Physics
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop..242z&link_type=abstract
Spitzer Proposal ID #242
Physics
Scientific paper
The success of unification models for Seyfert galaxies raises the question of whether these models can be extended to high luminosity AGNs. We recently published a sample of 150 type II (obscured) quasar candidates at redshifts z<0.8 selected by their emission line properties from the spectroscopic database of the Sloan Digital Sky Survey. We propose to conduct Spitzer mid-IR (7.4-21.3 micron) spectroscopy of the IR-brightest objects from the sample, as determined from our Cycle 1 imaging program with Spitzer. These data can be used to constrain the physical conditions of the obscuring material using radiative transfer models, as the shape of the spectral energy distributions at these wavelengths is sensitive to whether the dust is distributed homogeneously or is concentrated in clumps, to the exact viewing geometry and to the highest dust temperature present. For objects viewed edge-on, the 9.7 micron silicate feature in absorption can be u sed to calculate the line-of-sight optical depth of the dust. Additionally, if Polycyclic Aromatic Hydrocarbon emission features (6.2-16.4 micron) are detected, this would suggest the presence of strong starbursts possibly coupled to the AGN activity. Many of the objects in the sample have been observed with HST, Chandra, XMM and MMT.
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