Title: Star formation and growth of early galaxies
Abstract: After successful deployment and commissioning, JWST has now been delivering data for nearly two years. I will give an overview of the first-year surprises and discoveries, zooming in on some of the earliest galaxies and presenting new results on the spatially resolved growth histories of high-redshift galaxies. Specifically, I will discuss the structural and stellar population properties of the galaxies at the redshift frontier, with redshifts z>10. I will then connect the mode of star formation with the early enrichment of galaxies: for galaxies where we have constraints on the gas-phase metallicity (at redshift of z=8), I will show how star-bursting galaxies can have different gas-phase metallicities due to internal and external mechanisms that drive the starburst. Finally, I will focus on the structural evolution of galaxies, presenting how dense stellar cores form within galaxies at z>7. I will wrap up by highlighting what JWST will be able to deliver regarding the black hole - galaxy co-evolution in the upcoming years.
Bio: Sandro Tacchella is an astrophysicist working at the Department of Physics (Cavendish Laboratory) and at the Kavli Institute for Cosmology of the University of Cambridge. Before joining the University of Cambridge in 2022, he was Assistant Professor at the Physics Department of UNIST in Ulsan, Korea. From 2017-2021, he was a CfA Fellow at the Harvard-Smithsonian Center for Astrophysics in Cambridge, USA. He has received his Ph.D. from ETH Zurich (Switzerland) in 2017.
Sandro's long-range scientific goal is to understand the physics of the formation and evolution of galaxies and black holes across cosmic time. Specifically, he investigates the physical mechanisms that govern the formation of the first galaxies in the early universe, the buildup of the bulge and disk components in galaxies, and the cessation of star formation in massive galaxies. He exploits cutting-edge multi-wavelength observational data obtained with some of the most advanced telescopes on ground and in space. He uses and develops analytical and cosmological numerical models to shed light on the physical properties of galaxies. Sandro is also heavily involved in the new James Webb Space Telescope, playing a key role both in the data processing of the NIRCam instrument and in projects aimed at detecting galaxies formed in the early Universe and at characterising their primeval properties.
Zoom link:https://huji.zoom.us/j/89094267602?pwd=cERsUS9sK1dIL0xzc2NyR3puTUwwZz09
Meeting ID: 890 9426 7602
Passcode: 915502
Contact: Zhaozhou