Do FeLoBALs mark the transition between a ULIRG and a QSO?

Details Do FeLoBALs mark the transition between a ULIRG and a QSO? Do FeLoBALs mark the transition between a ULIRG and a QSO?

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40374f&link_type=abstract

Spitzer Proposal ID #40374

Computer Science

Scientific paper

We propose deep IRS observations of six Spitzer/MIPS detected 'FeLoBAL' quasars. These quasars are characterised by iron absorption in their UV spectra. Once thought to be extremely rare, recent observations have however suggested that FeLoBALs may be common, and might represent a critical point in the lifetime of an IR-luminous galaxy when an obscured starburst is approaching its end, and a youthful quasar is starting to emerge from its dust cocoon. We have used Spitzer to observe seven FeLoBAL QSOs, and found that all seven are bright in the IR, and likely contain both luminous, dusty AGN and intense, obscured star formation. We here seek to use IRS to observe six of these QSOs, to determine whether or not FeLoBALs are a transition type object via direct comparison between their mid-IR spectra and those of ULIRGs and QSOs.

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