Oral Presentation
The stars, gas, and star-formation during galaxy transformation in the early Universe
Presenter: Po-Feng Wu (Academia Sinica Institute of Astronomy and Astrophysics)
Why and how galaxies stop forming stars is one of the most important unsolved questions in galaxy evolution. I present the most comprehensive multi-wavelength, imaging, and spectroscopic observations of galaxies which are transforming from active star formation to quiescent at 7 billion years ago, the epoch that the cosmic star-formation rate density is dropping rapidly.
The data collected by various observing facilities, including HST, Spitzer, VLT 8m, VLA, and ALMA, allow us to investigate the spatial distributions of stars, gas, and star-formation as well as the kinematics of such kinds of galaxies.
I will demonstrate that the truncation of star formation is likely part of the process of a centrally-concentrated starburst induced by galaxy-galaxy interaction. Multiple physical properties can change rapidly, causing some inconsistencies of galaxy properties found among different studies. The detailed description of this transformation process is the crucial step toward understanding how star-formation truncation in the early Universe.
asiaa.sinica.edu.tw