Other
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3624a&link_type=abstract
Spitzer Proposal ID #3624
Other
Scientific paper
We propose a simple observational program that will test the unification hypothesis for quasars and FR-II radio galaxies, constrain models of the dusty torus, and determine if the AGN are powered by thermal accretion or a non-thermal (probably rotational) mechanism. Spitzer is uniquely capable of carrying out this investigation with its unprecedented sensitivity. It has been shown directly by optical spectropolarimetry that many of the most powerful FR-II radio galaxies contain quasars hidden by opaque dusty tori; there is substantial statistical evidence that this is true for most or all of them. At somewhat lower powers the situation is not yet clear. Our work and that of others suggests that only a subset of radio galaxies have hidden quasars. We seek to establish this one way or the other and to determine which radio galaxies do or do not have hidden quasars. Spitzer data will also clarify whether statistical anomolies associated with the identification of radio galaxies with quasars can be understood as effects of a large population of physically smaller radio galaxies that lack hidden quasars. This would limit and define the applicability of the Unified Model. For theory, it would determine whether there are black-hole powered sources with just kinetic luminosity and without significant radiative accretion luminosity . Such non-thermal AGN would then have to be attributed to tapping rotational energy. We will also examine and compare the other observational properties of the two types of radio galaxies (hidden quasar or not), providing insight into the physics of the two types of power (accretion and rotation).
Antonucci Robert
Ogle Patrick
Whysong David
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