Two Types of Type-2?

Details Two Types of Type-2? Two Types of Type-2?

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30634m&link_type=abstract

Spitzer Proposal ID #30634

Computer Science

Scientific paper

We propose to use the Spitzer IRS instrument to test the hypothesis that there are two distinct types of Type-2 (obscured) QSO: the first in which the nucleus is obscured at optical wavelengths by an organized torus; and the second, in which the nucleus is obscured by more distributed dust in an associated starburst. We will target a complete sample of Type-2 QSOs at z = 1.4-2 from the Spitzer First-Look Survey which, from optical spectroscopy, split into objects with high excitation, narrow-emission lines (torus-obscured QSOs?) and objects with totally blank optical spectra (starburst-obscured QSOs?). The IRS spectra will be sensitive to the the `Silicate Break' (and PAH features) and therefore identify and provide redshifts for any starburst-obscured QSOs, whereas QSOs in which there is a clear view of hot dust in the torus, will have relatively featureless mid-IR spectra, except for the silicate absorption feature.

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