Andrew Wetzel edited quiescent_fraction.tex  about 9 years ago

Commit id: ef4bfd44f3fe8ebd4991a379d5cb5f345f28d822

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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 effectively \emph{zero} quiescent fraction for isolated (non-satellite)dwarf  galaxies at $\mstar<10^9\msun$  \citep{Geha2012, Phillips2014}, as outlined in the Introduction. (The only known exception is KKR 25, a quiescentdwarf  spheroidal with $\mstar=1.4\times10^6\msun$ that is $1853\kpc$ from M31.)