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Andrew Wetzel edited figures/qu.frac_v_m.star_lg_mw_m31_gas.ratio.0.1/caption.tex
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\label{fig:quiescent_fraction}
For all observed dwarf galaxies that are satellites within
$300 \kpc \approx \rvir$ $300\kpc$ of the Milky Way (MW) or Andromeda
(M31) and have measured/constrained cold atomic gas mass, (M31), the fraction that are quiescent
(gas-poor) ($\mgas/\mstar<0.1$) versus stellar mass, $\mstar$.
We define quiescence as $\mgas / \mstar < 0.1$.
Blue circles show all satellites, while violet squares show those of the MW and green triangles show those of M31.
The only star-forming/gas-rich satellites are:
LMC ($\mstar=1.5\times10^9\msun$) and SMC ($\mstar=4.6\times10^8\msun$) around the MW, LGS 3
($\mstar = 9.6 \times 10 ^ 5 \msun$) ($\mstar=9.6\times10^5\msun$) and IC 10
($\mstar = 9 \times 10 ^ 7$) around M31; LMC ($\mstar = 1.5 \times 10 ^ 9 \msun$) and SMC ($\mstar = 4.6 \times 10 ^ 8 \msun$) ($\mstar=9\times10^7$) around
the MW. M31.
At
$\mstar < 8 \times 10 ^ 7 \msun$ $\mstar<8\times10^7\msun$, 50 of 51
observed satellites are
quiescent quiescent, and at
$\mstar < 9 \times 10 ^ 5 \msun$ $\mstar<9 \times10^5\msun$ \emph{all} are quiescent.
The error bars show 68\% uncertainty for a beta distribution \citep{Cameron2011} based on the observed counts.