Variable stellar initial mass function and its implications on galaxy chemical evolution


The stellar initial mass distribution function (IMF) is the most crucial assumption when interpreting the astronomy observations of stellar systems. Evidence has shown that the IMF is not universal nor invariant. In this talk, I will introduce the IGIMF theory that explains and predicts the IMF variation as a function of star formation intensity and gas metallicity. The galaxy-wide IMF can be calculated accordingly using the open-source GalIMF code (Python3 we developed. The application of IGIMF on the galaxy chemical evolution of massive elliptical galaxies and ultra-faint dwarf galaxies have shown excellent agreement with observation, providing the best explanation of the element abundance for these galaxies so far.


Zhiqiang YAN @ Charles University, Czech Republic
Meeting ID: 731 2099 7847, Password: astroPKU
Wednesday, July 1, 2020 - 2:00PM to Wednesday, July 1, 2020 - 2:30PM