Proper Motions of the Satellites of M31

Abstract

We predict the range of proper motions of 19 satellite galaxies of M31 that would rotationally stabilise the M31 plane of satellites consisting of 15-20 members as identified by Ibata et al. (2013). Our prediction is based purely on the current positions and line-of-sight velocities of these satellites and the assumption that the plane is not a transient feature. These predictions are therefore independent of the current debate about the formation history of this plane. We further comment on the feasibility of measuring these proper motions with future observations by the THEIA satellite mission as well as the currently planned observations by HST and JWST.

9 pages, 2 figures, 1 table

References in corpus (12)

• The Gaia mission
• The mass distribution and gravitational potential of the Milky Way
• A Vast Thin Plane of Co-rotating Dwarf Galaxies Orbiting the Andromeda Galaxy
• Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation
• The spatial distribution of the Milky Way and Andromeda satellite galaxies
• Gaia Data Release 1, Pre-processing and source list creation
• Discs of Satellites: the new dwarf spheroidals
• The Proper Motion of the Local Group Galaxy IC 10
• Vast planes of satellites in a high resolution simulation of the Local Group: comparison to Andromeda
• The Vast Polar Structure of the Milky Way Attains New Members
• Eppur si muove: Positional and kinematic correlations of satellite pairs in the low Z universe
• Convergence properties of $\eta \to 3\pi$ decays in chiral perturbation theory

Cited by in corpus (4)

• HST Proper Motions of NGC 147 and NGC 185: Orbital Histories and Test of Dynamically Coherent Andromeda Satellite Plane
• On the Co-Orbitation of Satellite Galaxies Along the Great Plane of Andromeda: NGC 147, NGC 185, and Expectations from Cosmological Simulations
• Classifying the satellite plane membership of Centaurus A's dwarf galaxies using orbital alignment constraints
• On the origin of the asymmetric dwarf galaxy distribution around Andromeda