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We simulate stacked observations of nearby hot X-ray coronae associated withgalaxies in the EAGLE and Illustris-TNG hydrodynamic simulations. A forwardmodeling pipeline is developed to predict 4-year eROSITA observations andstacked image analysis, including the effects of instrumental and astrophysicalbackgrounds. We propose an experiment to stack z~0.01 galaxies separated byspecific star-formation rate (sSFR) to examine how the hot (T>=10^6 K)circumgalactic medium (CGM) differs for high- and low-sSFR galaxies. Thesimulations indicate that the hot CGM of low-mass (M_*~10^{10.5} Msol),high-sSFR (defined as the top one-third ranked by sSFR) central galaxies willbe detectable to a galactocentric radius r~30-50 kpc. Both simulations predictlower luminosities at fixed stellar mass for the low-sSFR galaxies (the lowerthird of sSFR) with Illustris-TNG predicting 3x brighter coronae aroundhigh-sSFR galaxies than EAGLE. Both simulations predict detectable emission outto r~150-200 kpc for stacks centered on high-mass (M_*~10^{11.0} Msol)galaxies, with EAGLE predicting brighter X-ray halos. The extended soft X-rayluminosity correlates strongly and positively with the mass of circumgalacticgas within the virial radius (f_{CGM}). Prior analyses of both simulations haveestablished that f_{CGM} is reduced by expulsive feedback driven mainly byblack hole growth, which quenches galaxy growth by inhibiting replenishment ofthe ISM. Both simulations predict that eROSITA stacks should not onlyconclusively detect and resolve the hot CGM around L^* galaxies for the firsttime, but provide a powerful probe of how the baryon cycle operates, for whichthere remains an absence of consensus between state-of-the-art simulations.

EAGLE and Illustris-TNG predictions for resolved eROSITA X-ray observations of the circumgalactic medium around normal galaxies