ARCRAIDER I: Detailed optical and X-ray analysis of the cooling flow cluster Z3146

TL;DR

This paper provides a comprehensive optical and X-ray analysis of galaxy cluster Z3146, confirming its relaxed state, measuring its mass, and identifying gravitational arc candidates, contributing to understanding cluster dynamics and lensing effects.

Contribution

It presents a detailed multi-wavelength analysis of Z3146, combining lensing and X-ray data to assess its dynamical state and mass, with new gravitational arc candidates identified.

Findings

Cluster Z3146 is in a relaxed state.

Mass estimates from different methods agree within 25%.

Four gravitational arc candidates were identified.

Abstract

We present a detailed analysis of the medium redshift (z=0.2906) galaxy cluster Z3146 which is part of the ongoing ARCRAIDER project, a systematic search for gravitational arcs in massive clusters of galaxies. The analysis of Z3146 is based on deep optical wide field observations in the B, V and R bands obtained with the WFI@ESO2.2m, and shallow archival WFPC2@HST taken with the F606W filter, which are used for strong as well as weak lensing analyses. Additionally we have used publicly available XMM/Newton observations for a detailed X-ray analysis of Z3146. Both methods, lensing and X-ray, were used to determine the dynamical state and to estimate the total mass. We also identified four gravitational arc candidates. We find this cluster to be in a relaxed state, which is confirmed by a large cooling flow with nominal ~1600M_\odot per year, regular galaxy density and light distributions and a regular shape of the weak lensing mass reconstruction. The mass content derived with the different methods agrees well within 25% at r_{200}=1661 h_{70}^{-1}kpc indicating a velocity dispersion of \sigma_v=869^{+124}_{-153}km/s.