LEGGOS I: The JWST LEGGOS Survey -- LEnsing and Galaxy Growth: Observing Substructures -- Unpacks the Nature of Clumpy Star Formation and Quenching in Gravitationally Lensed Galaxies beyond Cosmic Noon

arXiv:2606.20845 · astro-ph.GA, astro-ph.CO · Submitted 2026-06-18 · Read on arXiv

Gourav Khullar, Michael Florian, Matthew B. Bayliss, Taylor A. Hutchison, Brian Welch, Keren Sharon, Jane R. Rigby, Dylan Berry, T. Emil Rivera-Thorsen, Håkon Dahle, Sedona H. Price, Nikko J. Cleri, Julissa Sarmiento, Guillaume Mahler, Michael D. Gladders, Rachel Bezanson, Alex Ross, Pedram Abedi, Rion Oh, John Chisholm, Keunho Kim, Katherine E. Whitaker, Aleena Ebey, Cole Panzer, Jacqueline Antwi-Danso, Catherine Cerny, Suhyeon C. Choe, Juliana S. M. Karp, James W. Kulp, Tim B. Miller, Grace M. Olivier, M. Riley Owens, David J. Setton, Irene Shivaei, Erik Solhaug, Amritaansh Srivastava, Sierra Bet

astro-ph.GA, astro-ph.CO

Submitted: 2026-06-18

Comments: v2: updated LEGGOS + JWST/MAST citations based on new policies. v1: 42 pages, 13 figures, 11 tables. Submitted to ApJ. Data products, including NIRSpec IFS cubes + gravitational lens models will be released upon pub. acceptance (contact gkhullar@uw.edu). Zenodo link for LEGGOS logo files (CC-BY-NY-SA usage): https://zenodo.org/records/20721247. Intentionally submitted during LGBTQIA+ pride month

Code: https://github.com/JWST-Templates/jwst_templates

License: http://creativecommons.org/licenses/by-nc-sa/4.0/

The gist: We present first results from the JWST LEGGOS Survey (LEnsing and Galaxy Growth: Observing Substructures), aimed at studying the physics of clumpy star formation and quenching in eight lensed

Terminology

Abstract

We present first results from the JWST LEGGOS Survey (LEnsing and Galaxy Growth: Observing Substructures), aimed at studying the physics of clumpy star formation and quenching in eight lensed galaxies at z about2 --4. LEGGOS combines multiple Cycle 2 JWST GO programs (GO 4125, GO 3843) and Cycle 1 archival data, and utilizes strong gravitational lensing with NIRCam imaging and NIRSpec integral-field spectroscopy. LEGGOS targets UV-bright, highly magnified systems to resolve about 10--200 pc regions in both rest-frame optical continuum and nebular emission. This overview paper describes the survey design, data reduction and calibration strategy, and science-quality data products, and highlights early examples demonstrating how spectroscopy breaks key degeneracies inherent to photometry-only clump studies, including identifying recent quenching in previously-thought UV star forming galaxies. We introduce a uniform analysis framework that jointly models lensing reconstruction, multi-band photometry, and integral field spectroscopy to disentangle multiple stellar populations within individual clumps and their surrounding diffuse regions. Using maps of Balmer recombination lines and key emission line diagnostic ratios, we connect star formation histories, dust attenuation, and nebular conditions on sub-kpc scales -- LEGGOS galaxies range from uniform metallicities across the whole galaxy, to having higher clump metallicities and harder ionization conditions relative to diffuse regions. The full survey dataset, with simultaneous flux and morphology constraints on clumpy source-plane regions, and a flexible spectrophotometric SPS modeling approach, provides a direct bridge between parsec-scale star formation physics and galaxy assembly at and beyond cosmic noon, offering a robust and efficient means of resolving star formation in the first galaxies.

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