An unusual iron Lo-BAL quasar detected by ISOCAM ?

We report the discovery of an unusual low–ionization broad absorption line quasar at $z=1.776$ which exhibits absorption lines from many excited states of Fe ii. This member of the rare class of “FeLoBAL” quasars was serendipitously found in a mid–infrared (MIR) survey of distant clusters carried out with the ISOCAM camera. ISO J005645.1-273816 has a high MIR to UV luminosity ratio, suggesting a strong dust obscuration plus emission from very hot dust. This characteristic makes MIR surveys particularly efficient at detecting LoBAL quasars.