{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2004:PUYLW3IELGKIA2VVBWAAD7IZQX","short_pith_number":"pith:PUYLW3IE","canonical_record":{"source":{"id":"astro-ph/0401157","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-01-09T16:46:07Z","cross_cats_sorted":[],"title_canon_sha256":"2a885850495407e0059f31c99fa8377c5ea06847cbbc2c4af169a2d4e91b456f","abstract_canon_sha256":"4638d0b49057c0bb9b7707bbd0efe3b545a5fe000ae13d9e1adae269cb3e53da"},"schema_version":"1.0"},"canonical_sha256":"7d30bb6d045994806ab50d8001fd1985ff57a3914b2941eb5566e9b582bf36a8","source":{"kind":"arxiv","id":"astro-ph/0401157","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0401157","created_at":"2026-07-04T16:42:48Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0401157v1","created_at":"2026-07-04T16:42:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0401157","created_at":"2026-07-04T16:42:48Z"},{"alias_kind":"pith_short_12","alias_value":"PUYLW3IELGKI","created_at":"2026-07-04T16:42:48Z"},{"alias_kind":"pith_short_16","alias_value":"PUYLW3IELGKIA2VV","created_at":"2026-07-04T16:42:48Z"},{"alias_kind":"pith_short_8","alias_value":"PUYLW3IE","created_at":"2026-07-04T16:42:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2004:PUYLW3IELGKIA2VVBWAAD7IZQX","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0401157","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-01-09T16:46:07Z","cross_cats_sorted":[],"title_canon_sha256":"2a885850495407e0059f31c99fa8377c5ea06847cbbc2c4af169a2d4e91b456f","abstract_canon_sha256":"4638d0b49057c0bb9b7707bbd0efe3b545a5fe000ae13d9e1adae269cb3e53da"},"schema_version":"1.0"},"canonical_sha256":"7d30bb6d045994806ab50d8001fd1985ff57a3914b2941eb5566e9b582bf36a8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:42:48.224728Z","signature_b64":"CxN8B2q1cDknk09cjbFoeDNu50cEgtinoVEpewlLv0Ouua6eWcytogRa2Bunl4L/3IUsj8VtN1m/5OQ3FtTQDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7d30bb6d045994806ab50d8001fd1985ff57a3914b2941eb5566e9b582bf36a8","last_reissued_at":"2026-07-04T16:42:48.224233Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:42:48.224233Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0401157","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":"2026-07-04T16:42:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gl+jK1twmAnQuQWQ+RVd4sCMWxcXStFFp+oTM+Ugew3FoWIkUuB9R4MouoEYJFUpYPh54yKiy22XnpauFREFBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T06:38:56.066906Z"},"content_sha256":"ece0a6700cd75d69ee3cc7cb0f8643ab43303c2e84997ee6737ac16b14965824","schema_version":"1.0","event_id":"sha256:ece0a6700cd75d69ee3cc7cb0f8643ab43303c2e84997ee6737ac16b14965824"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2004:PUYLW3IELGKIA2VVBWAAD7IZQX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Magnetic fields in merging spirals - the Antennae","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2), Bonn, Germany), Jagiellonian University, Krakow, Krzysztof T. Chyzy (1), MPI fuer Radioastronomie, Poland, Rainer Beck (2) ((1) Astr. Obs.","submitted_at":"2004-01-09T16:46:07Z","abstract_excerpt":"We present an extensive study of magnetic fields in a system of merging galaxies. We obtained for NGC4038/39 (the Antennae) radio total intensity and polarization maps at 8.44, 4.86 and 1.49GHz using the VLA in the C and D configurations. The radio thermal fraction was found to be about 50% at 10.45GHz, higher than in normal spirals. The mean total magnetic fields in both galaxies are about two times stronger (20microG) than in normal spirals. However,the degree of field regularity is rather low, implying tangling of the regular component in regions with interaction-enhanced star formation. Ou"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0401157","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/0401157/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":"2026-07-04T16:42:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"s3oATvkuVLLh1XN4aGdC75wCXhkedNt+PT7sWhIxFOrC1GQHfmxvXh7pXcCo4sf/MgfqfMnXQdDJAUOx86fXAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T06:38:56.067289Z"},"content_sha256":"f60f084f69c9d0962556917f49b4cd930bcb968c3f647fd2862c9d470c535e17","schema_version":"1.0","event_id":"sha256:f60f084f69c9d0962556917f49b4cd930bcb968c3f647fd2862c9d470c535e17"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PUYLW3IELGKIA2VVBWAAD7IZQX/bundle.json","state_url":"https://pith.science