摘要：Context.Galaxies are surrounded by extended gaseous halos that store significant fractions of chemical elements. These are syntethized by the stellar populations and later ejected into the circumgalactic medium (CGM) by different mechanism, of which supernova feedback is considered one of the most relevant.Aims.We aim to explore the properties of this metal reservoir surrounding star-forming galaxies in a cosmological context aiming to investigate the chemical loop between galaxies and their CGM, and the ability of the subgrid models to reproduce observational results.Methods.Using cosmological hydrodynamical simulations, we have analysed the gas-phase chemical contents of galaxies with stellar masses in the range109−1011M⊙. We estimated the fractions of metals stored in the different CGM phases, and the predicted O viand Si iiicolumn densities within the virial radius.Results.We find roughly107M⊙of oxygen in the CGM of simulated galaxies havingM⋆~ 1010M⊙, in fair agreement with the lower limits imposed by observations. TheMoxyis found to correlate withM⋆, at odds with current observational trends but in agreement with other numerical results. The estimated profiles of O vicolumn density reveal a substantial shortage of that ion, whereas Si iii, which probes the cool phase, is overpredicted. Nevertheless, the radial dependences of both ions follow the respective observed profiles. The analysis of the relative contributions of both ions from the hot, warm and cool phases suggests that the warm gas (105K
