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Observed in a significant fraction of clusters and groups of galaxies,diffuse radio synchrotron emission reveals the presence of relativisticelectrons and magnetic fields permeating large-scale systems of galaxies.Although these non-thermal electrons are expected to upscatter cosmic microwavebackground photons up to hard X-ray energies, such inverse-Compton (IC) X-rayemission has so far not been unambiguously detected on cluster/group scales.Using deep, new proprietary XMM-Newton observations ($\sim$200 ks of cleanexposure), we report a 4.6$\sigma$ detection of extended IC X-ray emission inMRC 0116+111, an extraordinary group of galaxies at $z = 0.131$. Assuming aspectral slope derived from low-frequency radio data, the detection remainsrobust to systematic uncertainties. Together with low-frequency radio data fromGMRT, this detection provides an estimate for the volume-averaged magneticfield of $(1.9 \pm 0.3)$ $\mu$G within the central part of the group. Thisvalue can serve as an anchor for studies of magnetic fields in the largestgravitationally bound systems in the Universe.

Discovery of inverse-Compton X-ray emission and estimate of the volume-averaged magnetic field in a galaxy group