Title：Two Recent Discoveries Made at the JWST - extremely young galaxies at z=8.31-8.49 and a disk galaxy at z=5.289

Speaker：Haojing Yan ( University of Missouri-Columbia)

Time: Jan. 16th, Thursday, 9:30am

Location: The large conference room at the 3rd floor

Abstract：

  JWST has been making breakthroughs in almost every forefront since its launch. This talk will share two recent discoveries: (1) Four infant galaxies at z=8.31-8.49 that likely form a filament structure; while they are all extremely young (< 20 Myrs), they have vastly different dust extinction. (2) A disk-like galaxy confirmed at z=5.289, which sets the redshift record for galaxies of regular disk morhpology. Both discoveries have far-reaching implications, which will be discussed in details.

CV：Prof. Haojing Yan is an observational astronomer at the University of Missouri-Columbia, where he joined the faculty of Department of Physics and Astronomy in 2011. He received his PhD at the Arizona State University in 2003, followed by postdoctoral researches at the Spitzer Science Center (JPL/Caltech; 2003-2006), the Carnegie Observatories (2006-2008), and the Center for Cosmology and AstroParticle Physics (the Ohio State University; 2008-2011). His research interests fall in the broad category of galaxy formation and evolution, in particular galaxies in the early universe, the mass assembly history of galaxies through cosmic time, and the role of dust-embedded star formation in galaxy evolution.