Host: Ying Zu
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Abstract:

In the last 20 years, a large number of stellar streams — structures created by disrupted dwarf galaxies and globular clusters — have been discovered around the Milky Way and Andromeda galaxies. In this talk, I will describe what these streams can tell us about the accretion history of the Milky Way, the gravitational potential, how it changes over time, as well as the distribution of dark matter in our Galaxy and M31. Also in my talk I will touch upon the impact of large spectroscopic surveys such as DESI will have on mapping the population of stellar streams. I will describe the recent release of DESI DR1 stellar catalogue with more than 4 million stars with accurate radial velocities and stellar parameter measurements.

Biography:

Prof. Koposov obtained his Bachelor’s degree from Moscow State University in 2006 and his PhD from the University of Heidelberg in 2009. Following that, he joined the Institute of Astronomy at the University of Cambridge as a research associate and was awarded the Ernest Rutherford Fellowship in 2016. He moved to Carnegie Mellon University as an assistant professor at the McWilliams Center for Cosmology and was promoted to associate professor in 2020. He then moved back to the Institute for Astronomy at the University of Edinburgh as a  Reader in Observational Astronomy and was promoted to professor and a personal chair of astronomy in 2024. Dr. Koposov is an expert in Galactic archaeology, Milky Way structure, and Hyper-velocity stars, and he has been interested in applying advanced techniques in Statistics, Machine Learning, Big data to Large surveys and Spectroscopy.