We argue that neutrinos cannot provide the missing mass in Draco and Ursa Minor, since for reasonable neutrino mass (mν ∼ 30 eV) phase-space limits would then require very large core radii (∼10 kpc) and masses (∼4 × 1011 M⊙) for these dwarfs, which would make their dynamical friction decay times in the Galactic halo significantly shorter than a Hubble time. These limits are insensitive to assumptions about the anisotropy of the neutrino distribution.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
- Dark matter
- Galaxies: local group