Speaker: Dr. Eleni Vardoulaki
Title: Radio AGN and their role in galaxy evolution
Abstract: Our current understanding of galaxy evolution, through observations and simulations, requires galaxy growth to be regulated by feedback from active galactic nuclei (AGN), in order to avoid having overly massive galaxies in the local Universe. AGN are known to affect their hosts by providing feedback in two modes: radiative (or quasar mode), which is observed at X-rays, and kinetic (or jet/radio mode), which is observed in the radio. AGN regulate massive galaxy growth by heating (negative feedback) the gas responsible for star formation and by displacing the gas in the circum-galactic medium, thus quenching star formation in their host galaxies. From observations, the radio-mode feedback, which is caused by the kinetic energy released from jets, has been shown to be more efficient in quenching star-formation. In this seminar I will present state-of-the-art observations of the COSMOS field (2.3 uJy/beam, 0”.75 resolution at 3-GHz VLA-COSMOS; Smolcic et al. 2017) and will discuss the link between radio AGN, their massive hosts and the large-scale environment (Vardoulaki et al. 2020). Given the upcoming radio facilities such as SKA, and precursors already in place (ASKAP, MeerKAT), I will discuss how by investing in the radio part of the electromagnetic spectrum we can obtain a better understanding of galaxy evolution.
Topic: Tuesday Lunch Talk
Date: Dec 8, 2020 11:56 AM London