Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-04-20
Astrophys.J. 506 (1998) 45
Astronomy and Astrophysics
Astrophysics
8 pages, 4 eps figures, accepted by ApJ, minor changes
Scientific paper
10.1086/306252
We present a new determination of the mass function of galaxy clusters, based on optical virial mass estimates for a large sample of 152 nearby (z\le0.15) Abell-ACO clusters, as provided by Girardi et al. (1998). This sample includes both data from the literature and the new ENACS data. The resulting mass function is reliably estimated for masses larger than M_{lim}\simeq 4\times 10^{14} \msun, while it is affected by sample incompleteness at smaller masses. We find N(>M_{lim})=(6.3\pm 1.2) 10^{-6} (h^{-1} Mpc)^{-3} for cluster masses estimated within a 1.5 h^{-1} radius. Our mass function is intermediate between the two previous estimates by Bahcall & Cen (1993) and by Biviano et al. (1993). Based on the Press-Schechter approach, we use this mass function to constrain the amplitude of the fluctuation power spectrum at the cluster scale. After suitably convolving the PS predictions with observational errors on cluster masses and COBE-normalizing the fluctuation power spectrum, we find sigma_8=(0.60\pm 0.04) Omega_0^{-0.46+0.09 Omega_0} for flat low-density models and sigma_8=(0.60\pm 0.04) Omega_0^{-0.48+0.17 Omega_0} for open models (at the 90% c.l.).
;
Borgani Stefano
Girardi Maria
Giuricin Giuliano
Mardirossian Fabio
No associations
LandOfFree
The Observational Mass Function of Nearby Galaxy Clusters 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 The Observational Mass Function of Nearby Galaxy Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Observational Mass Function of Nearby Galaxy Clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-515632