission from the Vela X-1 bow shock with the MeerKAT telescope. The MeerKAT observations reveal how the radio emission closely traces the H$\\alpha$ line emission, both in the bow shock and in t","authors_text":"G. R. Sivakoff, I. Heywood, J. C. A. Miller-Jones, J. van den Eijnden, P. A. Woudt, P. Saikia, R. Fender, S. Mohamed, S. Motta, T. D. Russell","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-11-19T11:19:33Z","title":"MeerKAT discovery of radio emission from the Vela X-1 bow shock"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.10159","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":"sha256:9e34c1a692e7aaa21a13fcfd002b687d0338fbc5b4001cd49e4c2c30cebfa6a6","target":"record","created_at":"2026-07-05T03:38:41Z","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":"f75dc3c6d880bee4853af1de8bb50b32bde15ea777cf8f140e2b285149381f32","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2021-11-19T11:19:33Z","title_canon_sha256":"5aecfef76975f8c798b4ec42ee3e63f0f20428c718bc5c0a761a94d2223dcf74"},"schema_version":"1.0","source":{"id":"2111.10159","kind":"arxiv","version":2}},"canonical_sha256":"00b8c1e9e8e27386594c04cf29a3f8dbbc933745512c364443d93b3d7748dedd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"00b8c1e9e8e27386594c04cf29a3f8dbbc933745512c364443d93b3d7748dedd","first_computed_at":"2026-07-05T03:38:41.511948Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:38:41.511948Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"U1Gjx5ADDMjhBHlMrDNwySevEZ58qV0UixilhbQfp8bDToIsRvAinTV+QClWzHPS8zTqQRGS/T40T8O+fG5uDA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:38:41.512354Z","signed_message":"canonical_sha256_bytes"},"source_id":"2111.10159","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9e34c1a692e7aaa21a13fcfd002b687d0338fbc5b4001cd49e4c2c30cebfa6a6","sha256:386ff32fe3d16d619e4b73b953a8e64273ffc7d013b3d777d373a7243437c939"],"state_sha256":"5dbd9e6a502dc37f43a035d69c4c827f5e41dc1e877f67fd5eb797c54e0028c2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RJ+93Cn0nGFITJ2R2eo9oqnrAVnWGMK8AAnaJS8dJr873xBidO16n8rBhAOYOc6sIFAIn1o0iOnkAQtTn/hcAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-02T23:26:55.057064Z","bundle_sha256":"a5ef70bdc939a1978645ea20ffd457ac5b2255af011cea1e52e3b59572b92a13"}}