Are Great Disks Defined by Satellite Galaxies in Milky-Way Type Halos Rare in $Λ$CDM model?

Details Are Great Disks Defined by Satellite Galaxies in Milky-Way Type Halos Rare in $Λ$CDM model? Are Great Disks Defined by Satellite Galaxies in Milky-Way Type Halos Rare in $Λ$CDM model?

2005-01-17

arxiv.org/abs/astro-ph/0501333v2

Astronomy and Astrophysics

Astrophysics

Major revised, new figure and text added, to appear in A&A

Scientific paper

10.1051/0004-6361:20052675

We study the spatial distribution of satellite galaxies by assuming that they follow the dark matter distribution. This assumption is supported by semi-analytical studies based on high-resolution numerical simulations. We find that for a Milky-Way type halo, if only a dozen satellite galaxies are observed, then they can lie on a ``great'' disk with an rms height of about 40 kpc. The normal to the plane is roughly isotropic on the sky. These results are consistent with the observed properties of the satellite galaxies in the Milky Way. If, however, the satellite galaxies follow the distribution of substructure selected by present mass, then great disks similar to the one in the Milky Way are rare and difficult to reproduce, in agreement with the conclusion reached by Kroupa et al. (2004).

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