AMICO galaxy clusters in KiDS-DR3: weak-lensing mass calibration

Abstract

We present the mass calibration for galaxy clusters detected with the AMICO code in KiDS DR3 data. The cluster sample comprises $\sim$ 7000 objects and covers the redshift range 0.1 < $z$ < 0.6. We perform a weak lensing stacked analysis by binning the clusters according to redshift and two different mass proxies provided by AMICO, namely the amplitude $A$ (measure of galaxy abundance through an optimal filter) and the richness ${\lambda }^{\ast }$ (sum of membership probabilities in a consistent radial and magnitude range across redshift). For each bin, we model the data as a truncated NFW profile plus a 2-halo term, taking into account uncertainties related to concentration and miscentring. From the retrieved estimates of the mean halo masses, we construct the $A$-$M_{200}$ and the ${\lambda }^{\ast }$-$M_{200}$ relations. The relations extend over more than one order of magnitude in mass, down to $M_{200}\sim 2(5)\times 10^{13}{M}_{\odot }/h$ at $z$ = 0.2 (0.5), with small evolution in redshift. The logarithmic slope is $\sim 2.0$ for the $A$-mass relation, and $\sim 1.7$ for the ${\lambda }^{\ast }$-mass relation, consistent with previous estimations on mock catalogues and coherent with the different nature of the two observables.

19 pages, 16 figures, accepted by MNRAS

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