Allison Man - Mini Workshop 3 October 2018

Abstract: A major challenge in galaxy evolution research is how active galactic nuclei affect their host galaxies. Radio galaxies are ideal sites to study active galactic nuclei feedback, as they are massive galaxies with jets that interact with the surrounding medium. I will present results from a multi-wavelength analysis of PKS 0529-549, a massive radio galaxy at z=2.57.  We detect unambiguous signatures of stellar photospheric absorption lines originating from OB-type stars of age ~ 5 Myr in the 8.5-hour VLT/X-Shooter spectrum. More than one starburst episode spaced by ~40 Myr is necessary to explain the simultaneous occurrence of the stellar wind and photospheric features. Furthermore, its low stellar dispersion, low molecular gas content and high surface gas densities all support that its vigorous star formation is confined to small regions by compressive gas motions. These findings suggest that star formation works in concert with powerful radio jets to remove any residual gas, thereby quenching star formation in massive galaxies.