The new class of FR0 radio galaxies

I present my recent project aimed at studying the bulk of the radio-emitting AGN population. In previous works (Baldi & Capetti 2009, 2010) we provide evidences of an emerging population of compact radio galaxies which lack of extended radio emission. In a pilot JVLA project, we observe a small but representative sub-sample of this population. The radio maps reveal compact unresolved or slightly resolved radio structures on a scale of 1-3 kpc. We find that these radio-loud AGN live in red massive early-type galaxies, with large black hole masses (~10^{8} solar mass), and spectroscopically classified as Low Excitation Galaxies, all characteristics typical of FRI radio galaxies which they also share the same nuclear luminosity with. However, they are more core dominated (by a factor of ~30) than FRIs and show a clear deficit of extended radio emission. We call these sources 'FR0' to emphasize their lack of prominent extended radio emission (Baldi et al 2015). The emerging FR0 population appears to be the dominant radio class of the local Universe. Considering their properties I peculate their possible origins and the possible cosmological scenarios they imply