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Australian Human Resources Institute Diversity Awards 2013 Finalist

Marios Karouzos (CEOU - Seoul National University)

"Radio-AGN under the microscope: environment and host galaxies"

Abstract. There are several lines of arguments that connect activity at the centres of galaxies with the evolution of these galaxies as a whole. The interplay between AGN and their host galaxies has been investigated both in terms of AGN triggering as well as star-formation feedback processes, the former as the main way for galactic nuclei to grow, whereas the latter providing a means to regulate the growth of the entire galaxy. In this talk I will address the role of a specific flavour of AGN, radio-AGN, in these processes. I will start by investigating the merger-induced AGN triggering scenario. I will approach this question by studying the close environment of different radio-AGN samples. In the second half of my talk I will investigate the link between radio-AGN and star-formation in their host galaxies. In short, I will show evidence supporting the idea of merger-induced AGN triggering, although possibly for only a subset of the radio-AGN population. In addition, an absence of an appreciable trend between the AGN environment and the AGN luminosity casts doubt on the common assumption that the most luminous AGN are merger-driven. I will also show that star-formation appears suppressed in the host galaxies of the most radio-loud AGN, although radio-jets seem to play a regulatory rather than outright quenching role.

Held in the AAO Meeting Room (Room 7, 1st Floor, Building 2) at 11:00 AM on Thursday, 27 March 2014