Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20525a&link_type=abstract
Spitzer Proposal ID #20525
Other
Scientific paper
According to the simplest Unified Model, all radio galaxies contain hidden quasars surrounded by opaque dusty tori. In that case all radio galaxies should produce strong reprocessed IR emission from the obscuring tori. We've shown with Keck mid-IR imaging and the first of our Cycle 1 data on FR II radio galaxies that this is false: while all of the most luminous FR IIs have hidden broad line radio galaxies or quasars, only SOME of the FR IIs at lower luminosity have them! Here we propose to test the FR Is in a similar way. Contrary to popular belief, many of those DO have visible or hidden broad-line nuclei. By identifying which are which, we can infer the probably energy source for each. If a hidden broad line radio galaxy, most of the power is though to come from accretion and most of their luminosity is radiative; otherwise by default probably most of the power comes from black hole rotation and emerges in the form of the the kinetic luminosity of the radio jet. This difference is likely to be manifest in the detailed radio source properties. We will also look for AGN narrow emission lines, and compare our spectra with dusty torus models.
Antonucci Robert
Kishimoto Makoto
Ogle Pat
Whysong David
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