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Photometric and spectroscopic observations of the Carina dSph revealed thatthis galaxy contains two dominant stellar populations of different age andkinematics. The co-existence of multiple populations provides new constraintson the dark halo structure of the galaxy, because different populations shouldbe in equilibrium in the same dark matter potential well. We developnon-spherical dynamical models including such multiple stellar components andattempt to constrain the properties of the non-spherical dark halo of Carina.We find that Carina probably has a larger and denser dark halo than found inprevious works and a less cuspy inner dark matter density profile, even thoughthe uncertainties of dark halo parameters are still large due to small volumeof data sample. Using our fitting results, we evaluate astrophysical factorsfor dark matter annihilation and decay and find that Carina should be one ofthe most promising detectable targets among classical dSph galaxies. We alsocalculate stellar velocity anisotropy profiles for both stellar populations andfind that they are both radially anisotropic in the inner regions, while in theouter regions the older population becomes more tangentially biased than theintermediate one. This is consistent with the anisotropy predicted from tidaleffects on the dynamical structure of a satellite galaxy and thereby can beconsidered as kinematic evidence for the tidal evolution of Carina.

Dark halo structure in the Carina dwarf spheroidal galaxy: joint analysis of multiple stellar components