{"paper":{"title":"A Massive Cluster at z = 0.288 Caught in the Process of Formation: The Case of Abell 959","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"(2) INAF-Istituto di Radioastronomia, (3) Leiden Observatory, 4), (4) International Centre for Radio Astronomy Research -- Curtin University, (5) Harvard-Smithsonian Center for Astrophysics, 6), (6) Dipartimento di Fisica e Astronomia, (7) ASTRON), A. Botteon (2, D. A. Rafferty (1), F. Andrade-Santos (5), F. de Gasperin (1), G. Brunetti (2), H. J. A. R\\\"ottgering (3), H. T. Intema (3, L. B\\^irzan (1), Leiden University, M. Br\\\"uggen (1), R. Cassano (2), R. J. van Weeren (3), T. W. Shimwell (7) ((1) Hamburger Sternwarte, Universit\\`a di Bologna, Universit\\\"at Hamburg","submitted_at":"2019-05-24T11:31:54Z","abstract_excerpt":"The largest galaxy clusters are observed still to be forming through major cluster-cluster mergers, often showing observational signatures such as radio relics and giant radio haloes. Using LOFAR Two-meter Sky Survey data, we present new detections of both a radio halo (with a spectral index of $\\alpha_{143}^{1400}=1.48^{+0.06}_{-0.23}$) and a likely radio relic in Abell 959, a massive cluster at a redshift of z=0.288. Using a sample of clusters with giant radio haloes from the literature (80 in total), we show that the radio halo in A959 lies reasonably well on the scaling relations between t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.10156","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"}