Open AccessCosmological constraints from X‐ray AGN clustering and Type Ia supernova data
Author(s) -
Basilakos S.,
Plionis M.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society: letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.067
H-Index - 122
eISSN - 1745-3933
pISSN - 1745-3925
DOI - 10.1111/j.1745-3933.2005.00041.x
Subject(s) - physics , astrophysics , supernova , redshift , cosmological constant , cold dark matter , dark matter , dark energy , cosmology , cluster analysis , astronomy , universe , type (biology) , galaxy , mathematical physics , statistics , ecology , mathematics , biology
We put constraints on the main cosmological parameters of different spatially flat cosmological models by combining the recent clustering results of XMM–Newton soft (0.5–2 keV) X‐ray sources, which have a redshift distribution with median redshift z ∼ 1.2 , and Type Ia supernova data. Using a likelihood procedure we find that the model that best reproduces the observational data and which is consistent with stellar ages is the concordance Λ cold dark matter model with Ω m ≃ 0.28, w ≃−1, H 0 ≃ 72 km s ‐1 Mpc −1 and t 0 ≃ 13.5 Gyr , and has an X‐ray active galactic nucleus clustering evolution which is constant in physical coordinates. For a different clustering evolution model (constant in comoving coordinates) we find another viable model, although less probable because of the smaller age of the universe, with Ω m ≃ 0.38, w ≃−1.25, H 0 ≃ 70 km s −1 Mpc −1 and t 0 ≃ 12.9 Gyr .