Synchrotron and inverse-Compton emission from blazar jets - II. An
  accelerating jet model with a geometry set by observations of M87
  In this paper we develop the jet model of Potter & Cotter (2012) to include a
magnetically dominated accelerating parabolic base transitioning to a slowly
decelerating conical jet with a geometry set by recent radio observations of
M87. We conserve relativistic energy-momentum and particle number along the jet
and calculate the observed synchrotron emission from the jet by calculating the
integrated line of sight synchrotron opacity through the jet in the rest frame
of each section of plasma. We calculate the inverse-Compton emission from
synchrotron, CMB, accretion disc, starlight, broad line region, dusty torus and
narrow line region photons by transforming into the rest frame of the plasma
along the jet.
  We fit our model to simultaneous multi-wavelength observations of the
Compton-dominant FSRQ type blazar PKS0227-369, with a jet geometry set by M87
and an accelerating bulk Lorentz factor consistent with simulations and theory.
We investigate models in which the jet comes into equipartition at different
distances along the jet and equipartition is maintained via the conversion of
jet bulk kinetic energy into particle acceleration. We find that the jet must
still be magnetically dominated within the BLR and cannot be in equipartition
due to the severe radiative energy losses. The model fits the observations,
including radio data, very well if the jet comes into equipartition outside the
BLR within the dusty torus (1.5pc) or at further distances (34pc). We find that
our fit in which the jet comes into equipartition furthest along the jet, which
has a jet with the geometry of M87 scaled linearly with black hole mass, has an
inferred black hole mass close to previous estimates. This implies that the jet
of PKS0227 might be well described by the same jet geometry as M87.
