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The multi-band properties of low-luminosity radio galaxies in the local Universe
Ranieri Baldi (University of Southampton, UK)
Thursday 30/05/2019 @ 11:30, Sala IV piano Battiferro
Radio galaxies produce the most energetic phenomena in the Universe. They are typically associated with giant elliptical galaxies hosting the most massive black holes (> 10^8 solar masses). In the local Universe (z0-0.3) the optical classification of radio galaxies reflects a clearer separation in nuclear and host properties than that based on the radio morphology. However, the results from my mutli-band studies demonstrates that the picture of the radio-loud AGN population provided by the classical samples of radio galaxies, i.e. 3C sample, is incomplete. Indeed, moving to low-luminosity active nuclei, the bulk of this population is dominated by objects which differ from powerful radio galaxies, by showing small radio structures and more heterogeneous host properties. Furthermore, a new class of radio galaxies emerges from radio surveys: the FR0s, which lack of large scale ( > 10 kpc) radio structures and dominate the local Universe in space density. Considering their properties, I will speculate about their possible origins and the possible cosmological scenarios they imply.