Is the dark halo of our Galaxy spherical?

Details Is the dark halo of our Galaxy spherical? Is the dark halo of our Galaxy spherical?

2003-09-22

arxiv.org/abs/astro-ph/0309579v2

Mon.Not.Roy.Astron.Soc.351:643,2004

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, MNRAS in press. Various changes to the discussion section, typos fixed, 2 new figures and more references

Scientific paper

10.1111/j.1365-2966.2004.07812.x

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 0.6 - 0.8. In this letter, numerical simulations are used to show that the Sagittarius streams discovered thus far 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 minor-to-major density axis ratios c/a as low as 0.6 within the region probed by the orbit of the Sagittarius dwarf.

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