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DID THE MILKY WAY DWARF SATELLITES ENTER THE HALO AS A GROUP?

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Manuel Metz1, Pavel Kroupa1, Christian Theis2, Gerhard Hensler2 and Helmut Jerjen3

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The dwarf satellite galaxies in the Local Group are generally considered to be hosted in dark matter subhalos that survived the disruptive processes during infall onto their host halos. It has recently been argued that if the majority of satellites entered the Milky Way (MW) halo in a group rather than individually, this could explain the spatial and dynamical peculiarities of its satellite distribution. Such groups were identified as dwarf galaxy associations that are found in the nearby universe. In this paper, we address the question whether galaxies in such associations can be the progenitors of the MW satellite galaxies. We find that the dwarf associations are much more extended than would be required to explain the disklike distribution of the MW and Andromeda satellite galaxies. We further identify a possible minor filamentary structure, perpendicular to the supergalactic plane, in which the dwarf associations are located, that might be related to the direction of infall of a progenitor galaxy of the MW satellites, if they are of tidal origin.


Keywords

galaxies: dwarf; galaxies: evolution; Galaxy: halo; Local Group


Dates

Issue 1 (2009 May 20)

Received 2008 December 15, accepted for publication 2009 March 2

Published 2009 May 1



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