Volume 513, April 2010
|Number of page(s)||8|
|Published online||29 April 2010|
Letter to the Editor
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: firstname.lastname@example.org
2 Max-Planck-Institut für Extraterrestrische Physik, 85748 Garching, Germany
3 Physics Department and Michigan Center for Theoretical Physics, University of Michigan, 450 Church St, Ann Arbor, MI 48109-1040, USA
4 Department of Physics, Ludwig-Maximilians-Universität, Scheinerstraße 1, 81679 Munich, Germany
5 Excellence Cluster Universe, Boltzmannstr. 2, 85748 Garching, Germany
6 Laboratoire AIM, IRFU/Service d'Astrophysique – CEA/DSM – CNRS – Université Paris Diderot, Bât. 709, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
7 Departamento de Astronomia y Astrofisica, Pontificia Universidad Catolica de Chile, Casilla 306, Santiago, 22, Chile
8 European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany
9 INAF – Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy
Accepted: 1 April 2010
We report on the discovery of the X-ray luminous cluster XMMU J100750.5+125818 at redshift 1.082 based on 19 spectroscopic members. The cluster displays several strong lensing features. SED modeling of the lensed arc features from multicolor imaging with the VLT and the LBT reveals likely redshifts ~2.7 for the most prominent of the lensed background galaxies. Mass estimates are derived for different radii from the velocity dispersion of the cluster members, M200 1.8 × 1014 M, from the X-ray spectral parameters, M500 1.0 × 1014 M, and the largest lensing arc, MSL 2.3 × 1013 M. The projected spatial distribution of cluster galaxies appears to be elongated, and the brightest galaxy lies off center with respect to the X-ray emission, indicating a not yet relaxed structure. XMMU J100750.5+125818 offers excellent diagnostics of the inner mass distribution of a distant cluster with strong and weak lensing, in combination with optical and X-ray spectroscopy.
Key words: galaxies: clusters: individual: XMMU J100750.5+125818 / X-rays: galaxies: clusters
Based on observations made with ESO Telescopes at the La Silla or Paranal Observatories under programs 78.A-0265 and 80.A-0659.
Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA.
Appendix is only available in electronic form at http://www.aanda.org
© ESO, 2010
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