{"paper":{"title":"Discovery and Cosmological Implications of SPT-CL J2106-5844, the Most Massive Known Cluster at z > 1","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. A. Stark, A. Clocchiatti, A. H. Gonzalez, A. Rest, A. Saro, A. T. Crites, A. T. Lee, A. Vikhlinin, A. Zenteno, B. A. Benson, B. R. Saliwanchik, B. Stalder, C. Jones, C. L. Chang, C. L. Reichardt, C. Pryke, C. W. Stubbs, D. Luong-Van, D. P. Marrone, E. M. George, E. M. Leitch, E. Shirokoff, F. W. High, G. Bazin, G. Garmire, G. G. Fazio, G. P. Holder, H. G. Spieler, J. D. Hrubes, J. D. Vieira, J. E. Carlstrom, J. E. Ruhl, J. J. McMahon, J. J. Mohr, J. Mehl, J. P. Dudley, J. Ruel, J. Song, K. A. Aird, K. Andersson, K. K. Schaffer, K. Story, K. Vanderlinde, L. E. Bleem, L. Knox, L. Shaw, M. A. Dobbs, M. Bautz, M. Bonamente, M. Brodwin, M. D. Gladders, M. Joy, M. L. N. Ashby, M. Lueker, N. W. Halverson, P. A. R. Ade, R. Armstrong, R. J. Foley, R. Keisler, R. Williamson, S. A. Stanford, S. Desai, S. Hoover, S. Padin, S. S. Meyer, S. S. Murray, T. de Haan, T. E. Montroy, T. M. Crawford, T. Plagge, W. L. Holzapfel, W. R. Forman, Z. Staniszewski","submitted_at":"2011-01-06T20:23:55Z","abstract_excerpt":"Using the South Pole Telescope (SPT), we have discovered the most massive known galaxy cluster at z > 1, SPT-CL J2106-5844. In addition to producing a strong Sunyaev-Zel'dovich effect signal, this system is a luminous X-ray source and its numerous constituent galaxies display spatial and color clustering, all indicating the presence of a massive galaxy cluster. VLT and Magellan spectroscopy of 18 member galaxies shows that the cluster is at z = 1.132^+0.002_-0.003. Chandra observations obtained through a combined HRC-ACIS GTO program reveal an X-ray spectrum with an Fe K line redshifted by z ="},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.1286","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"}