  Electromagnetic radiation has been of interest in heavy ion collisions
because they shed light on early stages of the collisions where hadronic probes
do not provide direct information since hadronization and hadronic interactions
occur later. The latest results on photon measurement from the PHENIX
experiment at RHIC reflect thermodynamic properties of the matter produced in
the heavy ion collisions. An unexpectedly large positive elliptic flow measured
for direct photons can not be explained by any of the current models.
