On the correlation between the local dark matter and stellar velocities. (arXiv:1811.11763v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Bozorgnia_N/0/1/0/all/0/1">Nassim Bozorgnia</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fattahi_A/0/1/0/all/0/1">Azadeh Fattahi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cerdeno_D/0/1/0/all/0/1">David G. Cerdeno</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Frenk_C/0/1/0/all/0/1">Carlos S. Frenk</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gomez_F/0/1/0/all/0/1">Facundo A. Gómez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Grand_R/0/1/0/all/0/1">Robert J. J. Grand</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marinacci_F/0/1/0/all/0/1">Federico Marinacci</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pakmor_R/0/1/0/all/0/1">Rüdiger Pakmor</a>
The dark matter velocity distribution in the Solar neighbourhood is an
important astrophysical input which enters in the predicted event rate of dark
matter direct detection experiments. It has been recently suggested that the
local dark matter velocity distribution can be inferred from that of old or
metal-poor stars in the Milky Way. We investigate this potential relation using
six high resolution magneto-hydrodynamical simulations of Milky Way-like
galaxies of the Auriga project. We do not find any correlation between the
velocity distributions of dark matter and old stars in the Solar neighbourhood.
Likewise, there are no strong correlations between the local velocity
distributions of dark matter and metal-poor stars selected by applying
reasonable cuts on metallicity. In some simulated galaxies, extremely
metal-poor stars have a velocity distribution that is statistically consistent
with that of the dark matter, but the sample of such stars is so small that we
cannot draw any strong conclusions.
The dark matter velocity distribution in the Solar neighbourhood is an
important astrophysical input which enters in the predicted event rate of dark
matter direct detection experiments. It has been recently suggested that the
local dark matter velocity distribution can be inferred from that of old or
metal-poor stars in the Milky Way. We investigate this potential relation using
six high resolution magneto-hydrodynamical simulations of Milky Way-like
galaxies of the Auriga project. We do not find any correlation between the
velocity distributions of dark matter and old stars in the Solar neighbourhood.
Likewise, there are no strong correlations between the local velocity
distributions of dark matter and metal-poor stars selected by applying
reasonable cuts on metallicity. In some simulated galaxies, extremely
metal-poor stars have a velocity distribution that is statistically consistent
with that of the dark matter, but the sample of such stars is so small that we
cannot draw any strong conclusions.
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