Measurement of electro-magnetic radiation at RHIC-PHENIX

Recent results on direct photons and dileptons from the PHENIX experiment opened up a possibility of landscaping electro-magnetic radiation over various kinetic energies in heavy ion collisions. Results on direct photon measurement in Au+Au collisions at are discussed from the point of view of structure function and isospin effect. It is supported by the first measurement of direct photons at in the same collisional system.