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suppose the object was moving through our local space, which, while relative to our atmoshpere is a vaccuum, is not a pure vaccuum. as these galaxies travel into deeper space, the vaccuum may be more PURE. therefore, the relative resistance to it's motion is less, causing a PERCEIVED acceleration as these objects encounter increasingly less resistance.
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I'm a Comp-Sci major, math minor, but if I had a sub-minor, it would be physics.
There are several issues with that. First, the diminishment of resistance doesn't speed anything up unless there is a force pushing through the resistance. If something moving in space enters an area with zero resistance, it will continue moving at the speed at which it entered. Second, I greatly doubt that interstellar particles would produce a measurable effect on the acceleration of galaxies. Third, as far as I understand, galaxies aren't actually expanding into an area of empty space. Space itself is expanding, including the space between galaxies. I'm not well versed enough to explain it, so
look here. Of course, this theory allows for a universe which curves back on itself, which would explain the seemingly infinite number of galaxies the further away we look.