Ulmer, M. P. and Adami, C. and Lima Neto, G. B. and Durret, F. and Covone, G. and Ilbert, O. and Cypriano, E. S. and Allam, S. S. and Kron, R. G. and Mahoney, W. A. and Gavazzi, R. (2009) Cluster and cluster galaxy evolution history from IR to X-ray observations of the young cluster RX J1257.2+4738 at z = 0.866. Astronomy and Astrophysics, 503 (2). pp. 399-408. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20091002-094751455
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Context. The cosmic time around the z ~ 1 redshift range appears crucial in the cluster and galaxy evolution, since it is probably the epoch of the first mature galaxy clusters. Our knowledge of the properties of the galaxy populations in these clusters is limited because only a handful of z ~ 1 clusters are presently known. Aims. In this framework, we report the discovery of a z ~ 0.87 cluster and study its properties at various wavelengths. Methods. We gathered X-ray and optical data (imaging and spectroscopy), and near and far infrared data (imaging) in order to confirm the cluster nature of our candidate, to determine its dynamical state, and to give insight on its galaxy population evolution. Results. Our candidate structure appears to be a massive z ~ 0.87 dynamically young cluster with an atypically high X-ray temperature as compared to its X-ray luminosity. It exhibits a significant percentage (~90%) of galaxies that are also detected in the 24 m band. Conclusions. The cluster RXJ1257.2+4738 appears to be still in the process of collapsing. Its relatively high temperature is probably the consequence of significant energy input into the intracluster medium besides the regular gravitational infall contribution. A significant part of its galaxies are red objects that are probably dusty with on-going star formation.
|Additional Information:||© ESO 2009. Received 23 September 2008; accepted 30 June 2009. The authors thank the referee for useful remarks. We are grateful to the CFHT and Terapix teams. We acknowledge financial support from CNES and PNG, CNRS/INSU, and from the CAPES/COFECUB French-Brazilian cooperation. G.B.L.N. acknowledges support from the CNPq and FAPESP. M.P.U. acknowledges the support of NASA grants GO7- 8144X//NAS8-03060, GO7-8144X//NAS8-03060, and Agmt.# 1306461 NASA NMO710076. We thank the groups and many individuals responsible for the successful launch and operation of Chandra, XMM-Newton, and Spitzer and for helping us set up our observations. We wish to thank Alberto Noriega-Crespo for assistance with the MIPS post pipeline data reduction. Last but not least, we thank Emeric Le Floc’h for useful discussions.|
|Subject Keywords:||galaxies: clusters: individual: RX J1257.2+4738; galaxies: clusters: general; Galaxy: evolution|
|Official Citation:||Cluster and cluster galaxy evolution history from IR to X-ray observations of the young cluster RX J1257.2+4738 at z = 0.866 M. P. Ulmer, C. Adami, G. B. Lima Neto, F. Durret, G. Covone, O. Ilbert, E. S. Cypriano, S. S. Allam, R. G. Kron, W. A. Mahoney and R. Gavazzi A&A 503 (2) 399-408 (2009) DOI: 10.1051/0004-6361/200811021|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||02 Oct 2009 17:51|
|Last Modified:||26 Dec 2012 11:26|
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