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Over the last decade, ALMA has opened up our view of the fuel for star formation in distant galaxies, by probing the emission from cold, molecular gas and dust. Multiple surveys of dust and CO emission have provided a view of how the total gas content evolves from z~4 to today, and how this relates to the build up of stellar mass in galaxies. However, zooming in to individual galaxies remains a challenge. How is star-forming gas distributed relative to the existing stars? And, what are the physical conditions within the gas? In this seminar, I will provide a short overview of the current highest-resolution view of cold gas in galaxies at Cosmic Noon and what indicates about the structures of these early galaxies compared to local galaxies. I will also highlight how we are probing the turbulence, temperature and density of this cold gas, from galaxies at Cosmic Noon to the EoR, and how some of these conditions may be changing. Throughout the talk, I will highlight the current challenges and give some perspective for the next decade of studies of star-forming gas in distant galaxies. |
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