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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 730306.0, MPI für Astronomie / Publikationen_mpia
Comparing the observable properties of dwarf galaxies on and off the Andromeda plane
Authors:Collins, M. L. M.; Martin, N. F.; Rich, R. M.; Ibata, R. A.; Chapman, S. C.; McConnachie, A. W.; Ferguson, A. M.; Irwin, M. J.; Lewis, G. F.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:The Astrophysical Journal Letters
Issue / Number:1
Start Page:id. L13 (6 pp)
Audience:Not Specified
Abstract / Description:The thin, extended planes of satellite galaxies detected around both the Milky Way and Andromeda are not a natural prediction of the Λ-cold dark matter paradigm. Galaxies in these distinct planes may have formed and evolved in a different way (e.g., tidally) from their off-plane neighbors. If this were the case, one would expect the on- and off-plane dwarf galaxies in Andromeda to have experienced different evolutionary histories, which should be reflected by the chemistries, dynamics, and star formation histories of the two populations. In this work, we present new, robust kinematic observations for two on-plane M31 dwarf spheroidal galaxies (And XVI and XVII) and compile and compare all available observational metrics for the on- and off-plane dwarfs to search for a signal that would corroborate such a hypothesis. We find that, barring their spatial alignment, the on- and off-plane Andromeda dwarf galaxies are indistinguishable from one another, arguing against vastly different formative and evolutionary histories for these two populations.
Free Keywords:dark matter; galaxies: dwarf; galaxies: fundamental parameters; galaxies: kinematics and dynamics; Local Group
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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