Is the dark halo of our Galaxy spherical?

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  • 22 September 2003
Abstract
It has been recently claimed that the confined structure of the debris from the Sagittarius dwarf implies that the dark-matter halo of our Galaxy should be nearly spherical, in strong contrast with predictions from cold dark-matter (CDM) simulations, where dark halos are found to have typical density axis ratios of 0.5. In this letter, numerical simulations are used to show that the Sagittarius streams are too young dynamically to be sensitive to the shape of the dark halo of the Milky Way. The data presently available are entirely consistent with a Galactic dark-matter halo that could either be oblate or prolate, with density axis ratios c/a that range from 0.55 to 1.45.

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