D'ODORICO, ValentinaValentinaD'ODORICO2024-12-102024-12-1020230922-6435http://hdl.handle.net/20.500.12386/35441The cosmological and galactic missing baryon problems are briefly reviewed with a particular focus on the contributions to the baryonic census derived from the analysis of quasar absorption spectra. The CUBES spectrograph foreseen for the ESO VLT, with its exceptional efficiency (> 40 %), blue wavelength coverage (λ≃ 300 - 405 nm) and intermediate resolution (R≃ 24 , 000) will allow us to tackle this issue with two approaches: using H i Lyman-α lines at z≃ 1.5 - 2.3 , just after the peak of star formation, and using O vi absorbers at z≃ 1.9 - 2.9 , at the cosmic noon. In both cases, in order to derive the baryonic masses it will be necessary to acquire also higher-resolution spectra of the same target quasars to cover the region at longer wavelengths. We simulate the observations with the CUBES E2E simulator considering a sample of 40 bright quasars at redshifts zem∼ 2 - 3 observed for a total time of ∼ 13 h to reach a signal-to-noise ratio of ∼ 15 in the H i Lyman-α, O vi forests.STAMPAenArticle10.1007/s10686-022-09859-42-s2.0-85129225274https://link.springer.com/article/10.1007/s10686-022-09859-4https://api.elsevier.com/content/abstract/scopus_id/85129225274FIS/05 - ASTRONOMIA E ASTROFISICA