The most distant evolved galaxy cluster
<p><a href="/Images/News/2457/eso1108b.jpg" target="_blank"><img style="border: 0px solid; margin: 0 8px 5px 0;" src="/Images/News/2457/eso1108b.jpg" alt="img" width="120" align="left" /></a>An international team led by Raphael Gobat and Emanuele Daddi at the <a href="http://irfu.cea.fr/Sap">Service d'Astrophysique-AIM</a> of <a href="http://irfu.cea.fr">CEA-Irfu </a>has discovered the most distant evolved galaxy cluster ever observed at a distance of more than ten billion light-years. The nature and distance of this cluster labelled CL J1449+0856, were determined thanks to the joint use of the ground-based telescopes at <a href="http://www.eso.org/">VLT (ESO)</a> and of the satellites <a href="http://hubblesite.org/" target="_blank">HST (NASA-ESA)</a> and <a href="http://irfu.cea.fr/Sap/Phocea/Vie_des_labos/Ast/ast_technique.php?id_ast=1028">XMM-Newton (ESA)</a>. This discovery shows surprisingly that fully formed large groups of galaxies already existed when the Universe was less than one quarter of its current age.</p>
<p>"A mature cluster with X-ray emission at z = 2.07"<br />R. Gobat et al. (2011) publié dans Astronomy & Astrophysics <em></em>( <a href="/Images/News/2457/aa16084-10.pdf"><img src="/Phocea/Images/pdf.gif" border="0" alt="" /> ficher PDF</a>)</p>
<p>see also : <a href="http://www.cea.fr/le_cea/actualites/record_distance_amas_galaxies_evolue-53941" target="_blank">the CEA press release</a> (in french)</p>
<p><a href="http://www.eso.org/public/news/eso1108/" target="_blank"> the ESO (European Southern Observatory) press release </a></p>
<p> <a href="http://www.insu.cnrs.fr/co/univers/extragalactique-et-univers/l-amas-de-galaxies-evolue-le-plus-eloigne" target="_blank">the CNRS-INSU press release</a></p>
J. Bonnet-bidaud, 2011-03-10 00:00:00
