Andrew Wetzel edited observations.tex  about 9 years ago

Commit id: 84c099eadbd0e370e372101ffc092544b8b795c4

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Thus, we define ``quiescent'' satellites as those that have $\mgas / \mstar < 0.1$ or are classified as having spheroidal morphology if they have no cold gas constraints.  Thus, by this definition, the only star-forming, gas-rich satellites in the LG are: LMC ($\mstar = 1.5 \times 10^9 \msun$, $\mgas / \mstar \approx 0.3$) and SMC ($\mstar = 4.6 \times 10^8 \msun$, $\mgas / \mstar \sim 1$) around the MW, and LGS 3 ($\mstar = 9.6 \times 10 ^ 5 \msun$, $\mgas / \mstar \approx 0.4$) and IC 10 ($\mstar = 9 \times 10 ^ 7$, $\mgas / \mstar \approx 0.6$) around M31.  (While Sculptor has $\mgas / \mstar \approx 0.096$, we consider it quiescent based on its morphology and lack of recent star formation \citep{Weisz2014a}).  \comment{Dan (Dan  or Erik - can you say something about comparing these cuts with either SFR metrics or SFHs? Specifically, I am glossing over any ambiguous systems?} systems?)  In examining the fraction of satellites that are quiescent, we group them into 1-dex bins of $\mstar$.  We do not attempt any correction for observational completeness as a function of $\mstar$, but we do take into account the maximum observed distance at each $\mstar$ when we compare with the simulations (see below).