Abstract：Studying the distribution and properties of hot gas around galaxies (hot CGM) helps constrain the galaxy evolution models but its observation is challenging. The first four SRG/eROSITA all-sky surveys (eRASS:4) allow us to detect the hot CGM by stacking a large sample of galaxies. In this talk, I will present the results we obtained: 1) X-ray surface brightness profiles and baryon budget of the hot CGM, 2) the relationship between the X-ray luminosity of the hot CGM and the stellar mass or halo mass of galaxies, 3) difference of the hot CGM around star-forming and quiescent galaxies.
Bio：Yi Zhang is a PHD student at the Max Planck Institute for Extraterrestrial Physics (MPE) in Germany. She works on the eROSITA data and explores the hot circumgalactic medium around galaxies. Before coming to MPE, she studied at Nanjing University and worked on the cosmic-ray transport models.