Detection of a universal core-halo transition in dwarf galaxies as
  predicted by Bose-Einstein dark matter
  The presence of large dark matter cores in dwarf galaxies has long been
puzzling and many are now known to be surrounded by an extensive halo of stars.
Distinctive core-halo structure is characteristic of dark matter as a Bose
Einstein condensate, $\psi$DM, with a dense, soliton core predicted in every
galaxy, representing the ground state, surrounded by a large, tenuous halo of
excited density waves. A marked density transition is predicted between the
core and the halo set by the de Broglie wavelength, as the soliton core is a
prominent standing wave that is denser by over an order of magnitude than the
surrounding halo. Here we identify this predicted behavior in the stellar
profiles of the well known "isolated" dwarfs that lie outside the Milky Way,
each with a clear density transition at $\simeq 1.0~{\rm kpc}$, implying a very
light boson, $m_{\psi} \simeq 10^{-22}$eV. The classical dwarf galaxies
orbiting within the Milky Way also show this predicted core-halo structure but
with larger density transitions of over two orders of magnitude, that we show
implies tidal stripping of dwarf galaxies by the Milky way, as the tenuous halo
is more easily stripped than the stable soliton core. We conclude that dark
matter as a light boson explains the observed family of classical dwarf
profiles with tidal stripping included, in contrast to the standard heavy
particle interpretation where low mass galaxies should be concentrated and
core-less, quite unlike the core-halo structure observed.
