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Using XMM we detect faint unresolved X-ray emission from the Compact SteepSpectrum radio galaxy 3C303.1. We detect a thermal component at kT = 0.8 keVwhich seems likely to be produced in the ISM of the host galaxy. There isevidence for a second component in the spectrum whose nature is currentlyambiguous. Plausible hypotheses for the second component include (1) hot gasshocked by the expansion of the radio source, and (2) Synchrotron self-Comptonemission from the southern radio lobe if the magnetic field is below theequipartition value by a factor of about 3.5

XMM‐NewtonDetection of X‐Ray Emission from the Compact Steep‐Spectrum Radio Galaxy 3C 303.1