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Andrew Wetzel edited quenching_time.tex
about 9 years ago
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As explored in \citet{Wetzel2015}, many satellite dwarf galaxies first fell into a another host halo (group), typically of $\mvir=10^{10-12}\msun$, before falling into the MW/M31 halo.
Because the importance this environmental preprocessing in such lower-mass groups remains unclear, we present the inferred environmental quenching timescales both including and neglecting such group preprocessing.
Thus, the left panel of Figure~\ref{fig:quench_times} uses time since infall into the MW/M31 halo, ignoring group preprocessing, while the right panel uses time since infall into \emph{any} host halo, including group preprocessing.
The latter necessarily results in longer quenching timescales, though it primarily shifts the upper
68\% 16\% of the distribution.
Both panels suggests shorter quenching timescales for less massive satellite dwarfs: $\sim5\gyr$ at $\mstar=10^{8-9}\msun$, $2-3\gyr$ at $\mstar=10^{7-8}\msun$, and $<1.5\gyr$ at $\mstar<10^7\msun$, depending on the importance of group preprocessing.
Moreover, the median timescale for two of the lowest $\mstar$ bins is $0\gyr$ because of the 100\% quiescent fractions there, which implies that quenching must be extremely rapid to eliminate all star-forming satellites (modulo uncertainty from the limited number of observed satellites).