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COMPARING THE OBSERVABLE PROPERTIES OF DWARF GALAXIES ON AND OFF THE ANDROMEDA PLANE

Collins, MLM, Martin, NF, Rich, RM, Ibata, RA, Chapman, SC, McConnachie, AW, Ferguson, AM, Irwin, MJ and Lewis, GF (2015) COMPARING THE OBSERVABLE PROPERTIES OF DWARF GALAXIES ON AND OFF THE ANDROMEDA PLANE The Astrophysical Journal Letters, 799, L13.

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Abstract

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 onand 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.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Collins, MLMUNSPECIFIEDUNSPECIFIED
Martin, NFUNSPECIFIEDUNSPECIFIED
Rich, RMUNSPECIFIEDUNSPECIFIED
Ibata, RAUNSPECIFIEDUNSPECIFIED
Chapman, SCUNSPECIFIEDUNSPECIFIED
McConnachie, AWUNSPECIFIEDUNSPECIFIED
Ferguson, AMUNSPECIFIEDUNSPECIFIED
Irwin, MJUNSPECIFIEDUNSPECIFIED
Lewis, GFUNSPECIFIEDUNSPECIFIED
Date : 20 January 2015
Identification Number : 10.1088/2041-8205/799/1/L13
Copyright Disclaimer : Copyright 2015. The American Astronomical Society. All rights reserved.
Uncontrolled Keywords : dark matter – galaxies: dwarf – galaxies: fundamental parameters – galaxies: kinematics and dynamics – Local Group
Depositing User : Symplectic Elements
Date Deposited : 03 Aug 2016 14:23
Last Modified : 03 Aug 2016 14:23
URI: http://epubs.surrey.ac.uk/id/eprint/811372

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