Effect of dark matter halo substructures on galaxy rotation curves

Details Effect of dark matter halo substructures on galaxy rotation curves Effect of dark matter halo substructures on galaxy rotation curves

2010-09-10

arxiv.org/abs/1009.2099v1

2010, ApJ, 723, 781

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 pages, 3 figures. Accepted for publication in ApJ. The definitive version will be available at http://iopscience.iop.org/

Scientific paper

10.1088/0004-637X/723/1/781

The effect of halo substructures on galaxy rotation curves is investigated in this paper using a simple model of dark matter clustering. A dark matter halo density profile is developed based only on the scale free nature of clustering that leads to a statistically self-similar distribution of the substructures at galactic scale. Semi-analytical method is used to derive rotation curves for such a clumpy dark matter density profile. It is found that the halo substructures significantly affect the galaxy velocity field. Based on the fractal geometry of the halo, this self-consistent model predicts an NFW-like rotation curve and a scale free power spectrum of the rotation velocity fluctuations.

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