The Intrinsic Three Dimensional Shape of the Local Group Dark Matter Halo
May, 200610 pages
Published in:
- Mon.Not.Roy.Astron.Soc. 389 (2008) 1001-1007
e-Print:
- astro-ph/0605249 [astro-ph]
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Abstract: (arXiv)
The Local Group is a small galaxy cluster with the membership of 47 nearby galaxies including our Milky Way. Through statistical analysis of the Local Group data, we find that the positions of the member galaxies in the center of luminosity frame are preferentially aligned with the line in the direction of the equatorial coordinate, alpha=21^{h}18^{m}.56 and delta=59^{o}7^{'}.15. Taking this direction as the major principal axis of the Local Group dark matter halo and measuring the degree of the anisotropy in the spatial distribution of the Local Group member galaxies, we estimate the two axial ratios of the Local Group dark matter halo with the help of the algorithm recently developed by Lee & Kang. It is shown that the Local Group dark matter halo has a prolate shape with the axial ratio of 0.5. It is concluded that our result provides a new clue to the dark matter distribution in the vicinity of our Milky Way.- COSMOLOGY THEORY
- LSS
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