Extragalactic abstracts - IRSA - California Institute of Technology
Extragalactic abstracts - IRSA - California Institute of Technology
Extragalactic abstracts - IRSA - California Institute of Technology
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Spitzer_Approved_<strong>Extragalactic</strong><br />
Mar 25, 10 16:24 Page 437/742<br />
Spitzer Space Telescope − General Observer Proposal #30299<br />
An intensive Spitzer survey <strong>of</strong> FeLoBAL QSOs<br />
Principal Investigator: Duncan Farrah<br />
Institution: Cornell University<br />
Technical Contact: Duncan Farrah, Cornell University<br />
Co−Investigators:<br />
Colin Borys, University <strong>of</strong> Toronto<br />
Robert Priddey, University <strong>of</strong> Hertfordshire<br />
Jose Afonso, University <strong>of</strong> Lisbon<br />
Mark Lacy, Spitzer Science Center<br />
Science Category: AGN/quasars/radio galaxies<br />
Observing Modes: MipsPhot<br />
Hours Approved: 9.9<br />
Abstract:<br />
We propose MIPS and IRS observations <strong>of</strong> eight ’FeLoBAL’ quasars. These quasars<br />
are characterised by absorption from metastable excited states <strong>of</strong> iron in their<br />
UV spectra, and are currently thought to be extremely rare, with only 40<br />
examples known over the whole sky. Very recent observations have however<br />
suggested that FeLoBALs are potentially quite common, and that they may<br />
represent a critical point in the lifetime <strong>of</strong> an IR−luminous galaxy when an<br />
obscured starburst is approaching its end, and a youthful quasar is starting to<br />
emerge from its dust cocoon. In this proposal, we aim to use Spitzer to test<br />
this hypothesis. We will use the MIPS data to see if FeLoBALs as a class are<br />
preferentially associated with heavily obscured starbursts, and use the IRS<br />
spectra to see if the mid−IR emission from FeLoBALs is consistent with an<br />
evolutionary sequence from ULIRG to FeLoBAL, through to optical QSO.<br />
Spitzer_Approved_<strong>Extragalactic</strong><br />
Printed_by_SSC<br />
Mar 25, 10 16:24 Page 438/742<br />
Spitzer Space Telescope − Guaranteed Time Observer Proposal #40374<br />
Do FeLoBALs mark the transition between a ULIRG and a QSO?<br />
Principal Investigator: Duncan Farrah<br />
Institution: Cornell University<br />
Technical Contact: Duncan Farrah, Cornell University<br />
Co−Investigators:<br />
Colin Borys, University <strong>of</strong> Toronto<br />
Robert Priddey, University <strong>of</strong> Hertfordshire<br />
Jose Afonso, University <strong>of</strong> Lisbon<br />
Mark Lacy, Spitzer Science Center<br />
James Houck, Cornell University<br />
Science Category: AGN/quasars/radio galaxies<br />
Observing Modes: IrsStare<br />
Hours Approved: 14.0<br />
Abstract:<br />
We propose deep IRS observations <strong>of</strong> six Spitzer/MIPS detected ’FeLoBAL’ quasars.<br />
These quasars are characterised by iron absorption in their UV spectra. Once<br />
thought to be extremely rare, recent observations have however suggested that<br />
FeLoBALs may be common, and might represent a critical point in the lifetime <strong>of</strong><br />
an IR−luminous galaxy when an obscured starburst is approaching its end, and a<br />
youthful quasar is starting to emerge from its dust cocoon. We have used Spitzer<br />
to observe seven FeLoBAL QSOs, and found that all seven are bright in the IR,<br />
and likely contain both luminous, dusty AGN and intense, obscured star<br />
formation. We here seek to use IRS to observe six <strong>of</strong> these QSOs, to determine<br />
whether or not FeLoBALs are a transition type object via direct comparison<br />
between their mid−IR spectra and those <strong>of</strong> ULIRGs and QSOs.<br />
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