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arXiv · astro-ph/9712253

An X-ray Cluster at Redshift 2.156?

C. L. Carilli·D. E. Harris·L. Pentericci·H. J. A. Rottgering·G. K. Miley·M. N. Bremer
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Abstract

We present X-ray observations of the narrow line radio galaxy 1138-262 at z = 2.156 with the High Resolution Imager (HRI) on ROSAT. Observations at other wave-bands, and in particular extremely high values of Faraday rotation of the polarized radio emission, suggest that the 1138-262 radio source is in a dense environment, perhaps a hot, cluster-type atmosphere. We detect X-ray emission from the vicinity of 1138-262, and we discuss possible origins for this emission. The X-ray, optical, and radio data all favor thermal emission from a hot cluster atmosphere as the mechanism responsible for the X-rays, although we cannot rule out a contribution from the active nucleus. If this interpretation is correct, then 1138-262 becomes the most distant, by far, of known X-ray emitting clusters. The X-ray luminosity for 1138-262 is 6.7+/-1.3 x 10**44 ergs/sec for emitted energies between 2 keV and 10 keV.

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C. L. Carilli, D. E. Harris, L. Pentericci, H. J. A. Rottgering, G. K. Miley, M. N. Bremer. 1997-12-18. An X-ray Cluster at Redshift 2.156?. https://doi.org/10.1086/311246

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