学术报告—The integrated metallicity profile of the Milky Way

ABSTRACT

The heavy element abundance profiles of galaxies place stringent constraints on galaxy growth and assembly history. Low-redshift galaxies generally have a negative metallicity gradient in their gas and stars. Such gradients are thought to be a natural manifestation of galaxy inside-out formation. As the Milky Way is currently the only spiral galaxy in which we can measure temporally-resolved chemical abundances, it enables unique insights into the origin of metallicity gradients and their correlation with the growth history of galaxies. However, until now, these abundance profiles have not been translated into the integrated-light measurements that are needed to compare the Milky Way with the general galaxy population. In this talk I will introduce our recent work in which we report this measurement of the light-weighted, integrated stellar metallicity profile of our Galaxy using a large sample of stars with chemical abundance measurements from the SDSS-IV/APOGEE survey.  

BIO

Jianhui obtained his PhD from University of Science and Technology of China in 2016. After graduation he has been doing postdoc in many places, including University of Portsmouth, University of Utah, and Max Planck Institute for Astronomy, until this February. Since then, he joined the South-Western Institute For Astronomy Research at Yunnan University as a faculty member. His research interests are mainly about the chemical evolution and structure of the Milky Way and external galaxies and what’s the position of the Milky Way in the general galaxy population.