Bayesian Evidence for both Slow and Rapid Quenching of Star Formation in Disc Galaxy Populations
Witnessing Disc Galaxy Evolution Through The Eyes of their Stellar Structures
Rebecca Smethurst
University of Oxford
Chris Lintott (University of Oxford), Brooke Simmons (University of Oxford), Kevin Schawinski (ETH Zurich), Phil Marshall (Stanford University), Steven Bamford (University of Nottingham), Karen Masters (University of Portsmouth) and the Galaxy Zoo Team
Disc galaxies are not confined to slow, isolated evolution; instead we show that their star formation histories are diverse and they may evolve through rapid, intermediate or slow quenching mechanisms from the blue cloud to the red sequence. We present the results of a new analysis of the disc galaxy population (0.01 rom Galaxy Zoo we are able to constrain which mechanisms form the observed structures of disc galaxies allowing us to conclude that slow, intermediate and rapid quenching mechanisms are all instrumental in the formation of the present day diverse disc population. We discuss the nature of these quenching mechanisms, considering the influence of secular evolution, galaxy interactions and mergers both with and without black hole activity. With further investigation, we have found the presence of an AGN is crucial to the quenching track taken across the colour magnitude diagram.


09:00 - 10:30