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Decaying neutrinos in galaxy clustersDavidsen et al. (1991) have argued that the failure to detect UV photons from the dark matter (DM) in cluster A665 excludes the decaying neutrino hypothesis. Sciama et al. (1993) argued that because of high central concentration the DM in that cluster must be baryonic. We study the DM profile in clusters of galaxies simulated using the Harrison-Zel'dovich spectrum of density fluctuations, and an amplitude previously derived from numerical simulations (Melott 1984b; Anninos et al. 1991) and in agreement with microwave background fluctuations (Smoot et al. 1992). We find that with this amplitude normalization cluster neutrino DM densities are comparable to observed cluster DM values. We conclude that given this normalization, the cluster DM should be at least largely composed of neutrinos. The constraint of Davidsen et al. can be somewhat weakened by the presence of baryonic DM; but it cannot be eliminated given our assumptions.
Document ID
19950035661
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Melott, Adrian L.
(University of Kansas, Lawrence, KS United States)
Splinter, Randall J.
(University of Kansas, Lawrence, KS United States)
Persic, Massimo
(SISSA Trieste, Italy)
Salucci, Paolo
(SISSA Trieste, Italy)
Date Acquired
August 16, 2013
Publication Date
January 20, 1994
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 421
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A67260
Funding Number(s)
CONTRACT_GRANT: NSF OSR-92-55223
CONTRACT_GRANT: NAGW-2923
CONTRACT_GRANT: NSF AST-90-21414
Distribution Limits
Public
Copyright
Other

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