Active Galaxies


Nuclear activity is a fundamental ingredient in the formation history of a galaxy. This is documented by the presence of inactive supermassive black holes (SBH) in the center of virtually all massive spheroids. Moreover many similarities between the global properties of active and non active galaxies indicate a common origin for both types of galaxies. The characterization of the regions in the sphere of influence of the SBH is then used to study the interplay and evolution between BH mass and the properties of their host galaxies. Studies carried out at OAPd are aimed at deriving properties of galaxies that host powerful nuclear activity at high redshift, using high quality VLT and HST images. This allows to trace the evolution of active galaxies, as compare it with inactive massive spheroids and link it with the co-evolution of BH mass through virial mass determinations.

We also investigate the phenomenology of active galactic nuclei in a multi dimensional parameter space (similar to the H-R diagram for stellar population) that includes the properties of broad lines and the continuum emission. This analysis yields fundamental insights into the structure, physical condition and dynamics of the broad line emitting region (BLR) of AGN. At low redshift, we study radio galaxy in detail, with imaging and spectroscopy, to investigate how the (global and core) fundamental plane of RG compare with that of normal early type galaxies.


 p0521 colorCombined optical-nearIR image of the active galaxy PKS 0521-365 observed by HST+WFPC2 and VLT + MAD. A prominent jet is clearly visible with various substructures.


Active Galaxies - PAST STUDIES

Edu INAF - Risorse e iniziative per la scuola e la società dell'INAF

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