Título
Breaking the σ₈–Ωₘ degeneracy using the clustering of HIGH-𝓏
x-ray active galactic nuclei
Autor
Manolis Plionis
Nivel de Acceso
Acceso Abierto
Materias
Resumen o descripción
The clustering of X-ray selected active galactic nuclei (AGNs) appears to be a valuable tool for extracting cosmological information. Using the recent high-precision angular clustering results of ∼30,000 XMM-Newton soft (0.5–2 keV) X-ray sources, which have a median redshift of 𝓏 ∼ 1, and assuming a flat geometry, a constant in comoving coordinates AGN clustering evolution, and the AGN bias evolution model of Basilakos et al., we manage to break the σ₈–Ωₘ degeneracy. The resulting cosmological constraints are Ωₘ = 0.27⁺⁰˙⁰³₋₀.₀₅, w = −0.90⁺⁰˙¹⁰₋₀.₁₆, and σ₈ = 0.74⁺⁰˙¹⁴₋₀.₁₂, while the dark matter host halo mass, in which the X-ray selected AGNs are presumed to reside, is M = 2.50⁺⁰˙⁵⁰₋₁.₅₀,×10¹³ h⁻¹M⊙ . For the constant Λ model (w = −1) we find Ωₘ = 0.24±0.06 and σ₈= 0.83⁺⁰˙¹¹₋₀.₁₆, in good agreement with recent studies based on cluster abundances, weak lensing, and the cosmic microwave background, but in disagreement with the recent bulk flow analysis.
Editor
The Astrophysical Journal Letters
Fecha de publicación
10 de mayo de 2010
Tipo de publicación
Artículo
Versión de la publicación
Versión aceptada
Recurso de información
Formato
application/pdf
Idioma
Inglés
Relación
x-ray active galactic nuclei, The Astrophysical Journal Letters, Vol.714(2):L185–L189
Audiencia
Estudiantes
Investigadores
Público en general
Sugerencia de citación
Basilakos, Spyros and Plionis, Manolis, (2010), Breaking the σ₈–Ωₘ degeneracy using the clustering of HIGH-𝓏
Repositorio Orígen
Repositorio Institucional del INAOE
Descargas
371