Colloq Abstract -Kapinska

by Hubertus Intema last modified Apr 12, 2017 by Frank Schinzel

April 12

2pm Mountain

Anna Kapinska (UWA)

Science with the New-Generation Radio Surveys: AGN, star formation and the evolution of galaxies

Abstract:

The new continuum radio surveys already streaming from the new-generation radio telescopes are an outstanding resource for addressing long-standing questions in modern astrophysics. In this talk I will present recently delivered low frequency radio surveys from both the Low Frequency Array (LOFAR) and Murchison Widefield Array (MWA). I will highlight the importance of sensitive low frequency radio surveys and their complementarity to GHz radio observations. I will focus on two science cases: the impact of radio-loud AGN on the evolution of galaxies, and understanding star formation processes in normal galaxies. In the first part of the talk I will discuss radio galaxies in terms of their lifecycles. I will present and highlight the need for new deep, wide-field, versatile radio galaxy samples that are crucial in the studies of radio-loud AGN feedback. I will show how we can derive the unobservable physical parameters of radio galaxies (e.g. jet power) using radio observations and theoretical models of relativistic jets. The activity of radio galaxies is now understood as a key ingredient in the evolution of galaxies and galaxy clusters, yet little is known on many aspects of the kinetic AGN feedback. In the second part of the talk, I will present my recent work on understanding radio emission from, and physical processes in, star-burst and star-forming Sculptor Group galaxies at low radio frequencies. These early but detailed analyses on the nearby well-studied galaxies are designed to inform future population studies on the aspects of using radio continuum as a tracer of star formation.