An X-Ray Cluster at Z = 2.156

Details An X-Ray Cluster at Z = 2.156 An X-Ray Cluster at Z = 2.156

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop...23c&link_type=abstract

Chandra Proposal ID #01800254

Physics

Chandra Proposal Id #01800254

Scientific paper

We propose AXAF observations of the radio galaxy 1138-262 at z = 2.156. We have detected X-ray emission from 1138-262 using the ROSAT HRI. The X-ray, optical, and radio data all favor thermal X-ray emission from a hot cluster atmosphere, although we cannot rule out a contribution from the active nucleus. The X-ray luminosity for 1138-262 is 6.7x10^{44} ergs/sec between 2 and 10 keV. Sensitive, high resolution spectroscopic imaging with AXAF could verify that the X-ray emission from 1138-262 is from a hot cluster atmosphere. If so, then 1138-262 becomes the most distant, by far, of known X-ray emitting clusters. Detecting such a massive collapsed structure at high redshift presents a severe challenge to models of cosmic structure formation using standard cosmologies.

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