Neutrino dark matter in clusters of galaxies

Details Neutrino dark matter in clusters of galaxies Neutrino dark matter in clusters of galaxies

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000njph....2...11t&link_type=abstract

New Journal of Physics, Volume 2, Issue 1, pp. 11 (2000).

Physics

4

Scientific paper

We present a model calculation for the radial matter density and mass distribution in two clusters of galaxies (Coma and A119) including cold dark matter, massive though light (simeq2 eV) neutrino dark matter and collisional intra-cluster gas which emits x-ray radiation. The calculation uses an extension of the Lynden-Bell statistics to the choice of constant masses instead of constant volume. This allows proper inclusion of mixtures of particles of various masses in the gravitational interaction. When it is applied to the matter in the galaxy cluster the radial ROSAT x-ray luminosity profiles can be nicely accounted for. The result is that the statistics identifies the neutrino dark matter in the cluster centre as being degenerate in the sense of Lynden-Bell's spatial degeneracy. This implies that it is distributed in a way different from the classical assumption. The best fits are obtained for the simeq2 eV neutrinos. The fraction of these and their spatial distribution are of interest for understanding cluster dynamics and may have cosmological implications.

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