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The integrated HydroKinetic Model (iHKM) is applied to analyse the results ofdirect photon spectra and elliptic flow measurements in 200A GeV Au+Aucollisions at RHIC for the three centrality bins. We detect the strongcentrality dependence of photon elliptic flow as $v_2(p_T)$-coefficientincreases towards peripheral collisions. The photon production in the model isaccumulated from the different sources along with the process of relativisticheavy ion collision developing. Those include the primary hard photons from theparton collisions at very early stage of the process, the photons generated atthe pre-thermal phase of matter evolution, then thermal photons at equilibratedquark-gluon stage together with radiation displaying a confinement and,finally, from the hadron gas phase. Along the way a hadronic medium evolutionis treated in two distinct, in a sense opposite, approaches: chemicallyequilibrated and chemically frozen system expansion. We find that similar as itwas found in iHKM for the LHC energies, a description of the direct photonspectra and elliptic flows is significantly improved if an additional portionof the photon radiation, that is associated with hadronization processes, isincluded into consideration.

Analysing direct photon spectra and elliptic flow from heavy ion  collision measurements at the top RHIC energy within the integrated  hydrokinetic model