Andrew Wetzel edited quiescent_fraction.tex  about 9 years ago

Commit id: 7d76dce10c6133ca6623dffea1e2d2bb1184a0fd

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Of the 56 satellites, only 4 (7\%) are star-forming/gas-rich: the LMC and SMC around the MW, LGS 3 and IC 10 around 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 satellite dwarfs in the LG contrast strongly with the effectively \emph{zero} quiescent fraction for dwarf galaxies that are isolated ($>1500\kpc$ isolated, that is, $>1500\kpc$  from a more massive host) host  \citep{Geha2012, Phillips2014} Phillips2014},  and thus are not/were never satellites. The only known exception is KKR 25, a quiescent dwarf spheroidal with $\mstar=1.4\times10^6\msun$ that is $1853\kpc$ from M31.