JWST Discovery of Strong Lensing from a Galaxy Cluster at Cosmic Noon: Giant Arcs and a Highly Concentrated Core of XLSSC 122

Abstract

Our observations with the James Webb Space Telescope have made the remarkable discovery of strong gravitational lensing arcs from XLSSC 122 ($z=1.98$) - setting the record for the most distant galaxy cluster that exhibits strong lensing. The discovery of giant arcs enables a strong-lensing analysis and a measurement of the concentration of the dark matter halo. We perform a strong-lensing analysis of the cluster and measure the radial projected mass density profile. Our measurements reveal an exceptionally high concentration in the core of XLSSC 122. A Navarro--Frenk--White profile fit to the inner 100 kpc estimates the concentration to be $6.3\pm 0.5$. The high concentration of XLSSC 122 contributes to the emerging picture that massive structure formation in the early universe may proceed more rapidly than standard models suggest. We estimate the mass within 100 kpc to be $M$($R<$100 kpc) = $6.5\pm 0.7\times 10^{13}$ M${}_{\odot }$. Our mosaic images are made public at https://kylefinner.github.io/xlssc122 .

9 pages, 4 figures, submitted to ApJL

References in corpus (18)

• EAZY: A Fast, Public Photometric Redshift Code
• A Comprehensive Study on Galaxies at z~9-16 Found in the Early JWST Data: UV Luminosity Functions and Cosmic Star-Formation History at the Pre-Reionization Epoch
• The Atacama Cosmology Telescope: A Catalog of > 4000 Sunyaev-Zel'dovich Galaxy Clusters
• CLASH: Weak-Lensing Shear-and-Magnification Analysis of 20 Galaxy Clusters
• The Uchuu Simulations: Data Release 1 and Dark Matter Halo Concentrations
• Spectroscopic confirmation of two luminous galaxies at $z\sim 14$
• CLASH: The Concentration-Mass Relation of Galaxy Clusters
• lenstronomy II: A gravitational lensing software ecosystem
• UNCOVER: Illuminating the Early Universe -- JWST/NIRSpec Confirmation of $z>12$ Galaxies
• Clustering and Halo Abundances in Early Dark Energy Cosmological Models
• The XMM-LSS Survey: A well controlled X-ray cluster sample over the D1 CFHTLS area
• Spectroscopic confirmation of a mature galaxy cluster at redshift two
• Quiescent galaxies in a virialized cluster at redshift 2: Evidence for accelerated size-growth
• First Weak-lensing Results from "See Change": Quantifying Dark Matter in the Two Z>1.5 High-redshift Galaxy Clusters SPT-CL J2040-4451 and IDCS J1426+3508
• The First Weak-lensing Analysis with the James Webb Space Telescope: SMACS J0723.3-7327
• XLSSC 122 caught in the act of growing up: Spatially resolved SZ observations of a z=1.98 galaxy cluster
• The XXL survey. XLIX. Linking the members star formation histories to the cluster mass assembly in the z=1.98 galaxy cluster XLSSC 122
• Galaxy cluster virial quantities from extrapolating strong lensing mass profiles