The X-ray properties of optically selected z > 0.6 clusters in the European Southern Observatory Distant Cluster Survey |
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| Authors: | O Johnson P Best D Zaritsky D Clowe A Aragón-Salamanca C Halliday P Jablonka B Milvang-Jensen R Pelló B M Poggianti G Rudnick R Saglia L Simard S White |
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| Institution: | SUPA, Institute for Astronomy, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ;Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA;School of Physics and Astronomy, University of Nottingham, University Part, Nottingham NG7 2RD;Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy;GEPI CNRS-UMR8111, Observatoire de Paris, section de Meudon, 5 Place Jules Janssen, F-92195 Meudon Cedex, France;Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark;Laboratoire de' Astrophysique, UMR 5572, Observatoire Midi-Pyrenees, 14 Avenue E. Belin, 31400 Toulouse, France;Osservatorio Astronomico, vicolo dell' Osservatorio 5, 35122 Padova, Italy;Max-Plank-Institute fur Astrophysik, Karl-Schwarschilde-Strasse 1, Postfach 1317, D-85741 Garching, Germany;Max-Plank-Institut fur extraterrestrische Physik, Giessenbachstrasses, D-85748 Garching, Germany;Herzberg Institute of Astrophysics, National Research Council of Canada, Victoria, BC V93 2E7, Canada |
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| Abstract: | We present XMM–Newton observations of three optically selected z > 0.6 clusters from the European Southern Observatory (ESO) Distant Cluster Survey (EDisCS), comprising the first results of a planned X-ray survey of the full EDisCS high-redshift sample. The EDisCS clusters were identified in the Las Campanas Distant Cluster Survey as surface brightness fluctuations in the optical sky and their masses and galaxy populations are well described by extensive photometric and spectroscopic observations. We detect two of the three clusters in the X-ray and place a firm upper limit on diffuse emission in the third cluster field. We are able to constrain the X-ray luminosity and temperature of the detected clusters and estimate their masses. We find that the X-ray properties of the detected EDisCS clusters are similar to those of X-ray-selected clusters of comparable mass and – unlike other high-redshift, optically selected clusters – are consistent with the T –σ and L X–σ relations determined from X-ray-selected clusters at low redshift. The X-ray determined mass estimates are generally consistent with those derived from weak-lensing and spectroscopic analyses. These preliminary results suggest that the novel method of optical selection used to construct the EDisCS catalogue may, like selection by X-ray luminosity, be well suited for identification of relaxed, high-redshift clusters whose intracluster medium is in place and stable by z ～ 0.8 . |
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| Keywords: | galaxies: clusters: general X-rays: galaxies: clusters |
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