Speaker: Dr. Nicolas Laporte (LAM), Host: Dr. Pham Tuan Anh (VNSC)

Abstract: One of the most exciting challenges in modern extragalactic astronomy is to understand how the first galaxies emerged from a dark Universe and how their physical properties evolved. Significant advances have been made in the last decade, thanks to the introduction of new telescopes and instruments such as ALMA, MOSFIRE, MUSE, and JWST, along with deep and wide surveys like Frontier Fields, UltraVISTA, and CANDELS. In 10 years, the observational frontiers of the Universe have expanded from z~9(2012) to z~17 (2023). The number of spectroscopically confirmed galaxies with z>6 has surged from a dozen (2012) to several hundred (2024), including around a dozen at z>9! By combining data obtained from multiple instruments across a broad range of wavelengths, it is now possible to determine key physical properties of individual high-z galaxies, such as their age, escape fraction, size, radiation field, and metallicity. Through the study of the entire population of very high-redshift galaxies, we can also infer when the first generation of galaxies formed during the early Universe (known as the Cosmic Dawn) and their contribution to the Epoch of Reionisation. In this presentation, I will describe some of the latest findings regarding the physical properties of the first generation of galaxies.

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