paper

A Strong-Lensing Model for the WMDF JWST/GTO Very Rich Cluster Abell 1489

arXiv:2007.11600 · doi:10.3847/1538-4357/abb8dd

Abstract

We present a first strong-lensing model for the galaxy cluster RM J121218.5+273255.1 (; hereafter RMJ1212; also known as Abell 1489). This cluster is amongst the top 0.1\% richest clusters in the redMaPPer catalog; it is significantly detected in X-ray and through the Sunyaev-Zel'dovich effect in ROSAT and \emph{Planck} data, respectively; and its optical luminosity distribution implies a very large lens, following mass-to-light scaling relations. Based on these properties it was chosen for the Webb Medium Deep Fields (WMDF) JWST/GTO program. In preparation for this program, RMJ1212 was recently imaged with GMOS on Gemini North and in seven optical and near-infrared bands with the \emph{Hubble Space Telescope}. We use these data to map the inner mass distribution of the cluster, uncovering various sets of multiple images. We also search for high-redshift candidates in the data, as well as for transient sources. We find over a dozen high-redshift () candidates based on both photometric redshift and the dropout technique. No prominent () transients were found in the data between the two HST visits. Our lensing analysis reveals a relatively large lens with an effective Einstein radius of (), in broad agreement with the scaling-relation expectations. RMJ1212 demonstrates that powerful lensing clusters can be selected in a robust and automated way following the light-traces-mass assumption.

arXiv comment17 pages, 6 figures, 2 tables; To be submitted

References in corpus (64)

Cited by in corpus (2)