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The integrated HydroKinetic Model (iHKM) is applied to analyse the results ofdirect photon spectra as well as elliptic and triangular flow measurements in200A GeV Au+Au collisions at RHIC for different centrality bins. Experimentsdetect the strong centrality dependence of photon elliptic and triangular flowas increasing $v_n(p_T)$-coefficients towards peripheral collisions. The photonproduction in the model is accumulated from the different sources along withthe process of relativistic heavy ion collision developing. Those include theprimary hard photons from the parton collisions at the very early stage of theprocess, the photons generated at the pre-thermal phase of dense matterevolution, then thermal photons at partially equilibrated hydrodynamicquark-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: chemicallyequilibrium and chemically non-equilibrium, namely, chemically frozenexpansion. We find the description of direct photon spectra, elliptic andtriangular flow are significantly improved, similar to that found in iHKM forthe LHC energies, if an additional portion of photon radiation associated withthe confinement processes, the "hadronization photons", is included intoconsideration.

nuclear physics a

Photon spectra and anisotropic flow in heavy ion collisions at the top  RHIC energy within the integrated hydrokinetic model with photon  hadronization emission