S E M I N A R IDepartament d'Astronomia i Astrofísica
Universitat de València
Star formation efficiencies of radio galaxies
Centro de Astrobiología (CSIC/INTA)
Seminari del departament d'Astronomia i Astrofísica
Dimarts 20 desembre 2016
Powerful radio galaxies show evidence of ongoing active galactic nuclei (AGN) feedback, mainly in the form of fast, massive outflows. Yet, it is not clear how these outflows affect the star formation of their hosts. It is thought that most radio galaxies will show quenched star formation, compared with the KS-law. We investigated the different manifestations of AGN feedback in two radio galaxies: the evolved 3C 293 radio source, and in the young, reactivated 3C 236. Both sources harbor young star-forming regions and fast outflows of H I and ionized gas. Due to the different evolution stages of these sources, they are expected to be at different phases of the AGN-ISM interaction process. We studied the distribution and kinematics of the molecular gas in these sources, and their star-formation properties using all available SFR tracers. Our results suggest that the apparently low efficiency of radio galaxies is not necessarily due to AGN feedback, but may be caused by an underestimation of the SFR and/or an overestimation of the molecular gas densities in the host.