An X-Ray[endash]Selected Galaxy Cluster at [bold [ital z]] = 1. 26

  title={An X-Ray[endash]Selected Galaxy Cluster at [bold [ital z]] = 1. 26},
  author={Piero Rosati and Spencer Adam Stanford and Peter Eisenhardt and Richard Joseph Elston and Hyron Spinrad and Daniel Stern and Arjun Dey},
  journal={The Astronomical Journal},
We report the discovery of an X-ray[endash]luminous galaxy cluster at z=1.26. RX J0848.9+4452 was selected as an X-ray cluster candidate in the [ital ROSAT] Deep Cluster Survey on the basis of its spatial extent. Deep optical and near-IR imaging have revealed a galaxy overdensity around the peak of the X-ray emission, with a significant excess of red objects with [ital J][minus][ital K] colors typical of elliptical galaxies at z[gt]1. Spectroscopic observations at the Keck II Telescope have… 

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