The XXL Survey X: K-band luminosity - weak-lensing mass relation for groups and clusters of galaxies

Abstract

We present the K-band luminosity-halo mass relation, $L_{K,500}-M_{500,WL}$, for a subsample of 20 of the 100 brightest clusters in the XXL Survey observed with WIRCam at the Canada-France-Hawaii Telescope (CFHT). For the first time, we have measured this relation via weak-lensing analysis down to $M_{500,WL}=3.5\times 10^{13}{M}_{\odot }$. This allows us to investigate whether the slope of the $L_K-M$ relation is different for groups and clusters, as seen in other works. The clusters in our sample span a wide range in mass, $M_{500,WL}=0.35-12.10\times 10^{14}{M}_{\odot }$, at $0<z<0.6$. The K-band luminosity scales as ${\log }_{10}(L_{K,500}/10^{12}{L}_{\odot })\propto \beta lo{g}_{10}(M_{500,WL}/10^{14}{M}_{\odot })$ with $\beta =0.85_{-0.27}^{+0.35}$ and an intrinsic scatter of ${\sigma }_{ln{L}_K|M}=0.37_{-0.17}^{+0.19}$. Combining our sample with some clusters in the Local Cluster Substructure Survey (LoCuSS) present in the literature, we obtain a slope of $1.05_{-0.14}^{+0.16}$ and an intrinsic scatter of $0.14_{-0.07}^{+0.09}$. The flattening in the $L_K-M$ seen in previous works is not seen here and might be a result of a bias in the mass measurement due to assumptions on the dynamical state of the systems. We also study the richness-mass relation and find that group-sized halos have more galaxies per unit halo mass than massive clusters. However, the brightest cluster galaxy (BCG) in low-mass systems contributes a greater fraction to the total cluster light than BCGs do in massive clusters; the luminosity gap between the two brightest galaxies is more prominent for group-sized halos. This result is a natural outcome of the hierarchical growth of structures, where massive galaxies form and gain mass within low-mass groups and are ultimately accreted into more massive clusters to become either part of the BCG or one of the brighter galaxies. [Abridged]

A&A, in press

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• The XXL survey XV: Evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters
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