CODEX weak lensing: concentration of galaxy clusters at z ~ 0.5

Journal Article · Sat Mar 04 04:00:00 UTC 2017 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stx484 · OSTI ID:1360791

Cibirka, N. ^[1]; Cypriano, E. S. ^[2]; Brimioulle, F. ^[3]; Gruen, D. ^[4]; Erben, T. ^[5]; van Waerbeke, L. ^[6]; Miller, L. ^[7]; Finoguenov, A. ^[8]; Kirkpatrick, C. ^[9]; Henry, J. Patrick ^[10]; Rykoff, E. ^[4]; Rozo, E. ^[11]; Dupke, R. ^[12]; Kneib, J. -P. ^[13]; Shan, H. ^[14]; Spinelli, P. ^[15]

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1. Univ. of Sao Paulo (Brazil). Inst. of Astronomy, Geophysics and Atmospheric Sciences; Ludwig Maximilian Univ., Munich (Germany)
2. Univ. of Sao Paulo (Brazil). Inst. of Astronomy, Geophysics and Atmospheric Sciences
3. Max Planck Inst. fur Extraterrestrische Physik, Garching (Germany); National Observatory, Rio de Janeiro (Brazil); Ludwig Maximilian Univ., Munich (Germany)
4. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics & Cosmology; SLAC National Accelerator Lab., Menlo Park, CA (United States)
5. Argelander-Inst. fur Astronomie, Bonn (Germany)
6. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Physics and Astronomy
7. Univ. of Oxford (United Kingdom). Dept. of Physics
8. Univ. of Helsinki (Finland). Dept. of Physics; Max Planck Inst. fur Extraterrestrische Physik, Garching (Germany)
9. Univ. of Helsinki (Finland). Dept. of Physics; Univ. of Helsinki (Finland). Helsinki Inst. of Physics
10. Inst. for Astronomy, Honolulu, HI (United States)
11. Univ. of Arizona, Tucson, AZ (United States). Dept. of Physics
12. National Observatory, Rio de Janeiro (Brazil); Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Astronomy; Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy; Eureka Scientic Inc., Oakland, CA (United States)
13. Ecole Polytechnique Federale Lausanne (Switzlerland). Lab. d'Astrophysique, Observatoire de Sauverny; Aix-Marseille Univ., and CNRS/IN2P3, Marseille (France). Lab. d'Astrophysique de Marseille
14. Ecole Polytechnique Federale Lausanne (Switzlerland). Lab. d'Astrophysique, Observatoire de Sauverny
15. Museum of Astronomy and Related Sciences (MAST), Rio de Janeiro (Brazil)

Here, we present a stacked weak-lensing analysis of 27 richness selected galaxy clusters at 0.40 ≤ z ≤ 0.62 in the COnstrain Dark Energy with X-ray galaxy clusters (CODEX) survey. The fields were observed in five bands with the Canada–France–Hawaii Telescope (CFHT). We measure the stacked surface mass density profile with a 14σ significance in the radial range 0.1 < RMpch^-1 < 2.5. The profile is well described by the halo model, with the main halo term following a Navarro–Frenk–White profile (NFW) profile and including the off-centring effect. We select the background sample using a conservative colour–magnitude method to reduce the potential systematic errors and contamination by cluster member galaxies. We perform a Bayesian analysis for the stacked profile and constrain the best-fitting NFW parameters M_200c=6.6$$+1.0\atop{-0.8}$$×10¹⁴h^-1 M⊙ and c_200c=3.7$$+0.7\atop{-0.6}$$. The off-centring effect was modelled based on previous observational results found for redMaPPer Sloan Digital Sky Survey clusters. Our constraints on M200c and c200c allow us to investigate the consistency with numerical predictions and select a concentration–mass relation to describe the high richness CODEX sample. Comparing our best-fitting values for M200c and c200c with other observational surveys at different redshifts, we find no evidence for evolution in the concentration–mass relation, though it could be mitigated by particular selection functions. Similar to previous studies investigating the X-ray luminosity–mass relation, our data suggest a lower evolution than expected from self-similarity.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE; National Aeronautic and Space Administration (NASA)
• Grant/Contract Number: AC02-76SF00515
• OSTI ID: 1360791
• Journal Information: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 468; ISSN 0035-8711
• Publisher: Royal Astronomical SocietyCopyright Statement
• Country of Publication: United States
• Language: English