Mass calibration of the CODEX cluster sample using SPIDERS spectroscopy – I. The richness–mass relation

Journal Article · Sat Mar 30 00:00:00 EDT 2019 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stz931· OSTI ID:1507231

Capasso, R.  ^[1]; Mohr, J. J. ^[2]; Saro, A. ^[3]; Biviano, A. ^[4]; Clerc, N. ^[5]; Finoguenov, A. ^[6]; Grandis, S. ^[1]; Collins, C. ^[7]; Erfanianfar, G. ^[8]; Damsted, S. ^[9]; Kirkpatrick, C. ^[9]; Kukkola, A. ^[9]

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1. Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich, Germany, Excellence Cluster Universe, Boltzmannstr. 2, D-85748 Garching, Germany
2. Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich, Germany, Excellence Cluster Universe, Boltzmannstr. 2, D-85748 Garching, Germany, Max Planck Institute for Extraterrestrial Physics, Giessenbachstr., D-85748 Garching, Germany
3. Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich, Germany, Excellence Cluster Universe, Boltzmannstr. 2, D-85748 Garching, Germany, INAF – Osservatorio Astronomico di Trieste via G.B. Tiepolo 11, I-34143 Trieste, Italy
4. INAF – Osservatorio Astronomico di Trieste via G.B. Tiepolo 11, I-34143 Trieste, Italy
5. Max Planck Institute for Extraterrestrial Physics, Giessenbachstr., D-85748 Garching, Germany, IRAP, Université de Toulouse, CNRS, UPS, CNES, Toulouse, France
6. Max Planck Institute for Extraterrestrial Physics, Giessenbachstr., D-85748 Garching, Germany, Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2a, FI-00014 Helsinki, Finland
7. Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK
8. Max Planck Institute for Extraterrestrial Physics, Giessenbachstr., D-85748 Garching, Germany
9. Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2a, FI-00014 Helsinki, Finland

Abstract We use galaxy dynamical information to calibrate the richness–mass scaling relation of a sample of 428 galaxy clusters that are members of the CODEX sample with redshifts up to z ∼ 0.7. These clusters were X-ray selected using the ROSAT All-Sky Survey (RASS) and then cross-matched to associated systems in the redMaPPer (the red sequence Matched-filter Probabilistic Percolation) catalogue from the Sloan Digital Sky Survey. The spectroscopic sample we analyse was obtained in the SPIDERS program and contains ∼7800 red member galaxies. Adopting NFW mass and galaxy density profiles and a broad range of orbital anisotropy profiles, we use the Jeans equation to calculate halo masses. Modelling the scaling relation as $$\lambda \propto \text{A}_{\lambda } {M_{\text{200c}}}^{\text{B}_{\lambda }} ({1+z})^{\gamma _{\lambda }}$$, we find the parameter constraints $$\text{A}_{\lambda }=38.6^{+3.1}_{-4.1}\pm 3.9$$, $$\text{B}_{\lambda }=0.99^{+0.06}_{-0.07}\pm 0.04$$, and $$\gamma _{\lambda }=-1.13^{+0.32}_{-0.34}\pm 0.49$$, where we present systematic uncertainties as a second component. We find good agreement with previously published mass trends with the exception of those from stacked weak lensing analyses. We note that although the lensing analyses failed to account for the Eddington bias, this is not enough to explain the differences. We suggest that differences in the levels of contamination between pure redMaPPer and RASS + redMaPPer samples could well contribute to these differences. The redshift trend we measure is more negative than but statistically consistent with previous results. We suggest that our measured redshift trend reflects a change in the cluster galaxy red sequence (RS) fraction with redshift, noting that the trend we measure is consistent with but somewhat stronger than an independently measured redshift trend in the RS fraction. We also examine the impact of a plausible model of correlated scatter in X-ray luminosity and optical richness, showing it has negligible impact on our results.

• Sponsoring Organization: USDOE
• OSTI ID: 1507231
• Journal Information: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 486 Journal Issue: 2; ISSN 0035-8711
• Publisher: Oxford University Press
• Country of Publication: United Kingdom
• Language: English