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Title: Near-infrared Observational Studies of the Intermediate- and High-redshift Galaxies with HST and JWST
Speaker: Dr. Jeong Hwan Lee / Seoul National University
Date & Time: 2024-12-17, 4:00 PM
Location: Science Hall 638
Talk to be delivered in English
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Abstract: Near-infrared (NIR) observations are useful for studying galaxeis in the early universe, as NIR wavelengths are sensitive to the redshifted stellar light from distant galaxies and less affected by interstellar and intergalactic extinction. In this talk, I will discuss two key studies using Hubble Space Telescope (HST) and James Webb Space Telescope (JWST): (1) the properties of low surface brightness galaxies, specifically ultra-diffuse galaxies (UDGs), in the intermediate-redshift universe (z~0.3), and (2) the morphological distributions of galaxies in the high-redshift universe (z~1-8). Our HST study on UDGs revealed that UDGs in massive clusters at z~0.3 exhibit similar properties to their local counterparts, with most having dwarf-like origins. For high-redshift galaxies, our HST and JWST analysis suggested that the initial morphologies of galaxies in the cosmic morning (z>4) are predominantly disk-like. Leveraging the deep and high-resolution images of these NIR space telescopes, we aim to further investigate the environmental effects on galaxies in the early universe.
