Astronomy departmental seminar - Natalia Lahen (MPIA)


The formation of star clusters in low-metallicity environments


Despite the efforts of observational surveys to map the formation sites
of globular clusters (GCs) at redshifts beyond z~2, the spatial
resolution even in the deepest lensing surveys will still be limited to
scales of parsecs. Numerical experiments with star forming environments
typical to high-redshift Universe are therefore needed to probe the
formation of GCs down to the details of their internal structure. In the
GRIFFIN project, we model the formation of stars, star clusters and GCs
in low-metallicity gas-rich dwarf galaxies. We use the SPHGal code,
modified from GADGET-3, that includes a chemical network to model the
low-temperature cooling of the multiphase ISM. Star formation and
feedback prescriptions include a fully realized IMF and feedback from
single stars. Using isolated and merging dwarf galaxy models, we are
able to follow the formation and evolution of star clusters within their
full galactic environments. I will discuss how massive star clusters up
to the mass range of GCs form in the most extreme star-forming
environments probed by our simulations. In our new simulations, we
implement the element-by-element enrichment of the ISM by stellar winds
and supernovae of massive stars, and investigate the build-up of
chemical variations within the stellar populations of massive star