Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20083l&link_type=abstract
Spitzer Proposal ID #20083
Other
Scientific paper
We have used the Spitzer First Look Survey, in conjunction with the Sloan Digital Sky Survey, to select the first sample of type-1 (unobscured) and type-2 (obscured) quasars matched in mid-infrared luminosity. We wish to study the infrared SEDs of these objects using low resolution IRS spectroscopy and MIPS photometry. The results of this study will help us understand the relationship between the well-studied type-1 and the much less well-studied type-2 quasar populations. We will search for evidence of higher star formation activity in the type-2 objects though enhanced PAH and far-IR emission which may indicate that type-2 quasars evolve into type-1s. If, on the other hand, the only difference between type-1 and type-2 quasars is orientation, we expect the PAH emission and far-infrared SEDs to be similar. We will also compare our mid-infrared SEDs to models of emission from the dusty torus around the quasars, and use our observations of the SED shape and depth of the silicate absorption feature to constrain the clumpiness and optical depth of the dust.
Armus Lee
Canalizo Gabriela
Lacy Mark
Ridgway Susan
Sajina Anna
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