Detection of a universal core-halo transition in dwarf galaxies as predicted by Bose-Einstein dark matter. (arXiv:2010.10337v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Pozo_A/0/1/0/all/0/1">Alvaro Pozo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Broadhurst_T/0/1/0/all/0/1">Tom Broadhurst</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Martino_I/0/1/0/all/0/1">Ivan de Martino</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chiueh_T/0/1/0/all/0/1">Tzihong Chiueh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Smoot_G/0/1/0/all/0/1">George F. Smoot</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bonoli_S/0/1/0/all/0/1">Silvia Bonoli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Angulo_R/0/1/0/all/0/1">Raul Angulo</a>
Most nearby classical dwarf galaxies are now known to be surrounded by large
halos of stars extending to over $2~{rm kpc}$, adding to the puzzling
properties of these dark matter dominated galaxies. Here we show that
simulations of dark matter as a Bose Einstein condensate, $psi$DM, predict
large halos surrounding a soliton core with a marked density transition at the
core radius, set by the de Broglie wavelength. This transition is a prominent
hallmark of $psi$DM because the ground state forms a standing wave soliton
that is much denser than the halo of excited states. Here we identify this
predicted transition in the stellar profiles of dwarfs lying beyond the Milky
Way at a radius of $simeq 1.0~{rm kpc}$, corresponding to a boson mass of
$simeq 1.1^{+0.2}_{-0.1}times 10^{-22}{rm eV}$, assuming stars trace the
mass. Clear transitions are also evident for most classical dwarfs that orbit
the Milky Way, with pronounced amplitudes indicating significant tidal
stripping as anticipated in $psi$DM simulations of orbiting dwarfs (Schive,
Chieuh & Broadhurst 2020), where the halo is more easily stripped than the
stable soliton core. We conclude that $psi$DM accounts well for the observed
family of classical dwarf profiles with tidal stripping included, in contrast
to heavy particle, cold dark matter, CDM, where low mass galaxies should be
concentrated and core-less, quite unlike the extensive core-halo structure
observed.
Most nearby classical dwarf galaxies are now known to be surrounded by large
halos of stars extending to over $2~{rm kpc}$, adding to the puzzling
properties of these dark matter dominated galaxies. Here we show that
simulations of dark matter as a Bose Einstein condensate, $psi$DM, predict
large halos surrounding a soliton core with a marked density transition at the
core radius, set by the de Broglie wavelength. This transition is a prominent
hallmark of $psi$DM because the ground state forms a standing wave soliton
that is much denser than the halo of excited states. Here we identify this
predicted transition in the stellar profiles of dwarfs lying beyond the Milky
Way at a radius of $simeq 1.0~{rm kpc}$, corresponding to a boson mass of
$simeq 1.1^{+0.2}_{-0.1}times 10^{-22}{rm eV}$, assuming stars trace the
mass. Clear transitions are also evident for most classical dwarfs that orbit
the Milky Way, with pronounced amplitudes indicating significant tidal
stripping as anticipated in $psi$DM simulations of orbiting dwarfs (Schive,
Chieuh & Broadhurst 2020), where the halo is more easily stripped than the
stable soliton core. We conclude that $psi$DM accounts well for the observed
family of classical dwarf profiles with tidal stripping included, in contrast
to heavy particle, cold dark matter, CDM, where low mass galaxies should be
concentrated and core-less, quite unlike the extensive core-halo structure
observed.
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