A z=0.9 supercluster of X-ray luminous, optically selected, massive galaxy clusters
We report the discovery of a compact supercluster structure at z = 0.9. The structure comprises three optically selected clusters, all of which are detected in X-rays and spectroscopically confirmed to lie at the same redshift. The Chandra X-ray temperatures imply individual masses of âˆ¼5 Ã— 10 14 MâŠ™. The X-ray masses are consistent with those inferred from optical-X-ray scaling relations established at lower redshift. A strongly lensed z âˆ¼ 4 Lyman break galaxy behind one of the clusters allows a strong-lensing mass to be estimated for this cluster, which is in good agreement with the X-ray measurement. Optical spectroscopy of this cluster gives a dynamical mass in good agreement with the other independent mass estimates. The three components of the RCS 2319+00 supercluster are separated from their nearest neighbor by a mere <3 Mpc in the plane of the sky and likely <10 Mpc along the line of sight, and we interpret this structure as the high-redshift antecedent of massive (âˆ¼1015 MâŠ™) z âˆ¼ 0.5 clusters such as MS 0451.5-0305. Â© 2008. The American Astronomical Society. All right reserved.
|Título según WOS:||A z=0.9 supercluster of X-ray luminous, optically selected, massive galaxy clusters|
|Título según SCOPUS:||A z = 0.9 supercluster of X-ray luminous, optically selected, massive galaxy clusters|
|Título de la Revista:||ASTROPHYSICAL JOURNAL|
|Editorial:||IOP PUBLISHING LTD|
|Fecha de publicación:||2008|
|Página de inicio:||L89|