Are FeLoBAL QSOs a `transition' population between ULIRGs and classical QSOs?

Details Are FeLoBAL QSOs a `transition' population between ULIRGs and classical QSOs? Are FeLoBAL QSOs a `transition' population between ULIRGs and classical QSOs?

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50656f&link_type=abstract

Spitzer Proposal ID #50656

Physics

Scientific paper

We propose to obtain MIPS photometry of 47 FeLoBAL QSOs. This class of QSO was, until recently, thought to be extremely rare, but recent work has shown that their strong reddening and heavy UV absorption systematically eliminates them from traditional QSO surveys, and that they may in fact be common objects. Furthermore, we recently observed a small sample of seven FeLoBAL QSOs with MIPS, and found evidence that a far higher fraction of the FeLoBAL QSO population may have FIR excesses, signifying active star formation, than the general QSO population, meaning that FeLoBAL QSOs may be the long sought population of `youthful' QSOs that harbor both a rapidly accreting black hole and very high rates of star formation. Our sample size was however too small to demonstrate this reliably. Therefore, we here propose to observe a much larger sample of confirmed FeLoBAL QSOs in all three MIPS channels. Our goal is to determine the fraction of the FeLoBAL QSO population that contain heavily obscured star formation, and so provide a direct and robust test of the hypothesis that FeLoBAL QSOs are a `transition' population between ULIRGs and classical QSOs.

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