  We analyze measurements of the thermal Sunyaev-Zeldovich (tSZ) effect arising
in the circumgalactic medium (CGM) of $L^*$ galaxies, reported by Bregman et
al. 2022 and Das et al. 2023. In our analysis we use the Faerman et al. 2017
and Faerman et al. 2020 CGM models, a new power-law model (PLM), and the TNG100
simulation. For a given $M_{\rm vir}$, our PLM has four parameters; the
fraction, $f_{\rm hCGM}$, of the halo baryon mass in hot CGM gas, the ratio,
$\phi_T$, of the actual gas temperature at the virial radius to the virial
temperature, and the power-law indicies, $a_{P,{\rm th}}$ and $a_n$ for the
thermal electron pressure and the hydrogen nucleon density. The B+22
Compton-$y$ profile implies steep electron pressure slopes ($a_{P,{\rm
th}}\simeq 2$). For isothermal conditions the temperature is at least
$1.1\times 10^6$ K, with a hot CGM gas mass of up to $3.5\times 10^{11}$
M$_\odot$ for a virial mass of $2.75\times 10^{12}$ M$_\odot$. However, if
isothermal the gas must be expanding out of the halos. An isentropic equation
of state is favored for which hydrostatic equilibrium is possible. The B+22 and
D+23 results are consistent with each other and with recent (0.5-2 keV) CGM
X-ray observations by Zhang et al. 2024 of Milky Way mass systems. For $M_{\rm
vir}\simeq 3\times 10^{12}$ M$_\odot$, the scaled Compton pressure integrals,
$E(z)^{-2/3}Y_{500}/M_{\rm vir,12}^{5/3}$, lie in the narrow range, $2.5\times
10^{-4}$ to $5.0\times 10^{-4}$ kpc$^2$, for all three sets of observations.
TNG100 underpredicts the tSZ parameters by factors $\sim 0.5$ dex for the $L^*$
galaxies, suggesting that the feedback strengths and CGM gas losses are
overestimated in the simulated halos at these mass scales.
