Speaker
Description
To understand the galaxies of today, we must understand the galaxies of the past. The cosmic star formation activity peaked around z~2, a time known as the cosmic noon. At this time galaxies look quite different than today. More than 50% of the star formation activities were obscured by dust and reemitted in far-infrared/submillimetre. Galaxies dominated by submillimetre emission (> 1 mJy at 870 um) are called submillimetre galaxies (SMGs) and have been observed in both isolated and over-dense envisionments. (e.g. protoclusters). Understanding the nature of these galaxies could reveal how the environment impacts the evolution of galaxies.
In this talk, I will present our analysis of ALMA Band 5 and 6 follow-up observations from the Radio Galaxy Environment Reference Survey (RAGERS, PI: T. Greve), a large James Clark Maxwell Telescope survey. We will discuss the physical properties of the line ratio of the CO (7-6) and [CI] (2-1) lines compared to isolated galaxies and the implication of ALMA non-detections.