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Large-scale faint structure detected by the recent observations in the haloof the Andromeda galaxy (M31) provides an attractive window to explore thestructure of outer cold dark matter (CDM) halo in M31. Using an N-bodysimulation of the interaction between an accreting satellite galaxy and M31, weinvestigate the mass density profile of the CDM halo. We find the sufficientcondition of the outer density profile of CDM halo in M31 to reproduce theAndromeda giant stream and the shells at the east and west sides of M31. Theresult indicates that the density profile of the outer dark matter halo of M31is a steeper than the prediction of the theory of the structure formation basedon the CDM model.

Resolving the outer density profile of dark matter halo in Andromeda galaxy