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Several nearby clusters exhibit an excess of soft X-ray radiation whichcannot be attributed to the hot virialized intra-cluster medium. There is noconsensus to date on the origin of the excess emission: it could be either ofthermal origin, or due to an inverse Compton scattering of the cosmic microwavebackground. Using high resolution XMM-Newton data of Sersic 159-03 we firstshow that strong soft excess emission is detected out to a radial distance of0.9 Mpc. The data are interpreted using the two viable models available, i.e.,by invoking a warm reservoir of thermal gas, or relativistic electrons whichare part of a cosmic ray population. The thermal interpretation of the excessemission, slightly favored by the goodness-of-fit analysis, indicates that thewarm gas responsible for the emission is high in mass and low in metallicity.Comment: ApJ in pres

Thermal and Nonthermal Nature of the Soft Excess Emission from Sersic 159‐03 Observed withXMM‐Newton