Dwarf Spheroidal Galaxies and the Mass of the Neutrino
Abstract
We argue that neutrinos cannot provide the missing mass in Draco and Ursa Minor, since for reasonable neutrino mass (m_v_~30 eV) phase-space limits would then require very large core radii (10 kpc) and masses (~4 x 10^11^ M_sun_) 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1992
- DOI:
- 10.1086/186336
- Bibcode:
- 1992ApJ...389L...9G
- Keywords:
-
- Dwarf Galaxies;
- Galactic Structure;
- Neutrinos;
- Particle Mass;
- Dark Matter;
- Hubble Constant;
- Milky Way Galaxy;
- Missing Mass (Astrophysics);
- Spheroids;
- Astrophysics;
- COSMOLOGY: DARK MATTER;
- GALAXIES: LOCAL GROUP