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We make a first attempt to find dwarf galaxies in eight \Fermi-LAT extended,unassociated, source fields using \Gaia\ DR2. We probe previously unexploredheliocentric distances of $d<20$~kpc with an extreme-deconvolution (XD)technique. We find no signature of a dwarf galaxy in any of these fieldsdespite \Gaia's excellent astrometric accuracy. We estimate our detectionlimits by applying the XD method to mock data, obtaining a conservative limiton the stellar mass of $M_* < 10^4$~M$_{\sun}$ for $d < 20$\, kpc. Such a lowstellar mass implies either a low-mass subhalo, or a massive stripped-downsubhalo. We use an analytic model for stripped subhalos to argue that, giventhe sizes and fluxes of the \Fermi-LAT sources, we can reject the hypothesisthat they owe to dark matter annihilation.

A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter