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Studies of the halo gas in the Milky Way and in nearby spiral galaxies showthe presence of gas complexes that cannot be reconciled with an internal(galactic fountain) origin and are direct evidence of gas accretion. Estimatinggas accretion rates from these features consistently gives values, which areone order of magnitude lower than what is needed to feed the star formation. Ishow that this problem can be overcome if most of the accretion is in fact"hidden" as it mixes with the galactic fountain material coming from the disk.This model not only provides an explanation for the missing gas accretion butalso reproduces the peculiar kinematics of the halo gas in particular thevertical rotation gradient. In this view this gradient becomes indirectevidence for gas accretion.

New evidence for halo gas accretion onto disk galaxies