Discovery of a Type 2 Quasar at [ITAL]z[/ITAL] = 0.9

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Abstract
We report the discovery of a narrow-line, X-ray-luminous galaxy at z = 0.9, which is the counterpart of an X-ray source detected in a deep pointing observation with the Advanced Satellite for Cosmology and Astrophysics. The object has a hard X-ray spectrum; it is significantly detected only in the 2-10 keV band, with a flux of ~1 × 10-13 ergs s-1 cm-2. Its rest X-ray luminosity in the 2-10 keV band is estimated to be ~1 × 1044 ergs s-1 (q0 = 0.5, H0 = 50 km s-1 Mpc-1). The optical spectrum shows high-excitation and high-ionization lines but no significant broad emission line component. All these properties imply that this object is a "type 2 QSO."