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Andrew Wetzel edited abstract.tex
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This near dichotomy implies that environmental processes within the halos of the MW and M31 \emph{rapidly} remove gas and quench star formation in satellites after infall.
We combine the observed high quiescent fractions for satellites of the MW/M31 with the virial-infall times of satellites in the ELVIS suite of cosmological simulations of MW/M31-like halos to infer the typical timescales over which environmental processes quench satellite dwarf galaxies after infall.
The quenching timescales at $\mstar<10^8\msun$ are short: $< 2 - 3 \gyr$, depending on whether environmental preprocessing in lower-mass groups is important.
We compare with the timescales for more massive satellites from the literature, which suggests that environmental quenching timescales increase rapidly with satellite mass to $\approx 9.5\gyr$ at $\mstar \approx 10 ^ 9 \msun$ but then rapidly decrease to
$\less 5\gyr$ $<5\gyr$ at $\mstar>5\times 10^9\msun$.
Thus, Magellanic-Cloud-mass satellites have the longest environmental quenching timescales.