LoCuSS: The Near-Infrared Luminosity and Weak-Lensing Mass Scaling Relation of Galaxy Clusters

Abstract

We present the first scaling relation between weak-lensing galaxy cluster mass, $M_{WL}$, and near-infrared luminosity, $L_K$. Our results are based on 17 clusters observed with wide-field instruments on Subaru, the United Kingdom Infrared Telescope, the Mayall Telescope, and the MMT. We concentrate on the relation between projected 2D weak-lensing mass and spectroscopically confirmed luminosity within 1Mpc, modelled as $M_{WL}\propto L_K^b$, obtaining a power law slope of $b=0.83_{-0.24}^{+0.27}$ and an intrinsic scatter of ${\sigma }_{ln{M}_{WL}|L_K}=10_{-5}^{+8}\%$. Intrinsic scatter of ~10% is a consistent feature of our results regardless of how we modify our approach to measuring the relationship between mass and light. For example, deprojecting the mass and measuring both quantities within $r_{500}$, that is itself obtained from the lensing analysis, yields ${\sigma }_{ln{M}_{WL}|L_K}=10_{-5}^{+7}\%$ and $b=0.97_{-0.17}^{+0.17}$. We also find that selecting members based on their (J-K) colours instead of spectroscopic redshifts neither increases the scatter nor modifies the slope. Overall our results indicate that near-infrared luminosity measured on scales comparable with $r_{500}$ (typically 1Mpc for our sample) is a low scatter and relatively inexpensive proxy for weak-lensing mass. Near-infrared luminosity may therefore be a useful mass proxy for cluster cosmology experiments.

9 Pages, 5 Figures, 3 Tables. Submitted to MNRAS

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• A derivation of masses and total luminosities of galaxy groups and clusters in the maxBCG catalogue