  The integrated HydroKinetic Model (iHKM) is applied to analyse the results of
direct photon spectra as well as elliptic and triangular flow measurements in
200A GeV Au+Au collisions at RHIC for different centrality bins. Experiments
detect the strong centrality dependence of photon elliptic and triangular flow
as increasing $v_n(p_T)$-coefficients towards peripheral collisions. The photon
production in the model is accumulated from the different sources along with
the process of relativistic heavy ion collision developing. Those include the
primary hard photons from the parton collisions at the very early stage of the
process, the photons generated at the pre-thermal phase of dense matter
evolution, then thermal photons at partially equilibrated hydrodynamic
quark-gluon stage, together with radiation displaying a confinement and,
finally, from the hadron gas phase. Along the way a hadronic medium evolution
is treated in two distinct, in a sense opposite, approaches: chemically
equilibrium and chemically non-equilibrium, namely, chemically frozen
expansion. We find the description of direct photon spectra, elliptic and
triangular flow are significantly improved, similar to that found in iHKM for
the LHC energies, if an additional portion of photon radiation associated with
the confinement processes, the "hadronization photons", is included into
consideration.