/pith/PUYLW3IELGKIA2VVBWAAD7IZQX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PUYLW3IELGKIA2VVBWAAD7IZQX/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":"2026-07-07T06:38:56Z","links":{"resolver":"https://pith.science/pith/PUYLW3IELGKIA2VVBWAAD7IZQX","bundle":"https://pith.science/pith/PUYLW3IELGKIA2VVBWAAD7IZQX/bundle.json","state":"https://pith.science/pith/PUYLW3IELGKIA2VVBWAAD7IZQX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PUYLW3IELGKIA2VVBWAAD7IZQX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:PUYLW3IELGKIA2VVBWAAD7IZQX","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":"4638d0b49057c0bb9b7707bbd0efe3b545a5fe000ae13d9e1adae269cb3e53da","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2004-01-09T16:46:07Z","title_canon_sha256":"2a885850495407e0059f31c99fa8377c5ea06847cbbc2c4af169a2d4e91b456f"},"schema_version":"1.0","source":{"id":"astro-ph/0401157","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0401157","created_at":"2026-07-04T16:42:48Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0401157v1","created_at":"2026-07-04T16:42:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0401157","created_at":"2026-07-04T16:42:48Z"},{"alias_kind":"pith_short_12","alias_value":"PUYLW3IELGKI","created_at":"2026-07-04T16:42:48Z"},{"alias_kind":"pith_short_16","alias_value":"PUYLW3IELGKIA2VV","created_at":"2026-07-04T16:42:48Z"},{"alias_kind":"pith_short_8","alias_value":"PUYLW3IE","created_at":"2026-07-04T16:42:48Z"}],"graph_snapshots":[{"event_id":"sha256:f60f084f69c9d0962556917f49b4cd930bcb968c3f647fd2862c9d470c535e17","target":"graph","created_at":"2026-07-04T16:42:48Z","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/0401157/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present an extensive study of magnetic fields in a system of merging galaxies. We obtained for NGC4038/39 (the Antennae) radio total intensity and polarization maps at 8.44, 4.86 and 1.49GHz using the VLA in the C and D configurations. The radio thermal fraction was found to be about 50% at 10.45GHz, higher than in normal spirals. The mean total magnetic fields in both galaxies are about two times stronger (20microG) than in normal spirals. However,the degree of field regularity is rather low, implying tangling of the regular component in regions with interaction-enhanced star formation. Ou","authors_text":"(2), Bonn, Germany), Jagiellonian University, Krakow, Krzysztof T. Chyzy (1), MPI fuer Radioastronomie, Poland, Rainer Beck (2) ((1) Astr. Obs.","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2004-01-09T16:46:07Z","title":"Magnetic fields in merging spirals - the Antennae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0401157","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:ece0a6700cd75d69ee3cc7cb0f8643ab43303c2e84997ee6737ac16b14965824","target":"record","created_at":"2026-07-04T16:42:48Z","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":"4638d0b49057c0bb9b7707bbd0efe3b545a5fe000ae13d9e1adae269cb3e53da","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2004-01-09T16:46:07Z","title_canon_sha256":"2a885850495407e0059f31c99fa8377c5ea06847cbbc2c4af169a2d4e91b456f"},"schema_version":"1.0","source":{"id":"astro-ph/0401157","kind":"arxiv","version":1}},"canonical_sha256":"7d30bb6d045994806ab50d8001fd1985ff57a3914b2941eb5566e9b582bf36a8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7d30bb6d045994806ab50d8001fd1985ff57a3914b2941eb5566e9b582bf36a8","first_computed_at":"2026-07-04T16:42:48.224233Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:42:48.224233Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CxN8B2q1cDknk09cjbFoeDNu50cEgtinoVEpewlLv0Ouua6eWcytogRa2Bunl4L/3IUsj8VtN1m/5OQ3FtTQDw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:42:48.224728Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0401157","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ece0a6700cd75d69ee3cc7cb0f8643ab43303c2e84997ee6737ac16b14965824","sha256:f60f084f69c9d0962556917f49b4cd930bcb968c3f647fd2862c9d470c535e17"],"state_sha256":"2a85c90d27218eca84df773c827f9be2c56e5af4eab46d96375af6c8cecaf8cc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9gQHhtMTFA9gcvDN9RDAbr1N1gb8fvWFOCr+BdQQsoeyT0Tuw5bV0I655xMl4xX1r0zwyDQSwVGUsR+pynqMDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T06:38:56.069678Z","bundle_sha256":"14cfd533f6ac8722155d2a3cf06fabd8ec6a212bdf15e496ba2489329bd94552"}}