The extreme ultraviolet excess emission in five clusters of galaxies revisited

Evidence for excess extreme ultraviolet (EUV) emission over a tail of thermal X-ray bremsstrahlung emission has been building up recently. In order to improve the signal to noise ratio in the EUV we have performed a wavelet based image analysis for five clusters of galaxies observed both at EUV and X-ray energies with the EUVE and ROSAT satellites respectively. The profiles of the EUV and X-ray reconstructed images all differ at a very large confidence level and an EUV excess over a thermal bremsstrahlung tail is detected in all five clusters (Abell 1795, Abell 2199, Abell 4059. Coma and Virgo) up to large radii. Our results tend to suggest that the EUV excess is probably non thermal in origin.