JWST XLSSC 122 Data Release

The JWST mosaic images of XLSSC 122 are hosted here. The data reduction was performed by Zach Scofield (Yonsei University). A description of the observations can be found in our strong lensing paper.

Slide to compare HST and JWST

Use the handle to sweep between the legacy HST color image and our JWST color composite. Full-resolution FITS images are linked below.

Image Comparison

HST color image JWST color image
JWSTHST
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Data Description

The images above show the galaxy cluster XLSSC 122 at a redshift of z=1.98.

A distant look into the past
JWST's deep imaging provides an exceptionally detailed look at this distant cluster, with a limiting magnitude of 30.9 in the deepest filter.
Imaging & processing
The JWST mosaics are resampled with a pixel scale of 0.02 arcsec/pixel using the JWST Science Calibration Pipeline, with systematic effects corrected with the Yonsei Observable UNiverse Group JWST pipeline
Notable features
The JWST imaging reveals two remarkable features: asymmetric ICL suggesting ongoing merger activity, and strong lensing arcs that signal a highly concentrated cluster core.

Data Access

Zenodo / DOI

FITS mosaics and weight files.

DOI: 10.5281/zenodo.16810356

Products

  • NIRCam mosaics (F090W, F200W, F277W, F356W)
  • Weight maps

How to Cite

Please cite the data DOI and our paper. Example BibTeX:

@dataset{Scofield2025JWSTRelease,
  author       = {Scofield, Zachary and Collaborators},
  title        = {JWST Cluster Field Data Release},
  year         = {2025},
  publisher    = {Zenodo},
  doi          = {10.5281/zenodo.16810356},
}

@ARTICLE{2025arXiv250808356F,
       author = {{Finner}, Kyle and {Cha}, Sangjun and {Scofield}, Zachary P. and {Jee}, M. James and {Lin}, Yu-heng and {Joo}, Hyungjin and {Park}, Hyosun and {Morishita}, Takahiro and {Faisst}, Andreas and {Lee}, Bomee and {Wang}, Wuji and {Chary}, Ranga-Ram},
        title = "{JWST Discovery of Strong Lensing from a Galaxy Cluster at Cosmic Noon: Giant Arcs and a Highly Concentrated Core of XLSSC 122}",
      journal = {arXiv e-prints},
     keywords = {Astrophysics of Galaxies, Cosmology and Nongalactic Astrophysics},
         year = 2025,
        month = aug,
          eid = {arXiv:2508.08356},
        pages = {arXiv:2508.08356},
          doi = {10.48550/arXiv.2508.08356},
archivePrefix = {arXiv},
       eprint = {2508.08356},
 primaryClass = {astro-ph.GA},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2025arXiv250808356F},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

About

This page is a lightweight, static site designed for GitHub Pages. Images are previews; for scientific work use the FITS files provided in the archive.