The XXL Survey: XXV. Cosmological analysis of the C1 cluster number counts
Review article, 2018
Context. We present an estimation of cosmological parameters with clusters of galaxies. Aims. We constrain the Ωm, σ8, and w parameters from a stand-alone sample of X-ray clusters detected in the 50 deg2 XMM-XXL survey with a well-defined selection function. Methods. We analyse the redshift distribution of a sample comprising 178 high signal-to-noise ratio clusters out to a redshift of unity. The cluster sample scaling relations are determined in a self-consistent manner. Results. In a lambda cold dark matter (ΛCDM) model, the cosmology favoured by the XXL clusters compares well with results derived from the Planck Sunyaev-Zel'dovich clusters for a totally different sample (mass/redshift range, selection biases, and scaling relations). However, with this preliminary sample and current mass calibration uncertainty, we find no inconsistency with the Planck CMB cosmology. If we relax the w parameter, the Planck CMB uncertainties increase by a factor of ~10 and become comparable with those from XXL clusters. Combining the two probes allows us to put constraints on Ωm = 0.316 ± 0.060, σ8 = 0.814 ± 0.054, and w = -1.02 ± 0.20. Conclusions. This first self-consistent cosmological analysis of a sample of serendipitous XMM clusters already provides interesting insights into the constraining power of the XXL survey. Subsequent analysis will use a larger sample extending to lower confidence detections and include additional observable information, potentially improving posterior uncertainties by roughly a factor of 3.
Cosmological parameters
Surveys
X-rays: galaxies: clusters
Galaxies: clusters: intracluster medium
Large-scale structure of Universe
Author
F. Pacaud
University of Bonn
M. Pierre
University Paris-Saclay
J. B. Melin
University Paris-Saclay
C. Adami
Laboratoire d'Astrophysique de Marseille
A. E. Evrard
University of Michigan
S. Galli
Institut d 'Astrophysique de Paris
F. Gastaldello
Istituto nazionale di astrofisica (INAF)
B. Maughan
University of Bristol
M. Sereno
University of Bologna
Istituto nazionale di astrofisica (INAF)
S. Alis
Istanbul University
B. Altiéri
European Space Astronomy Centre (ESAC)
M. Birkinshaw
University of Bristol
L. Chiappetti
Istituto nazionale di astrofisica (INAF)
L. Faccioli
University Paris-Saclay
P. Giles
University of Bristol
Cathy Horellou
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
A. Iovino
Istituto nazionale di astrofisica (INAF)
E. Koulouridis
University Paris-Saclay
J. P. Le Fevre
Institut de Recherche sur les Lois Fondamentales de l'Univers
C. Lidman
Australian National University
M. Lieu
European Space Astronomy Centre (ESAC)
S. Maurogordato
Université Nice Sophia Antipolis (UNS)
L. Moscardini
Istituto nazionale di astrofisica (INAF)
National Institute for Nuclear Physics
University of Bologna
M. Plionis
Aristotle University of Thessaloniki
National Observatory of Athens
B. M. Poggianti
Istituto nazionale di astrofisica (INAF)
E. Pompei
European Southern Observatory Santiago
T. Sadibekova
University Paris-Saclay
I. Valtchanov
European Space Astronomy Centre (ESAC)
J. Willis
University of Victoria
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 620 A10Subject Categories
Analytical Chemistry
Astronomy, Astrophysics and Cosmology
Probability Theory and Statistics
DOI
10.1051/0004-6361/201834022