The observed X-ray luminosity–temperature (L_X–T) relation of hot gas in early-type galaxies deviates significantly from the prediction of purely gravitational heating, providing a key constraint on non-gravitational processes such as supernova (SN) and active galactic nucleus (AGN) feedback.
For the first time, we present the coupled time evolution of the depletion of both the hot and cool gas reservoirs after infall: satellites lose ∼90% of their hot CGM within ∼4.2^+0.6_-0.6 Gyr, increasing with residence time and independent of stellar mass.