The Intrinsic Far-infrared Continua of Type-1 Quasars
  The range of currently proposed active galactic nucleus (AGN) far-infrared
templates results in uncertainties in retrieving host galaxy information from
infrared observations and also undermines constraints on the outer part of the
AGN torus. We discuss how to test and reconcile these templates. Physically,
the fraction of the intrinsic AGN IR-processed luminosity compared with that
from the central engine should be consistent with the dust-covering factor. In
addition, besides reproducing the composite spectral energy distributions
(SEDs) of quasars, a correct AGN IR template combined with an accurate library
of star-forming galaxy templates should be able to reproduce the IR properties
of the host galaxies, such as the luminosity-dependent SED shapes and aromatic
feature strengths. We develop tests based on these expected behaviors and find
that the shape of the AGN intrinsic far-IR emission drops off rapidly starting
at $\sim20~\mu$m and can be matched by an Elvis et al. (1994)-like template
with minor modification. Despite the variations in the near- to mid-IR bands,
AGNs in quasars and Seyfert galaxies have remarkably similar intrinsic far-IR
SEDs at $\lambda \sim 20$-$100~\mu$ m, suggesting similar emission character of
the outermost region of the circumnuclear torus. The variations of the
intrinsic AGN IR SEDs among the type-1 quasar population can be explained by
the changing relative strengths of four major dust components with similar
characteristic temperatures, and there is evidence for compact AGN-heated dusty
structures at sub-kpc scales in the far-IR.
