deletions | additions       diff --git a/observations.tex b/observations.tex  index 07e2882..e56ebb8 100644  --- a/observations.tex  +++ b/observations.tex 
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The catalog includes the distance of each galaxy from both the MW and M31, and we define ``satellites'' as those within $300\kpc$ of either host, motivated by the sharp transition in star formation, gas, and morphological properties within this distance.  $300\kpc$ also coincides with the median virial radius, $\rvir$, for our simulated MW/M31 halos (see below).  In addition to the data in \citet{McConnachie2012}, we also include the more recent measurements or upper limits of cold atomic gas mass from \citet{Spekkens2014}.  We do not include the recently discovered ultra-faint satellites of the MW from the Dark Energy Survey \citep{Koposov2015, DES2015}, though if they are all quiescent galaxies, their inclusion would barely not  change our results. Observed dwarf galaxies show a tight correlation between their morphology, star formation, and cold gas content, such that all(?) of the  dwarf spheroidals have little-to-no detectable gas or ongoing star formation, and all (?) most  of the dwarf irregulars have a significant fraction of their baryonic mass in cold gas and ongoing star formation. formation \textbf{XXX stochastic sampling of the IMF at low SFRs makes this statement a little tricky XXX}.  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 ($\mstar=1.5\times10^9\msun$, $\mgas/\mstar\approx0.3$) and SMC ($\mstar=4.6\times10^8\msun$, $\mgas/\mstar\sim1$) around the MW, and LGS 3 ($\mstar=9.6\times10^5\msun$, $\mgas/\mstar\approx0.4$) and IC 10 ($\mstar=9\times10^7$, $\mgas/\mstar\approx0.6$) 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}).  (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?) \textbf{XXX - I don't think you're glossing over anything important ~ DW XXX}  KaisinKarachentsev2013,2014 %KaisinKarachentsev2013,2014  for Halpha upper limits on satellites of M31. \textbf{XXX -Halpha is not a good indicator of recent star formation in dwarfs ~ DW XXX}