I will discuss past and current efforts to simulate the circumgalactic medium around galaxies, I will review theoretical predictions for its physical properties and impact on galaxy evolution and I will contrast these with results and future opportunities about the hot phase of such a halo gas around galaxies.
The first all-sky maps of high ionization lines observed in X-rays by eROSITA provide an excellent probe for the study of the hot phase (T ∼ 10^6 K) of the Milky Way (MW) circumgalactic medium (CGM). In this work we analyse the OVII and OVIII line detected in the eROSITA data. We fit sky maps made in narrow energy bins around the lines, with physical emission models embedded in a 3D geometry...
Low-mass galaxy groups are the most common environments for galaxies in the Universe, and they provide a crucial link between cosmology and galaxy evolution. However, their hot gas and baryon content are poorly constrained by current X-ray observations due to their low surface brightness. In this talk, I will demonstrate the efficiency of X-ray spectral stacking as a method to overcome these...
The CGM's hot phase probes the modern puzzles of galaxy formation and evolution as galaxies' feedback processes imprint their signatures in its volume-filling hot gas distribution. This talk presents state-of-art observed hot gas profiles of the CGM in Milky-Way-sized halos, obtained with the depth of eRASS:4 and the large area optical coverage of the LSS DR10 galaxy survey. Together with...
