Abstract : Galaxies are evolving ecosystems of multiple components which interplay with each other and are distributed over a wide range of spatial scale, from sub-galactic scales up to scales of dark matter halos. Therefore, in order to have a complete picture of galaxy formation and evolution, one has to obtain observational data with multiple wavebands and different spatial resolutions to probe physical processes both internal and external to galaxies. Integral field unit (IFU) surveys such as MaNGA and high-resoluting imaging surveys in different bands are providing resolved spectroscopy and SEDs for large samples of galaxies in the local Universe, allowing the stellar populations, dust attenuation and gas ionization, as well as star formation histories across the whole galaxy area to be studied with high accuracy. I will present our studies of local galaxies based on these data. If time allows, I'll extend to larger scales and briefly talk about the content of atomic gas and warm gas in/around low-z galaxies out to scales of dark matter halos.
Bio: Cheng Li is a Professor at Department of Astronomy, Tsinghua University in Beijing. Before he joined Tsinghua in September 2015, he worked at Shanghai Astronomical Observatory (SHAO) as a group leader (2010-2015), and at Max-Planck Institute for Astrophysics (2007-2010) and SHAO (2006-2007) as a postdoc. He obtained his PhD from University of Science and Technology of China (USTC) in 2006. His research covers a wide range of topics on the formation and evolution of galaxies, circumg-alactic medium and inter-galactic medium, as well as the large-scale structure of the Universe. He is a member of the SDSS-IV project (2014-2020) and the upcoming Subaru/PFS project. More information about Cheng Li can be found at https://lig.astro.tsinghua.edu.cn/.