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Andrew Wetzel edited quiescent_fraction.tex
about 9 years ago
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Of the 56 satellites, only 4 (7\%) are star-forming/gas-rich: LMC and SMC of the MW, LGS 3 and IC 10 of M31.
Moreover, at $\mstar<8\times10^7\msun$, only 1 (LGS 3) of the 51 satellites is star-forming, and at $\mstar<9\times10^5\msun$ \emph{all} 40 satellites are quiescent.
These near-unity quiescent fractions for satellites of the MW/M31 contrast strongly with the nearly \emph{zero} quiescent fraction observed for isolated (non-satellite) galaxies at $\mstar<10^9\msun$
\citep[][see Introduction]{Geha2012, \citep{Geha2012, Phillips2014}.
The only clear exceptions are the quiescent galaxies KKR 25 ($\mstar=1.4\times10^6\msun$) and KKs 3 ($\mstar=2.3\times10^7\msun$) at $\approx2\mpc$ from the MW/M31, although the limited completeness at $\mstar\lesssim10^6\msun$ beyond $300\kpc$ \citep{Tollerud2008, Hargis2014} leaves open the possibility for more such galaxies.