1 research outputs found
Do non-relativistic neutrinos constitute the dark matter?
The dark matter of the Abell 1689 galaxy cluster is modeled by thermal,
non-relativistic gravitating fermions and its galaxies and X-ray gas by
isothermal distributions. A fit yields a mass of 1.445 eV. A dark matter fraction
occurs for degrees
of freedom, i. e., for 3 families of left plus right handed neutrinos with
masses . Given a temperature of 0.045 K and a de
Broglie length of 0.20 mm, they establish a quantum structure of several
million light years across, the largest known in the Universe. The virial
-particle temperature of keV coincides with the
average one of X-rays. The results are compatible with neutrino genesis,
nucleosynthesis and free streaming. The neutrinos condense on the cluster at
redshift , thereby causing reionization of the intracluster gas
without assistance of heavy stars. The baryons are poor tracers of the dark
matter density.Comment: Extended published version, 6.1 pages, 2 figure