Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-18
Astron.Astrophys. 386 (2002) 775-783
Astronomy and Astrophysics
Astrophysics
9 pages, 7 figures, submitted in A&A
Scientific paper
10.1051/0004-6361:20020271
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 a fraction of hot particles (massive neutrino) additional to 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 $\Delta T/T$ 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 $\Lambda$MDM with a negligible abundance of gravitational waves, and find that within the parameter ranges $h\in (0.6, 0.7)$, $n\in (0.9, 1.1)$, (i) the value of $\Omega_\Lambda$ is strongly affected by a small fraction of hot dark matter, $f_\nu\equiv\Omega_\nu /\Omega_m\in (0, 0.2)$: $0.45 <\Omega_\Lambda <0.7$ ($1\sigma$ CL), and (ii) the redshift evolution of galaxy clusters alone reveals the following explicit correlation between $\Omega_\Lambda$ and $f_\nu$: $\Omega_\Lambda +0.5f_\nu =0.65\pm 0.1$. The present accuracy of observational data allows only to bound the fraction of hot matter, $f_\nu\in (0, 0.2)$ (the number of massive neutrino species remains undelimited, $N_\nu =1, 2, 3$).
Arhipova Natalia A.
Kahniashvili Tina
Lukash Vladimir N.
No associations
LandOfFree
Abundance and evolution of galaxy clusters in cosmological models with massive neutrino does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Abundance and evolution of galaxy clusters in cosmological models with massive neutrino, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Abundance and evolution of galaxy clusters in cosmological models with massive neutrino will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-283380