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

Abstract

We present a first strong-lensing model for the galaxy cluster RM J121218.5+273255.1 ($z=0.35$; 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 ($z\gtrsim 6$) candidates based on both photometric redshift and the dropout technique. No prominent ($\gtrsim 5\sigma$) 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 ${\theta }_E\simeq 32\pm 3^{\prime \prime }$ ($z_s=2$), 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.

17 pages, 6 figures, 2 tables; To be submitted

References in corpus (14)

• Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
• Galaxies in the Hubble Ultra Deep Field: I. Detection, Multiband Photometry, Photometric Redshifts, and Morphology
• Dust in the reionization era: ALMA observations of a $z$=8.38 Galaxy
• Multiple Images of a Highly Magnified Supernova Formed by an Early-Type Cluster Galaxy Lens
• A GMBCG Galaxy Cluster Catalog of 55,424 Rich Clusters from SDSS DR7
• Hubble Space Telescope Combined Strong and Weak Lensing Analysis of the CLASH Sample: Mass and Magnification Models and Systematic Uncertainties
• Cluster Lenses
• Understanding caustic crossings in giant arcs: characteristic scales, event rates, and constraints on compact dark matter
• New redshift z ~ 9 galaxies in the Hubble Frontier Fields: Implications for early evolution of the UV luminosity density
• Discovery of a Very Bright Strongly-Lensed Galaxy Candidate at z ~ 7.6
• Microlensing of Extremely Magnified Stars near Caustics of Galaxy Clusters
• The strongest gravitational lenses: I. The statistical impact of cluster mergers
• Probability of magnification in the $\text{Hubble Frontier Fields}$ clusters
• RELICS: A Very Large (${\theta }_E\sim 40"$) Cluster Lens -- RXC J0032.1+1808

Cited by in corpus (2)

• JWST's PEARLS: Prime Extragalactic Areas for Reionization and Lensing Science: Project Overview and First Results
• A Spectroscopic View of the JWST/GTO Strong Lensing Cluster A1489