{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:O2TTBLP6UBXP7QZMZ4GUF43YGW","short_pith_number":"pith:O2TTBLP6","canonical_record":{"source":{"id":"1704.01576","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-04-05T18:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"f2435249b266e2bafd801e2333733c59b435662b6e52dfebc7806e1c2c4e88aa","abstract_canon_sha256":"aef7b5837af205f2df57b009c35b8ad682cb30f567d368291c6853037289aa8d"},"schema_version":"1.0"},"canonical_sha256":"76a730adfea06effc32ccf0d42f37835a480892678c322321334982c9dcdead5","source":{"kind":"arxiv","id":"1704.01576","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1704.01576","created_at":"2026-05-18T00:40:06Z"},{"alias_kind":"arxiv_version","alias_value":"1704.01576v1","created_at":"2026-05-18T00:40:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1704.01576","created_at":"2026-05-18T00:40:06Z"},{"alias_kind":"pith_short_12","alias_value":"O2TTBLP6UBXP","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_16","alias_value":"O2TTBLP6UBXP7QZM","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_8","alias_value":"O2TTBLP6","created_at":"2026-05-18T12:31:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:O2TTBLP6UBXP7QZMZ4GUF43YGW","target":"record","payload":{"canonical_record":{"source":{"id":"1704.01576","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-04-05T18:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"f2435249b266e2bafd801e2333733c59b435662b6e52dfebc7806e1c2c4e88aa","abstract_canon_sha256":"aef7b5837af205f2df57b009c35b8ad682cb30f567d368291c6853037289aa8d"},"schema_version":"1.0"},"canonical_sha256":"76a730adfea06effc32ccf0d42f37835a480892678c322321334982c9dcdead5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:40:06.404975Z","signature_b64":"ZHKqQ735qZGMVRhnvD/3SDeP/7h9lgTppzbbOuaXIvczXL2P2tuyRqgk6pOiEpM/ERK1gkYfaLNWwqUwrF+2Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"76a730adfea06effc32ccf0d42f37835a480892678c322321334982c9dcdead5","last_reissued_at":"2026-05-18T00:40:06.404381Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:40:06.404381Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1704.01576","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":"2026-05-18T00:40:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FQS6+NgmRJSRkg8xe54OntUediYvxpwpTHmcsOnxeivK20XGuGzKj9LxUdg8BMzzl0SCQbJRBkbf/kKKtws6Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T03:59:04.956748Z"},"content_sha256":"e12d5f59503cea88062d230eb7075678b5488e8431b3c3caf62d8ce22af80547","schema_version":"1.0","event_id":"sha256:e12d5f59503cea88062d230eb7075678b5488e8431b3c3caf62d8ce22af80547"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:O2TTBLP6UBXP7QZMZ4GUF43YGW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"FR-II radio galaxies at low frequencies II: spectral ageing and source dynamics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aleksander Shulevski, Gianfranco Brunetti, Glenn J. White, Huub J. A. R\\\"ottgering, Jeremy J. Harwood, Judith H. Croston, Marcus Br\\\"uggen, Martin J. Hardcastle, Raffaella Morganti","submitted_at":"2017-04-05T18:00:00Z","abstract_excerpt":"In this paper, the second in a series investigating FR II radio galaxies at low frequencies, we use LOFAR and VLA observations between 117 and 456 MHz in addition to archival data to determine the dynamics and energetics of two radio galaxies, 3C452 and 3C223, through fitting of spectral ageing models on small spatial scales. We provide improved measurements for the physical extent of the two sources, including a previously unknown low surface brightness extension to the northern lobe of 3C223, and revised energetics based on these values. We find spectral ages of $77.05^{+9.22}_{-8.74}$ and $"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1704.01576","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":"2026-05-18T00:40:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p3o7vMsXID/14L9ACUzikYQGzGiErjoetbxSKPnc6ODrslWE5pUIeIAW4/kRqSATdZox52PAw1OFhTsFivotAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T03:59:04.957483Z"},"content_sha256":"02fb2cf119dbf74ca95fe17272f4e684b2e0f1322de57c49ecf3d922a41e5905","schema_version":"1.0","event_id":"sha256:02fb2cf119dbf74ca95fe17272f4e684b2e0f1322de57c49ecf3d922a41e5905"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O2TTBLP6UBXP7QZMZ4GUF43YGW/bundle.json","state_url":"https://pith.science