Nuclear X-ray properties of the peculiar radio-loud hidden AGN 4C+29.30
  We present results from a study of a nuclear emission of a nearby radio
galaxy, 4C+29.30, over a broad 0.5-200 keV X-ray band. This study used new
XMM-Newton (~17 ksec) and Chandra (~300 ksec) data, and archival Swift/BAT data
from the 58-month catalog. The hard (>2 keV) X-ray spectrum of 4C+29.30 can be
decomposed into an intrinsic hard power-law (Gamma ~ 1.56) modified by a cold
absorber with an intrinsic column density N_{H,z} ~ 5x10^{23} cm^{-2}, and its
reflection (|Omega/2pi| ~ 0.3) from a neutral matter including a narrow iron
Kalpha emission line at the rest frame energy ~6.4 keV. The reflected component
is less absorbed than the intrinsic one with an upper limit on the absorbing
column of N^{refl}_{H,z} < 2.5x10^{22} cm^{-2}. The X-ray spectrum varied
between the XMM-Newton and Chandra observations. We show that a scenario
invoking variations of the normalization of the power-law is favored over a
model with variable intrinsic column density. X-rays in the 0.5-2 keV band are
dominated by diffuse emission modeled with a thermal bremsstrahlung component
with temperature ~0.7 keV, and contain only a marginal contribution from the
scattered power-law component. We hypothesize that 4C+29.30 belongs to a class
of `hidden' AGN containing a geometrically thick torus. However, unlike the
majority of them, 4C+29.30 is radio-loud. Correlations between the scattering
fraction and Eddington luminosity ratio, and the one between black hole mass
and stellar velocity dispersion, imply that 4C+29.30 hosts a black hole with
~10^8 M_{Sun} mass.
