An intensive Spitzer survey of FeLoBAL QSOs

Details An intensive Spitzer survey of FeLoBAL QSOs An intensive Spitzer survey of FeLoBAL QSOs

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30299f&link_type=abstract

Spitzer Proposal ID #30299

Physics

Scientific paper

We propose MIPS and IRS observations of eight 'FeLoBAL' quasars. These quasars are characterised by absorption from metastable excited states of iron in their UV spectra, and are currently thought to be extremely rare, with only 40 examples known over the whole sky. Very recent observations have however suggested that FeLoBALs are potentially quite common, and that they may 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. In this proposal, we aim to use Spitzer to test this hypothesis. We will use the MIPS data to see if FeLoBALs as a class are preferentially associated with heavily obscured starbursts, and use the IRS spectra to see if the mid-IR emission from FeLoBALs is consistent with an evolutionary sequence from ULIRG to FeLoBAL, through to optical QSO.

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