Abstract
The density profiles of dwarf galaxies are a highly varied set. If the dark
matter is an Ultra-light particle such as axions, then simulations predict a
distinctive and unique profile. If the axion mass is large enough to fit the
ultra-faint dwarf (UFD) satellites($m10^-21$ eV), then the models
do not fit the density profile of Fornax and Sculptor and are ruled out by more
than $3-\sigma$ confidence. If the axion mass is in the mass range that can fit
mass profiles of Fornax and Sculptor dwarf spheroidals, then its extended
profile implies enormous masses ($\approx10^11-10^12M_ødot$) for the
UFDs. These large masses for the UFDS are ruled out by more than $3-\sigma$
confidence by dynamical friction arguments. The tension would increase further
considering star formation histories and stellar masses of the UFDs. Moreover,
light mass axions are inconsistent with the sub-halo mass function in the Milky
Way.
Users
Please
log in to take part in the discussion (add own reviews or comments).