Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3551e&link_type=abstract
Spitzer Proposal ID #3551
Physics
Scientific paper
The lack of broad emission lines in some narrow-line active galactic nuclei (AGN) has been explained by orientation effects: an optically thick, dusty torus obscures the broad emission line region in AGN oriented at large angles with respect to our line of sight. However, details of the physical state of the obscuring torus remain little known to this day. In fact, recent models indicate that the obscurer is possibly made up of a few clouds instead of having a continuous density distribution. An effective way to test present models is based on their distinct predictions for the inclination angle dependence of the emitted infrared spectral energy distribution (SED) and the 10 micron silicate feature. Here we propose a total of 8.2 hrs with the Spitzer Space Telescope in order to map the infrared SED with IRAC and MIPS and the depth of the 10 micron silicate feature with IRS for 12 radio-loud AGN with known inclination angles (range 20 - 60 deg). Having elliptical galaxy hosts these AGN will not have a starburst as a major contaminant of their far-infrared emission. Our observations will allow us to constrain the filling factor, scale and geometry of the obscurer in AGN. The result will be a deeper understanding of AGN.
Elitzur Moshe
Elvis Martin
Landt Hermine
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