Can 'warm' particles provide the missing mass in dwarf galaxies?
Abstract
Particles which decouple before quark confinement in a hot big bang will have a number density significantly below that of relic neutrinos. Fermions whose mass exceeds about 500 eV may cluster in dwarf galaxies without violating phase space constraints; however, the free-streaming mass scale for such particles is much larger than a dwarf galaxy mass. Results from a numerical simulation show that this free streaming does not mean such particles cannot provide the missing mass in dwarf galaxies, so long as such dwarf galaxy halos constitute a small fraction of the dark matter in the universe. It is shown that the results of the simulation are not affected by two-body scattering.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1985
- DOI:
- 10.1086/163583
- Bibcode:
- 1985ApJ...298....1M
- Keywords:
-
- Big Bang Cosmology;
- Dwarf Galaxies;
- Missing Mass (Astrophysics);
- Neutrinos;
- Galactic Evolution;
- Mathematical Models;
- Power Spectra;
- Astrophysics