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 Feii. 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.
@article{arxiv.astro-ph/0205022,
title = {An unusual iron Lo-BAL quasar detected by ISOCAM},
author = {P. -A. Duc and P. B. Hall and D. Fadda and P. Chanial and D. Elbaz and P. Monaco and E. Pompei and B. M. Poggianti and H. Flores and A. Franceschini and A. Biviano and A. Moorwood and C. Cesarsky},
journal= {arXiv preprint arXiv:astro-ph/0205022},
year = {2009}
}