HST-Based Lens Model of the First Extragalactic JWST Science Target, SDSS J1226+2152, in Preparation for TEMPLATES

Kavli Affiliate: Michael D. Gladders

| First 5 Authors: Keren Sharon, Catherine Cerny, Jane R. Rigby, Michael K. Florian, Matthew B. Bayliss

| Summary:

SDSS J1226+2152 is the first extragalactic science target to be observed by
JWST. The strongly lensed z=2.9233 Lyman break galaxy, SGAS J122651.3+215220,
lensed by a cluster at z=0.4358, was targeted as part of the JWST-ERS program
TEMPLATES: Targeting Extremely Magnified Panchromatic Lensed Arcs and their
Extended Star formation. Aiming to combine the exquisite capabilities of JWST
with the extreme magnification provided by strong gravitational lensing, these
observations will peer into galaxies at cosmic noon and probe the building
blocks of star formation. Here, we present an Hubble Space Telescope strong
lensing analysis, lens model, source-plane interpretation, and the lensing
outputs needed to analyze the JWST observations in the context of the source’s
intrinsic properties. The lens model outputs are made publicly available to the
community through the Mikulski Archive for Space Telescopes (MAST) Portal.

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