Comparing the observable properties of dwarf galaxies on and off the Andromeda plane

Abstract

The thin, extended planes of satellite galaxies detected around both the Milky Way and Andromeda are not a natural prediction of the LCDM paradigm. Galaxies in these distinct planes may have formed and evolved in a different way (e.g., tidally) to their off-plane neighbours. 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 2 on-plane M31 dSphs (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.

7 pages, 3 figures, accepted for publication in ApJ Letters

References in corpus (14)

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Cited by in corpus (28)

• One Law To Rule Them All: The Radial Acceleration Relation of Galaxies
• The PAndAS view of the Andromeda satellite system - II. Detailed properties of 23 M31 dwarf spheroidal galaxies
• A detailed study of Andromeda XIX, an extreme local analogue of ultra diffuse galaxies
• The Lopsidedness of Satellite Galaxy Systems in $\Lambda$CDM simulations
• The ISLAnds Project III: Variable Stars in Six Andromeda Dwarf Spheroidal Galaxies
• 3D hydrodynamic simulations for the formation of the Local Group satellite planes
• Toward an internally consistent astronomical distance scale
• On the Stability of Satellite Planes I: Effects of Mass, Velocity, Halo Shape and Alignment
• Flattened structures of dwarf satellites around massive host galaxies in the MATLAS low-to-moderate density fields
• The mass-metallicity relation of tidal dwarf galaxies
• The properties of dwarf spheroidal galaxies in the Cen A group: Stellar populations, internal dynamics, and a heart-shaped Halpha ring
• Star formation history of And XVIII: a dwarf spheroidal galaxy in isolation
• The intrinsic ellipticity of dwarf spheroidal galaxies: constraints from the Andromeda system
• A portrait of the Vast Polar Structure as a young phenomenon: hints from its member satellites
• A correlation between the number of satellites and the baryonic bulge-to-total ratio extending beyond the Local Group
• Sizing from the Smallest Scales: The Mass of the Milky Way
• Is the vast polar structure of dwarf galaxies a serious problem for lambda cold dark matter?
• The shapes and alignments of the satellites of the Milky Way and Andromeda
• On the absence of backsplash analogues to NGC 3109 in the $\Lambda$CDM framework
• Spectroscopic confirmation of the dwarf spheroidal galaxy d0944+71 as a member of the M81 group of galaxies
• A modern view of galaxies and their stellar populations
• Universal subhalo accretion in cold and warm dark matter cosmologies
• Planes of satellites around simulated disk galaxies II: Time-persistent planes of kinematically-coherent satellites in $\Lambda$CDM
• Detection and characterization of detached tidal dwarf galaxies
• Dark sector domain walls could explain the observed planes of satellites
• Effects of coplanar satellite bands on galactic disc evolution
• The long-term stability of the Vast Polar Structure and its connection to a possible previous passage of the LMC
• Are disks of satellites comprised of tidal dwarf galaxies?