IA/U.Lisboa Seminar-Star-forming galaxies morphology in the COSMOS field: evolution and environmental effects - 17 novembro 2016

IA

 

 

The morphology of galaxies strongly evolves over the cosmic time. In the last 13 Gyrs we witness the transformation from young complex morphologies to well defined spirals and ellipticals of the Hubble sequence. However, it is still unclear how and when this transformation happened. In this seminar I will present our results on the evolution of galaxy morphology across cosmic time and in diverse environments. I will focus on the star-forming population, selected through their Ha emission in the last 11 Gyrs and will extend that to earlier epochs (z~6) by using samples of Ly-a emitting galaxies. This analysis of morphology evolution includes the assessment of bias and systematics on the perceived structural parameters by using an improved artificial redshifting technique. In what concerns the environmental impact on morphology, I will present the sample for which we have VIMOS high resolution spectroscopy and for which we can measure [OII] and Hd. This allows us to pinpoint the state of star formation activity of galaxies and link that to shed more light on the question: do quenching and morphological transformation happen simultaneously?