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In this Letter, we revisit the idea of reionization feedback on dwarf galaxy formation. We show that primordial minihaloes with   v  cir  &lt; 20 km s −1   stop accreting gas after reionization, as it is usually assumed, but in virtue of their increasing concentration and the decreasing temperature of the intergalactic medium as redshift decreases below   z = 3 , they have a late phase of gas accretion and possibly star formation. We expect that pre‐reionization fossils that evolved on the outskirts of the Milky Way or in isolation show a bimodal star formation history with 12‐ and &lt;10‐Gyr old population of stars. Leo T fits with this scenario. Another prediction of the model is the possible existence of a population of gas‐rich minihaloes that never formed stars. More work is needed to understand whether a subset of compact high‐velocity clouds can be identified as such objects or whether an undiscovered population of dark galaxies exists in the voids between galaxies.

Late gas accretion on to primordial minihaloes: a model for Leo T, dark galaxies and extragalactic high‐velocity clouds