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Planes of satellites around Milky Way/M31-mass galaxies in the FIRE simulations and comparisons with the Local Group | | Jenna Samuel
; Andrew Wetzel
; Sierra Chapman
; Erik Tollerud
; Philip F. Hopkins
; Michael Boylan-Kolchin
; Jeremy Bailin
; Claude-André Faucher-Giguère
; | | Date: |
16 Oct 2020 | | Abstract: | We examine the prevalence, longevity, and causes of planes of satellite dwarf
galaxies, as observed in the Local Group. We use 14 Milky
Way/Andromeda-(MW/M31) mass host galaxies from the FIRE-2 simulations. We
select the 14 most massive satellites by stellar mass within 300 kpc of each
host and correct for incompleteness from the foreground galactic disk when
comparing to the MW. We find that MW-like planes as spatially thin and/or
kinematically coherent as observed are uncommon, but they do exist in our
simulations. Spatially thin planes occur in 1-2 per cent of snapshots during
$z=0-0.2$, and kinematically coherent planes occur in 5 per cent of snapshots.
These planes are generally short-lived, surviving for < 500 Myr. However, if we
select hosts with an LMC-like satellite near first pericenter, the fraction of
snapshots with MW-like planes increases dramatically to 7-16 per cent, with
lifetimes of 0.7-3 Gyr, likely because of group accretion of satellites. We
find that M31’s satellite distribution is much more common: M31’s satellites
lie within about 1 sigma of the simulation median for every plane metric we
consider. We find no significant difference in average satellite planarity for
isolated hosts versus hosts in LG-like pairs. Baryonic and dark matter-only
simulations exhibit similar levels of planarity, even though baryonic subhalos
are less centrally concentrated within their host halos. We conclude that
planes of satellites are not a strong challenge to LCDM cosmology. | | Source: | arXiv, 2010.08571 | | Services: | Forum | Review | PDF | Favorites | |
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