AMICO galaxy clusters in KiDS-DR3: weak lensing mass calibration. Issue 2 (16th January 2019)

• Record Type: Journal Article
• Authors: Bellagamba, Fabio; Sereno, Mauro; Roncarelli, Mauro; Maturi, Matteo; Radovich, Mario; Bardelli, Sandro; Puddu, Emanuella; Moscardini, Lauro; Getman, Fedor; Hildebrandt, Hendrik; Napolitano, Nicola
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 484:Issue 2(2019)
• Page Start: 1598
• Page End: 1615
• Publication Date: 2019-01-16
• Subjects: gravitational lensing: weak -- galaxies: clusters: general -- cosmology: observations -- large-scale structure of Universe; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz090
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: We present the mass calibration for galaxy clusters detected with the AMICO code in KiDS DR3 data. The cluster sample comprises 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 λ* (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 two-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 λ*– M 200 relations. The relations extend over more than 1 order of magnitude in mass, down to$M_{200} \sim 2\, (5) \times 10^{13} \, \mathrm{M}_\odot \, h^{-1}$ at$z$ = 0.2 (0.5), with small evolution in redshift. The logarithmic slope is 2.0 for the A –mass relation, and 1.7 for the λ*–mass relation, consistent with previous estimations on mock catalogues and coherent with the different nature of the two observables.