Volume 620, December 2018
The XXL Survey: second series
|Number of page(s)||11|
|Section||Cosmology (including clusters of galaxies)|
|Published online||20 November 2018|
The XXL Survey
XXV. Cosmological analysis of the C1 cluster number counts★
Argelander-Institut für Astronomie, University of Bonn,
Auf dem Hügel 71,
2 AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gif-sur-Yvette, France
3 Aix Marseille Univ., CNRS, CNES, LAM, Marseille, France
4 Department of Physics and Michigan Center for Theoretical Physics, University of Michigan, Ann Arbor, MI 48109, USA
5 Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA
6 Institut d’Astrophysique de Paris (UMR7095: CNRS & UPMC-Sorbonne Universities), 75014, Paris, France
7 INAF–IASF Milano, Via Bassini 15, 20133 Milano, Italy
8 HH Wills Physics Laboratory, Tyndall Avenue, Bristol, BS8 1TL, UK
9 INAF-OAS Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Gobetti 93/3, 40129, Bologna, Italy
10 Dipartimento di Fisica e Astronomia, Alma Mater Studiorum Università di Bologna, Via Gobetti 93/2, 40129 Bologna, Italy
11 Department of Astronomy and Space Sciences, Faculty of Science, 41 Istanbul University, 34119 Istanbul, Turkey
12 European Space Astronomy Centre (ESA/ESAC), Operations Department, Villanueva de la Canãda, Madrid, Spain
13 Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, 439 92 Onsala, Sweden
14 INAF–Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Via E. Bianchi 46, 20121 Merate, Italy
15 CEA Saclay, DRF/Irfu/DEDIP/LILAS, 91191 Gif-sur-Yvette Cedex, France
16 Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
17 Laboratoire Lagrange, UMR 7293, Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d’Azur, 06304 Nice, France
18 INFN–Sezione di Bologna, viale Berti Pichat 6/2, 40127, Bologna, Italy
19 INAF–Osservatorio astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy
20 European Southern Observatory, Alonso de Cordova 3107, Vitacura, 19001 Casilla, Santiago 19, Chile
21 Department of Physics and Astronomy, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 1A1, Canada
22 National Observatory of Athens, Lofos Nymfon, 11810 Athens, Greece
23 Physics Department of Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
Accepted: 11 September 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.
Key words: surveys / X-rays: galaxies: clusters / galaxies: clusters: intracluster medium / large-scale structure of Universe / cosmological parameters
© ESO 2018
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