Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-05
Astrophys.J.650:L1-L4,2006
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, ApJ Letters in press
Scientific paper
10.1086/508660
We study the relation between the rms mass fluctuations on 8$h^{-1}$Mpc scales and $\Omega_{\rm m}$ using the recent clustering results of XMM-{\it Newton} soft (0.5-2 keV) X-ray sources, which have a median redshift of $z\sim 1.2$. The relation can be represented in the form $\sigma_{8}=0.34 (\pm 0.01) \Omega_{\rm m}^{-\gamma}$ where $\gamma\equiv \gamma(\Omega_{\rm m},w)$ and it is valid for all $w<-1/3$ models. By combining the X-ray clustering and SNIa data we find that the model which best reproduces the observational data is that with: $\Omega_{\rm m}\simeq 0.26$, $w\simeq -0.90$ and $\sigma_{8}\simeq 0.73$, which is in excellent agreement with the recent 3-year Wilkinson Microwave Anisotropy Probe results.
Basilakos Spyros
Plionis Manolis
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