Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-04-21
Mon.Not.Roy.Astron.Soc.314:647-656,2000
Astronomy and Astrophysics
Astrophysics
11 pages, Latex using MN style, 4 figures enclosed. Version accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2000.03372.x
We analyse the spatial clustering properties of the RASS1 Bright Sample, an X-ray flux-limited catalogue of galaxy clusters selected from the southern part of the $ROSAT$ All-Sky Survey. The two-point correlation function $\xi(r)$ of the whole sample is well fitted (in an Einstein-de Sitter model) by the power-law $\xi=(r/r_0)^{-\gamma}$, with $r_0= 21.5^{+3.4}_{-4.4} h^{-1}$ Mpc and $\gamma=2.11^{+0.53}_{-0.56}$ (95.4 per cent confidence level with one fitting parameter). We use the RASS1 Bright Sample as a first application of a theoretical model which aims at predicting the clustering properties of X-ray clusters in flux-limited surveys for different cosmological scenarios. The model uses the theoretical and empirical relations between mass, temperature and X-ray cluster luminosity, and fully accounts for the redshift evolution of the underlying dark matter clustering and cluster bias factor. The comparison between observational results and theoretical predictions shows that the Einstein-de Sitter models display too low a correlation length, while models with a matter density parameter $\Omega_{\rm 0m}=0.3$ (with or without a cosmological constant) are successful in reproducing the observed clustering. The dependence of the correlation length $r_0$ on the X-ray limiting flux and luminosity of the sample is generally consistent with the predictions of all our models. Quantitative agreement is however only reached for $\Omega_{\rm 0m} = 0.3$ models. The model presented here can be reliably applied to future deeper X-ray cluster surveys: the study of their clustering properties will provide a useful complementary tool to the traditional cluster abundance analyses to constrain the cosmological parameters.
de Grandi Sabrina
Lucchin Francesco
Matarrese Sabino
Moscardini Lauro
No associations
LandOfFree
The correlation function of X-ray galaxy clusters in the RASS1 Bright Sample 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 correlation function of X-ray galaxy clusters in the RASS1 Bright Sample, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The correlation function of X-ray galaxy clusters in the RASS1 Bright Sample will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-70272