학술논문
AMICO galaxy clusters in KiDS-DR3: Measurement of the halo bias and power spectrum normalization from a stacked weak lensing analysis
Document Type
Working Paper
Author
Ingoglia, Lorenzo; Covone, Giovanni; Sereno, Mauro; Giocoli, Carlo; Bardelli, Sandro; Bellagamba, Fabio; Castignani, Gianluca; Farrens, Samuel; Hildebrandt, Hendrik; Joudaki, Shahab; Jullo, Eric; Lanzieri, Denise; Lesci, Giorgio F.; Marulli, Federico; Maturi, Matteo; Moscardini, Lauro; Nanni, Lorenza; Puddu, Emanuela; Radovich, Mario; Roncarelli, Mauro; Sapio, Feliciana; Schimd, Carlo
Source
Subject
Language
Abstract
Galaxy clusters are biased tracers of the underlying matter density field. At very large radii beyond about 10 Mpc/\textit{h}, the shear profile shows evidence of a second-halo term. This is related to the correlated matter distribution around galaxy clusters and proportional to the so-called halo bias. We present an observational analysis of the halo bias-mass relation based on the AMICO galaxy cluster catalog, comprising around 7000 candidates detected in the third release of the KiDS survey. We split the cluster sample into 14 redshift-richness bins and derive the halo bias and the virial mass in each bin by means of a stacked weak lensing analysis. The observed halo bias-mass relation and the theoretical predictions based on the $\Lambda$CDM standard cosmological model show an agreement within $2\sigma$. The mean measurements of bias and mass over the full catalog give $M_{200c} = (4.9 \pm 0.3) \times 10^{13} M_{\odot}/\textit{h}$ and $b_h \sigma_8^2 = 1.2 \pm 0.1$. With the additional prior of a bias-mass relation from numerical simulations, we constrain the normalization of the power spectrum with a fixed matter density $\Omega_m = 0.3$, finding $\sigma_8 = 0.63 \pm 0.10$.