An X-ray bright ERO hosting a type 2 QSO

P. Severgnini et al.

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We present the XMM-Newton and the optical-VLT spectra of one of the brightest X-ray (F(2-10 keV)~1e-13 cgs) EROs (R-K>5) discovered so far. The source, XBSJ0216-0435, belongs to the XMM-Newton Bright Serendipitous Survey and it has extreme X-ray-to-optical (~220) flux ratio. XBS J0216-0435 is one of the few examples of X-ray obscured QSO2 at high redshift (z~2) for which a detailed X-ray and optical spectral analysis has been possible. The SED from radio to X-rays is also presented.