Mongardi, C.C.MongardiVIEL, MATTEOMATTEOVIELD'ODORICO, ValentinaValentinaD'ODORICOKim, T. -S.T. -S.KimBarai, P.P.BaraiMURANTE, GiuseppeGiuseppeMURANTEMonaco, PierluigiPierluigiMonaco2021-01-292021-01-2920180035-8711http://hdl.handle.net/20.500.12386/30108We characterize the properties of the intergalactic medium (IGM) around a sample of galaxies extracted from state-of-the-art hydrodynamical simulations of structure formation in a cosmological volume of 25 Mpc comoving at z∼ 2. The simulations are based on two different subresolution schemes for star formation and supernova feedback: the Multi-Phase Particle Integrator (MUPPI) scheme and the Effective Model. We develop a quantitative and probabilistic analysis based on the apparent optical depth method of the properties of the absorbers as a function of impact parameter from their nearby galaxies: in such a way, we probe different environments from circumgalactic medium to low-density filaments. Absorbers' properties are then compared with a spectroscopic observational data set obtained from high-resolution quasar spectra. Our main focus is on the N_{C IV}-N_{H I} relation around simulated galaxies: the results obtained with MUPPI and the Effective model are remarkably similar, with small differences only confined to regions at impact parameters b = [1 - 3] × r<SUB>vir</SUB>. Using C IV as a tracer of the metallicity, we obtain evidence that the observed metal absorption systems have the highest probability to be confined in a region of 150-400kpc around galaxies. Near-filament environments have instead metallicities too low to be probed by present-day telescopes, but could be probed by future spectroscopical studies. Finally, we compute C IV covering fractions which are in agreement with observational data.STAMPAenArticle10.1093/mnras/sty12832-s2.0-85073076749000441282300031http://arxiv.org/abs/1706.06123v2https://academic.oup.com/mnras/article/478/3/3266/49999122018MNRAS.478.3266MFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_8 Formation and evolution of galaxies