{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2024:WH6YDQTPNK6UOV6RQY4PCRFNLU","short_pith_number":"pith:WH6YDQTP","schema_version":"1.0","canonical_sha256":"b1fd81c26f6abd4757d18638f144ad5d3c27a10df6703fe5ffd7c8c274c82989","source":{"kind":"arxiv","id":"2405.00772","version":1},"attestation_state":"computed","paper":{"title":"Abell 0399-Abell 0401 radio bridge spectral index: the first multifrequency detection","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. Bonafede, A. Botteon, F. De Gasperin, F. Vazza, G. Bernardi, G. Brunetti, G.V. Pignataro, H.J.A. R\\\"ottgering, J.M.G.H.J. de Jong, M. Br\\\"uggen, N. Biava, R. Cassano, R.J. van Weeren, T. Pasini, T.W. Shimwell","submitted_at":"2024-05-01T18:00:02Z","abstract_excerpt":"Recent low-frequency radio observations at 140 MHz discovered a 3 Mpc-long bridge of diffuse emission connecting the galaxy clusters Abell 0399 and Abell 0401. We present follow-up observations at 60 MHz to constrain the spectral index of the bridge, which so far has only been detected at 140 and 144 MHz. We analysed deep (~18 hours) LOw Frequency ARray (LOFAR) Low Band Antenna (LBA) data at 60 MHz to detect the bridge at very low frequencies. We then conducted a multi-frequency study with LOFAR HBA data at 144 MHz and uGMRT data at 400 MHz. Assuming second-order Fermi mechanisms for the re-ac"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2405.00772","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2024-05-01T18:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"8847af4b4fb1923433040fc8f4b19d98031966d3a03d58633589b34213de8c67","abstract_canon_sha256":"72ff6bf9744780d34074152f4de8e83a1d0efcf2c778213252e522a9a2706ce0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:21:15.718171Z","signature_b64":"AVy8zOlLtQgh8ghcMj//rEgBjNM8MiELQVKdLrVIK6eKULe7HjLUUrCupqZMfumw18KkykXBq1ezoJ7L+anvCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b1fd81c26f6abd4757d18638f144ad5d3c27a10df6703fe5ffd7c8c274c82989","last_reissued_at":"2026-07-05T08:21:15.717681Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:21:15.717681Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Abell 0399-Abell 0401 radio bridge spectral index: the first multifrequency detection","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. Bonafede, A. Botteon, F. De Gasperin, F. Vazza, G. Bernardi, G. Brunetti, G.V. Pignataro, H.J.A. R\\\"ottgering, J.M.G.H.J. de Jong, M. Br\\\"uggen, N. Biava, R. Cassano, R.J. van Weeren, T. Pasini, T.W. Shimwell","submitted_at":"2024-05-01T18:00:02Z","abstract_excerpt":"Recent low-frequency radio observations at 140 MHz discovered a 3 Mpc-long bridge of diffuse emission connecting the galaxy clusters Abell 0399 and Abell 0401. We present follow-up observations at 60 MHz to constrain the spectral index of the bridge, which so far has only been detected at 140 and 144 MHz. We analysed deep (~18 hours) LOw Frequency ARray (LOFAR) Low Band Antenna (LBA) data at 60 MHz to detect the bridge at very low frequencies. We then conducted a multi-frequency study with LOFAR HBA data at 144 MHz and uGMRT data at 400 MHz. Assuming second-order Fermi mechanisms for the re-ac"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2405.00772","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/2405.00772/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2405.00772","created_at":"2026-07-05T08:21:15.717737+00:00"},{"alias_kind":"arxiv_version","alias_value":"2405.00772v1","created_at":"2026-07-05T08:21:15.717737+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2405.00772","created_at":"2026-07-05T08:21:15.717737+00:00"},{"alias_kind":"pith_short_12","alias_value":"WH6YDQTPNK6U","created_at":"2026-07-05T08:21:15.717737+00:00"},{"alias_kind":"pith_short_16","alias_value":"WH6YDQTPNK6UOV6R","created_at":"2026-07-05T08:21:15.717737+00:00"},{"alias_kind":"pith_short_8","alias_value":"WH6YDQTP","created_at":"2026-07-05T08:21:15.717737+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2607.07750","citing_title":"Multi-Wavelength Signatures of a Giant Cometary Radio Halo in MACSJ0417-1154","ref_index":176,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/WH6YDQTPNK6UOV6RQY4PCRFNLU","json":"https://pith.science/pith/WH6YDQTPNK6UOV6RQY4PCRFNLU.json","graph_json":"https://pith.science/api/pith-number/WH6YDQTPNK6UOV6RQY4PCRFNLU/graph.json","events_json":"https://pith.science/api/pith-number/WH6YDQTPNK6UOV6RQY4PCRFNLU/events.json","paper":"https://pith.science/paper/WH6YDQTP"},"agent_actions":{"view_html":"https://pith.science/pith/WH6YDQTPNK6UOV6RQY4PCRFNLU","download_json":"https://pith.science/pith/WH6YDQTPNK6UOV6RQY4PCRFNLU.json","view_paper":"https://pith.science/paper/WH6YDQTP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2405.00772&json=true","fetch_graph":"https://pith.science/api/pith-number/WH6YDQTPNK6UOV6RQY4PCRFNLU/graph.json","fetch_events":"https://pith.science/api/pith-number/WH6YDQTPNK6UOV6RQY4PCRFNLU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/WH6YDQTPNK6UOV6RQY4PCRFNLU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/WH6YDQTPNK6UOV6RQY4PCRFNLU/action/storage_attestation","attest_author":"https://pith.science/pith/WH6YDQTPNK6UOV6RQY4PCRFNLU/action/author_attestation","sign_citation":"https://pith.science/pith/WH6YDQTPNK6UOV6RQY4PCRFNLU/action/citation_signature","submit_replication":"https://pith.science/pith/WH6YDQTPNK6UOV6RQY4PCRFNLU/action/replication_record"}},"created_at":"2026-07-05T08:21:15.717737+00:00","updated_at":"2026-07-05T08:21:15.717737+00:00"}