Serendipitous Discovery of a Broad Absorption Line QSO at [CLC][ITAL]z[/ITAL][/CLC] = 2.169

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Abstract
We report the serendipitous discovery of a broad absorption line (BAL) QSO at z = 2.169, located 41'' southwest of 3C 48. We present Keck Low Resolution Imaging Spectrometer spectroscopy covering rest-frame wavelengths 1500–2300 Å. The C IV BAL has three components, and it extends to outflow velocities of at least 12,000 km s-1. The BAL QSO has an intervening low-ionization metal-line absorption system at z = 1.667, which is likely to be a damped Lyα absorber. Hubble Space Telescope images show extended luminous material around the QSO, which could be either the host galaxy or the intervening system.