Thursday 30/05/2019 @ 11:30, Sala IV piano Battiferro
Ranieri Baldi (University of Southampton, UK), "The multi-band properties of low-luminosity radio galaxies in the local Universe"
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.