利用高Z X射线AGN的聚类打破σ_8-Omega_m简并
Breaking the sigma_8-Omega_m degeneracy using the clustering of high-z X-ray AGN
摘要：
X射线选择活动星系核的成团似乎是提取宇宙学信息的一个有价值的工具。利用~30000 XMM-Newton软件最近的高精度角聚类结果，（0.5-2 keV）X射线源（Ebrero et al. 2009），其中值红移为$z\sim 1$，并假设一个平坦的几何形状，活动星系核集群演化的共动坐标常数和Basilakos et al.（2008）的活动星系核偏差演化模型，我们设法打破了Omega_m-sigma_8简并性。由此产生的宇宙学约束是：Omega_m=0.27（+0.03 -0.05），w=-0.90（+0.10 -0.16）和sigma_8=0.74（+0.14 -0.12），而暗物质宿主晕质量，其中X射线选择AGN被假定居住，M=2.50（+0.50 -1.50）× 10^13 h^{-1} M（太阳能）。对于常数λ模型（w=-1），我们发现Omega_m=0.24（+-0.06）和sigma_8=0.83（+0.11 -0.16），这与最近基于团丰度、弱透镜和CMB的研究结果一致，但与最近的体流分析结果不一致。
英文摘要：
The clustering of X-ray selected AGN appears to be a valuable tool for extracting cosmological information. Using the recent high-precision angular clustering results of ~30000 XMM-Newton soft (0.5-2 keV) X-ray sources (Ebrero et al. 2009), which have a median redshift of $z\sim 1$, and assuming a flat geometry, a constant in comoving coordinates AGN clustering evolution and the AGN bias evolution model of Basilakos et al. (2008), we manage to break the Omega_m-sigma_8 degeneracy. The resulting cosmological constraints are: Omega_m=0.27 (+0.03 -0.05), w=-0.90 (+0.10 -0.16) and sigma_8=0.74 (+0.14 -0.12), while the dark matter host halo mass, in which the X-ray selected AGN are presumed to reside, is M=2.50 (+0.50 -1.50) X 10^13 h^{-1} M(solar). For the constant Lambda model (w=-1) we find Omega_m=0.24 (+- 0.06) and sigma_8=0.83 (+0.11 -0.16), in good agreement with recent studies based on cluster abundances, weak lensing and the CMB, but in disagreement with the recent bulk flow analysis.
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