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MRC 0116+111 is a nearby ($z=0.132$) poor galaxy group, which was previouslyknown for exhibiting a bright diffuse radio emission with no central point-likesource, presumably related to a past activity of the active galactic nucleus(AGN) in its central cD galaxy. Here, we present an X-ray observation ($\sim$30ks of cleaned XMM-Newton/EPIC exposure) of this system, allowing us for thefirst time a detailed comparison between the thermal and non-thermal componentsof its intragroup medium (IGrM). Remarkably, we find that the radio-to-X-rayluminosity ratio is among the highest ever observed for a diffuse extragalacticsource so far, while the extent of the observed radio emission is about threetimes larger than its observed soft X-ray emission. Although powerful AGNactivity may have disturbed the dynamics of the thermal IGrM in the form ofturbulence, possibly re-energising part of the relativistic electronpopulation, the gas properties lie within the $L_X$-$T$ scaling relationestablished previously for other groups. The upper limit we find for thenon-thermal inverse-Compton X-ray emission translates into a surprisingly highlower limit for the volume-averaged magnetic field of the group ($\ge$4.3$\mu$G). Finally, we discuss some interesting properties of a distant ($z\simeq 0.525$) galaxy cluster serendipitously discovered in our EPIC field ofview.

Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116+111