|The Australia Telescope National Facility Colloquium|
|15:00-16:00 Wed 03 Jul 2019|
Marsfield lecture theatre
(University of Tasmania)
Stas Shabala Colloquium: Energetics and lifecycles of radio galaxies: what can models tell us?
Active Galactic Nuclei (AGN) play a key role in the formation and evolution of galaxies by imparting copious amounts of energy to their surroundings. Direct evidence indicates that so-called radio mode feedback, i.e. feedback done by radio jets, is responsible for regulating star formation in the most massive galaxies over the last half of Hubble time. Two parameters play a key role in determining feedback efficiency: (1) the kinetic power of AGN jets, which set how much energy is available for feedback; and (2) the timescales related to their injection, which determine the efficiency with which this energy is deposited in the surrounding gas. In principle, observations of radio galaxy populations encode this information on feedback energetics and duty cycles, yet interpreting these observations is challenging due to the highly non-linear nature of the mapping between the observable and physical properties of radio jets.
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