Issue |
A&A
Volume 386, Number 3, May II 2002
|
|
---|---|---|
Page(s) | 775 - 783 | |
Section | Astrophysical processes | |
DOI | https://doi.org/10.1051/0004-6361:20020271 | |
Published online | 15 May 2002 |
Abundance and evolution of galaxy clusters in cosmological models with massive neutrino
1
Astro Space Center of P.N. Lebedev Physical Institute, Moscow, Russia
2
Center for Plasma Astrophysics, Abastumani Astrophysical Observatory, Tbilisi, Georgia
3
Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, USA
Corresponding author: N. A. Arhipova, arna@lukash.asc.rssi.ru
Received:
3
August
2001
Accepted:
11
January
2002
The time evolution of the number density of galaxy clusters
and their mass and temperature functions are used to constrain
cosmological parameters in the spatially flat dark matter models
containing hot particles (massive neutrino) as well as cold and
baryonic matter.
We test the modified MDM () models with cosmic gravitational
waves and show that they neither pass the cluster evolution
test nor reproduce the observed height of the first acoustic
peak in
spectrum, and therefore should be ruled out.
The models with a non-zero cosmological constant are in better agreement
with observations. We estimate the free cosmological parameters in
ΛMDM with a negligible abundance of gravitational waves,
and find that within the parameter ranges
,
,
,
(i) the value of
is strongly affected by a small
fraction of hot dark matter:
(
CL), and
(ii) the redshift evolution of galaxy clusters alone
reveals the following explicit relation between
and
:
This degeneracy is also expected in LSS tests (with a smaller error).
The present accuracy of observational data allows to bound
the fraction of hot matter,
; the number of massive
neutrino species remains undelimited,
.
Key words: cosmology: observations / cosmology: theory / large–scale structure of the Universe / of
© ESO, 2002
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