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The Gaia astrometric mission may offer an unprecedented opportunity todiscover new tidal streams in the Galactic halo. To test this, we apply nGC3, agreat-circle-cell count method that combines position and proper motion data toidentify streams, to ten mock Gaia catalogues of K giants and RR Lyrae starsconstructed from cosmological simulations of Milky Way analogues. We analysetwo sets of simulations, one using a combination of $N$-body andsemi-analytical methods which has extremely high resolution, the other usinghydro-dynamical methods, which captures the dynamics of baryons, including theformation of an in situ halo. These ten realisations of plausible Galacticmerger histories allow us to assess the potential for the recovery of tidalstreams in different Milky Way formation scenarios. We include theGaia~selection function and observational errors in these mock catalogues. Wefind that the nGC3 method has a well-defined detection boundary in the space ofstream width and projected overdensity, that can be predicted based on directobservables alone. We predict that about 4-13 dwarf galaxy streams can bedetected in a typical Milky Way-mass halo with Gaia+nGC3, with an estimatedefficiency of $>$80\% inside the detection boundary. The progenitors of thesestreams are in the mass range of the classical dwarf galaxies and may have beenaccreted as early as redshift $\sim3$. Finally, we analyse how differentpossible extensions of the Gaia mission will improve the detection of tidalstreams.

Predictions for the detection of Tidal Streams with Gaia using Great Circle Methods