Self-consistent 2-phase AGN torus models: SED library for observers
  We assume that dust near active galactic nuclei (AGN) is distributed in a
torus-like geometry, which may be described by a clumpy medium or a homogeneous
disk or as a combination of the two (i.e. a 2-phase medium). The dust particles
considered are fluffy and have higher submillimeter emissivities than grains in
the diffuse ISM. The dust-photon interaction is treated in a fully
self-consistent three dimensional radiative transfer code. We provide an AGN
library of spectral energy distributions (SEDs). Its purpose is to quickly
obtain estimates of the basic parameters of the AGN, such as the intrinsic
luminosity of the central source, the viewing angle, the inner radius, the
volume filling factor and optical depth of the clouds, and the optical depth of
the disk midplane, and to predict the flux at yet unobserved wavelengths. The
procedure is simple and consists of finding an element in the library that
matches the observations. We discuss the general properties of the models and
in particular the 10mic. silicate band. The AGN library accounts well for the
observed scatter of the feature strengths and wavelengths of the peak emission.
AGN extinction curves are discussed and we find that there is no direct
one-to-one link between the observed extinction and the wavelength dependence
of the dust cross sections. We show that objects of the library cover the
observed range of mid IR colors of known AGN. The validity of the approach is
demonstrated by matching the SEDs of a number of representative objects: Four
Seyferts and two quasars for which we present new Herschel photometry, two
radio galaxies, and one hyperluminous infrared galaxy. Strikingly, for the five
luminous objects we find pure AGN models fit the SED without a need to
postulate starburst activity.
