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We present mid-infrared spectra of six FeLoBAL QSOs at 1<z<1.8, taken withthe Spitzer space telescope. The spectra span a range of shapes, from hot dustdominated AGN with silicate emission at 9.7 microns, to moderately obscuredstarbursts with strong Polycyclic Aromatic Hydrocarbon (PAH) emission. Thespectrum of one object, SDSS 1214-0001, shows the most prominent PAHs yet seenin any QSO at any redshift, implying that the starburst dominates the mid-IRemission with an associated star formation rate of order 2700 solar masses peryear. With the caveats that our sample is small and not robustly selected, wecombine our mid-IR spectral diagnostics with previous observations to proposethat FeLoBAL QSOs are at least largely comprised of systems in which (a) amerger driven starburst is ending, (b) a luminous AGN is in the last stages ofburning through its surrounding dust, and (c) which we may be viewing over arestricted line of sight range.

The extraordinary mid-infrared spectral properties of FeLoBAL Quasars