{"paper":{"title":"uGMRT and MeerKAT observation of RXCJ0232-4420: a quiet cluster with a giant radio halo","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"A cool-core galaxy cluster hosts an Mpc-scale giant radio halo sustained by minor-merger turbulence.","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Pralay Biswas, Ramananda Santra, Ruta Kale, Viral Parekh","submitted_at":"2026-04-29T19:23:16Z","abstract_excerpt":"Giant radio halos are the Mpc-scale extended sources associated with the merging clusters, while the mini-halos are preferentially associated with cool-core clusters. Both trace the ICM plasma physical process, and recent low-frequency observations increasingly blur the distinction between the two classes. We present the first multi-frequency spectral analysis of the galaxy cluster RXCJ0232--4420, hosting a cool core, using uGMRT (400 and 650 MHz) and MeerKAT (1283 MHz) observations. The central radio emission extends beyond $\\sim 1$ Mpc at all frequencies, confirming it as a giant radio halo."},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The presence of Mpc-scale emission in the cool-core cluster shows that such emission can arise in dynamically intermediate systems. Our results demonstrate that merger-driven turbulence, even from minor disturbances, can sustain cluster-wide particle re-acceleration without destroying the cool core.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the observed Mpc-scale radio emission is powered by merger-driven turbulence from minor disturbances rather than other mechanisms, and that the cluster's dynamical state is truly intermediate based on the survival of the cool core.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A cool-core cluster hosts a giant radio halo with uniform spectral index and sublinear radio-X-ray correlation, indicating minor-merger turbulence can sustain Mpc-scale re-acceleration without destroying the core.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A cool-core galaxy cluster hosts an Mpc-scale giant radio halo sustained by minor-merger turbulence.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"a6a169ef5313565ca6a0ed9926ca184cdf0a4be11481204e5a08d7407c942114"},"source":{"id":"2604.27123","kind":"arxiv","version":2},"verdict":{"id":"08d2e2fc-645e-4417-9ba9-3e3e1b45e878","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-07T09:16:18.048662Z","strongest_claim":"The presence of Mpc-scale emission in the cool-core cluster shows that such emission can arise in dynamically intermediate systems. Our results demonstrate that merger-driven turbulence, even from minor disturbances, can sustain cluster-wide particle re-acceleration without destroying the cool core.","one_line_summary":"A cool-core cluster hosts a giant radio halo with uniform spectral index and sublinear radio-X-ray correlation, indicating minor-merger turbulence can sustain Mpc-scale re-acceleration without destroying the core.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the observed Mpc-scale radio emission is powered by merger-driven turbulence from minor disturbances rather than other mechanisms, and that the cluster's dynamical state is truly intermediate based on the survival of the cool core.","pith_extraction_headline":"A cool-core galaxy cluster hosts an Mpc-scale giant radio halo sustained by minor-merger turbulence."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.27123/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"ai_meta_artifact","ran_at":"2026-05-20T22:43:58.446791Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T19:33:34.162585Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"0a2cf94e28d961803973f58eb9fcd8917966fede9929b53d695ee8f2c1c16861"},"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"}