Giovedì 20 giugno 2019, ore 11:00
Osservatorio Astrofisico di Torino, Sala Seminari di Villa Magliola
Exploring the radio morphology-accretion mode link through cross-population radio galaxies
Dr. Eleonora Torresi
INAF – Osservatorio di Astrofisica e Scienza dello Spazio
Radio galaxies are among the most energetic manifestation of the AGN phenomenon, and therefore they are extraordinarily relevant to address important unknowns relating accretion onto supermassive black holes, the role of the accretion in powering relativistic jets and the role of the surrounding environment in shaping the radio morphology: cross-population radio galaxies, i.e. sources with radio morphologies typical of powerful objects (FRII) but characterized by inefficient accretion (low excitation radio galaxies) are the best candidates to address these issues, since their existence puts the accretion-ejection connection in doubt.
In this talk, I will present a multi-wavelength study from radio to X-rays of FRII-LERG sources belonging to radio catalogs selected at different radio fluxes from Jy to mJy levels. The final aim is to shed light on the nature of these sources: do they represent an intermediate evolutionary phase between FRII and FRI or are they a class of sources different from classical FRI and FRII?
In order to answer to these questions several scenarios will be investigated.