1WGA J1226.9+3332: A High‐Redshift Cluster Discovered byChandra

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Abstract
We report the detection of 1WGA J1226.9+3332 as an arcminute-scale extended X-ray source with the Chandra X-Ray Observatory. The Chandra observation and R- and K-band imaging strongly support the identification of 1WGA 1226.9+3332 as a high-redshift cluster of galaxies, most probably at z = 0.85 ± 0.15, with an inferred temperature kT = 10 keV, and an unabsorbed luminosity (in a r = 120'' aperture) of 1.3 × 1045 ergs s-1 (0.5-10 keV). This indication of redshift is also supported by the K- and R-band imaging and is in agreement with the spectroscopic redshift of 0.89 found by Ebeling and coworkers. The surface brightness profile is consistent with a β model with β = 0.770 ± 0.025, rc = 181 ± 09 (corresponding to 101 ± 5 kpc at z = 0.89), and S(0) = 1.02 ± 0.08 counts arcsec-2. 1WGA J1226.9+3332 was selected as an extreme X-ray-loud source with FX/FV > 60; this selection method, thanks to the large area sampled, seems to be a highly efficient method for finding luminous, high-z clusters of galaxies.
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