simulations of the Milky Way and Sagittarius stream

摘要: We analyze self-consistentN-body simulations of the Milky Way disk and ongoing disruption Sagittarius dwarf satellite to study e!ect tidal debris on dark matter detection experiments. In agreement with significant previous work, we reiterate that standard halo model is insu"cient describe non-Maxwellian velocity distribution in our equilibrium halo-only halo/galaxy models, o!er suggestions for correcting this discrepancy. Moreimportantly, emphasize component leading arm significantly more extended than stellar arm, also thatthe streams are not necessarily coaxial may be o!set by several kpc at point which they impact Galactic disk. This suggests mattercomponent likely have a non-negligible influence experiments even when thestellardebris centered from solar neighborhood. Relative models without an infalling dwarf, induces energy-dependent enhancement direct search event rates as much !20-45%, reduction amplitude annual modulation rate factor two, shift phase as!20 days, recoil energy reverses phase. These influences general interest interpretation searches, but particularly important case relatively light (m ! !20GeV/c 2 ) because stream impacts system high speed compared primary matter.