/pith/O2TTBLP6UBXP7QZMZ4GUF43YGW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O2TTBLP6UBXP7QZMZ4GUF43YGW/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":"2026-05-30T03:59:04Z","links":{"resolver":"https://pith.science/pith/O2TTBLP6UBXP7QZMZ4GUF43YGW","bundle":"https://pith.science/pith/O2TTBLP6UBXP7QZMZ4GUF43YGW/bundle.json","state":"https://pith.science/pith/O2TTBLP6UBXP7QZMZ4GUF43YGW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O2TTBLP6UBXP7QZMZ4GUF43YGW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:O2TTBLP6UBXP7QZMZ4GUF43YGW","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":"aef7b5837af205f2df57b009c35b8ad682cb30f567d368291c6853037289aa8d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-04-05T18:00:00Z","title_canon_sha256":"f2435249b266e2bafd801e2333733c59b435662b6e52dfebc7806e1c2c4e88aa"},"schema_version":"1.0","source":{"id":"1704.01576","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1704.01576","created_at":"2026-05-18T00:40:06Z"},{"alias_kind":"arxiv_version","alias_value":"1704.01576v1","created_at":"2026-05-18T00:40:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1704.01576","created_at":"2026-05-18T00:40:06Z"},{"alias_kind":"pith_short_12","alias_value":"O2TTBLP6UBXP","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_16","alias_value":"O2TTBLP6UBXP7QZM","created_at":"2026-05-18T12:31:34Z"},{"alias_kind":"pith_short_8","alias_value":"O2TTBLP6","created_at":"2026-05-18T12:31:34Z"}],"graph_snapshots":[{"event_id":"sha256:02fb2cf119dbf74ca95fe17272f4e684b2e0f1322de57c49ecf3d922a41e5905","target":"graph","created_at":"2026-05-18T00:40:06Z","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":"In this paper, the second in a series investigating FR II radio galaxies at low frequencies, we use LOFAR and VLA observations between 117 and 456 MHz in addition to archival data to determine the dynamics and energetics of two radio galaxies, 3C452 and 3C223, through fitting of spectral ageing models on small spatial scales. We provide improved measurements for the physical extent of the two sources, including a previously unknown low surface brightness extension to the northern lobe of 3C223, and revised energetics based on these values. We find spectral ages of $77.05^{+9.22}_{-8.74}$ and $","authors_text":"Aleksander Shulevski, Gianfranco Brunetti, Glenn J. White, Huub J. A. R\\\"ottgering, Jeremy J. Harwood, Judith H. Croston, Marcus Br\\\"uggen, Martin J. Hardcastle, Raffaella Morganti","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-04-05T18:00:00Z","title":"FR-II radio galaxies at low frequencies II: spectral ageing and source dynamics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1704.01576","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:e12d5f59503cea88062d230eb7075678b5488e8431b3c3caf62d8ce22af80547","target":"record","created_at":"2026-05-18T00:40:06Z","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":"aef7b5837af205f2df57b009c35b8ad682cb30f567d368291c6853037289aa8d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-04-05T18:00:00Z","title_canon_sha256":"f2435249b266e2bafd801e2333733c59b435662b6e52dfebc7806e1c2c4e88aa"},"schema_version":"1.0","source":{"id":"1704.01576","kind":"arxiv","version":1}},"canonical_sha256":"76a730adfea06effc32ccf0d42f37835a480892678c322321334982c9dcdead5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"76a730adfea06effc32ccf0d42f37835a480892678c322321334982c9dcdead5","first_computed_at":"2026-05-18T00:40:06.404381Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:40:06.404381Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZHKqQ735qZGMVRhnvD/3SDeP/7h9lgTppzbbOuaXIvczXL2P2tuyRqgk6pOiEpM/ERK1gkYfaLNWwqUwrF+2Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:40:06.404975Z","signed_message":"canonical_sha256_bytes"},"source_id":"1704.01576","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e12d5f59503cea88062d230eb7075678b5488e8431b3c3caf62d8ce22af80547","sha256:02fb2cf119dbf74ca95fe17272f4e684b2e0f1322de57c49ecf3d922a41e5905"],"state_sha256":"6a64453899ec59aeccfeafd2794461c50dfb1fab2d8e5bff24011bfca39a20c6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4jmRMJGSchHA0M5u8Cg+srlGeXANMy4e2qGhf2u+1xrnZESS+PN0tJYJQ/sImMsYQWn9snMHXo/wp8fZTw3jAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T03:59:04.961592Z","bundle_sha256":"b24dd42123991b83973c647425a5f4ea75ec49d0d20c483635a469a363e95277"}}