SIMBAD references

We investigate formation processes and physical properties of globular cluster systems (GCSs) in galaxies based on high-resolution cosmological simulations with globular clusters. We focus on metal-poor clusters (MPCs) and correlations with their host galaxies by assuming that MPC formation is truncated at a high redshift (z_trun≥ 6). We find that the correlation between mean metallicities (Z_gc) of MPCs and their host galaxy luminosities (L) flattens from z = z_trun to 0. We also find that the observed relation (Z_gc∝ L^0.15) in MPCs can be reproduced well in the models with Z_gc∼ L^0.5 at z = z_trun when z_trun∼ 10, if mass-to-light ratios are assumed to be constant at z = z_trun. A flatter L-Z_gc at z = z_trunis found to be required to explain the observed relation for constant mass-to-light ratio models with lower z = z_trun. However, better agreement with the observed relation is found for models with different mass-to-light ratios between z = z_trun and 0. It is also found that the observed colour-magnitude relation of luminous MPCs (i.e. `blue tilts') may only have a small contribution from the stripped stellar nuclei of dwarf galaxies, which have nuclei masses that correlate with their total mass at z = z_trun. The simulated blue tilts are found to be seen more clearly in more massive galaxies, which reflects the fact that more massive galaxies at z = 0 are formed from a larger number of dwarfs with stellar nuclei formed at z > z_trun. The half-number radii (R_e) of GCSs, velocity dispersions of GCSs (σ) and their host galaxy masses (M_h) are found to be correlated with one another such that R_e∝ M_h^0.57 and σ ∝ M_h^0.32. Based on these results, we discuss the link between hierarchical merging histories of galaxies and the physical properties of MPCs, the origin of the L-Z_gc relation and non-homology of GCSs.