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We present predictions, derived from the EAGLE LCDM cosmologicalhydrodynamical simulations, for the abundance and properties of galaxiesexpected to be detected at high redshift by the James Webb Space Telescope(JWST). We consider the galaxy population as a whole and focus on thesub-population of progenitors of Milky Way (MW) analogues, defined to begalaxies with accretion histories similar to the MW's, that is, galaxies thatunderwent a merger resembling the Gaia-Enceladus-Sausage (GES) event and thatcontain an analogue of the Large Magellanic Cloud (LMC) satellite today. Wederive the luminosity function of all EAGLE galaxies in JWST NIRCam passbands,in the redshift range z=2-8, taking into account dust obscuration and differentexposure times. For an exposure time of $T=10^5$s, average MW progenitors areobservable as far back as z~6 in most bands, and this changes to z~5 and z~4for the GES and LMC progenitors, respectively. The progenitors of GES and LMCanalogues are, on average, ~2 and ~1 mag fainter than the MW progenitors atmost redshifts. They lie, on average, within ~60 and ~30 arcsec, respectively,of their future MW host at all times, and thus will appear within thefield-of-view of JWST NIRCam. We conclude that galaxies resembling the mainprogenitor of the MW and its major accreted components should be observablewith JWST beyond redshift 2, providing a new and unique window in studying theformation history of our own galaxy.

Observing EAGLE galaxies with JWST: predictions for Milky Way progenitors and their building blocks