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FR0s are compact radio sources that represent the bulk of the Radio-Loud (RL)AGN population, but they are still poorly understood. Pilot studies on thesesources have been already performed at radio and optical wavelengths: here wepresent the first X-ray study of a sample of 19 FR0 radio galaxies selectedfrom the SDSS/NVSS/FIRST sample of Best & Heckman (2012), with redshift $\leq$0.15, radio size $\leq$ 10 kpc and optically classified as low-excitationgalaxies (LEG). The X-ray spectra are modeled with a power-law componentabsorbed by Galactic column density with, in some cases, a contribution fromthermal extended gas. The X-ray photons are likely produced by the jet asattested by the observed correlation between X-ray (2-10 keV) and radio (5 GHz)luminosities, similar to FRIs. The estimated Eddington-scaled luminositiesindicate a low accretion rate. Overall, we find that the X-ray properties ofFR0s are indistinguishable from those of FRIs, thus adding another similaritybetween AGN associated with compact and extended radio sources. A comparisonbetween FR0s and low luminosity BL Lacs, rules out important beaming effects inthe X-ray emission of the compact radio galaxies. FR0s have different X-rayproperties with respect to young radio sources (e.g. GPS/CSS sources),generally characterized by higher X-ray luminosities and more complex spectra.In conclusion, the paucity of extended radio emission in FR0s is probablyrelated to the intrinsic properties of their jets that prevent the formation ofextended structures, and/or to intermittent activity of their engines.

X-ray study of a sample of FR0 radio galaxies: unveiling the nature of the central engine