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We show that the position of the central dark matter density peak may beexpected to differ from the dynamical center of the Galaxy by several hundredparsec. In Eris, a high resolution cosmological hydrodynamics simulation of arealistic Milky-Way-analog disk galaxy, this offset is 300 - 400 pc (~3gravitational softening lengths) after z=1. In its dissipationlessdark-matter-only twin simulation ErisDark, as well as in the Via Lactea II andGHalo simulations, the offset remains below one softening length for most ofits evolution. The growth of the DM offset coincides with a flattening of thecentral DM density profile in Eris inwards of ~1 kpc, and the direction fromthe dynamical center to the point of maximum DM density is correlated with theorientation of the stellar bar, suggesting a bar-halo interaction as a possibleexplanation. A dark matter density offset of several hundred parsec greatlyaffects expectations of the dark matter annihilation signals from the GalacticCenter. It may also support a dark matter annihilation interpretation of recentreports by Weniger (2012) and Su & Finkbeiner (2012) of highly significant 130GeV gamma-ray line emission from a region 1.5 degrees (~200 parsec projected)away from Sgr A* in the Galactic plane.

An Off-center Density Peak in the Milky Way's Dark Matter Halo?