A SCUBA-2 survey of FeLoBAL QSOs. Are FeLoBALs in a `transition phase' between ULIRGs and QSOs?

摘要: It is thought that a class of broad absorption line (BAL) QSOs, characterized by Fe features in their UV spectra (called `FeLoBALs'), could mark transition stage between the end an obscured starburst event and youthful QSO beginning to shed its dust cocoon, where has been injected into interstellar medium starburst. To test this hypothesis, we have undertaken deep Submillimetre Common-User Bolometer Array 2 (SCUBA-2) 850 μm observations sample 17 FeLoBAL QSOs with 0.89 ≤ z 2.78 -23.31 MB -28.50 directly detect excess thermal emission which would probe enhanced star formation activity. We find FeLoBALs are not luminous sources sub-mm, none them individually detected at μm, nor as population through stacking (Fs = 1.14 ± 0.58 mJy). Statistical survival analyses reveal sub-mm properties consistent BAL non-BAL matched redshifts magnitudes. An Spectral Energy Distribution fitting analysis shows far-infrared dominated active galactic nuclei activity, component required only 6/17 our sample; moreover integrated total luminosity 16/17 L ≥ 1012 L⊙, high enough classify infrared luminous. In conclusion, do any evidence support being ultraluminous galaxy (ULIRG) unobscured QSO; particular, cold hypothesis.