Jun 30, 2021

Speaker: Prof. Manel Perucho (University of Valencia, Spain)

Title: FRI/FRII dichotomy of Radiogalaxies

Abstract: Radiogalaxies are misaligned active galaxies that show bipolar relativistic outflows that extend from the galactic nucleus to hundreds of kiloparsecs. Depending on their global morphology, they are divided into Fanaroff-Riley type I or type II (Fanaroff & Riley, 1974). The latter show collimated outflows and bright spots and lobes at the interaction region with the intergalactic medium. The former seem to lose collimation within their host galaxy and adopt plumed, diffuse morphologies at the largest scales, without hints of spots or lobes. In my talk, I will review the possible origin of this dichotomy and the physical processes that explain such different structures, using both numerical experiments theoretical models, and I will discuss why this classification is a very usefuel initial simplification that is being overcome by the evidence of a continuous transition between both populations.