• Should I Stay or Should I Go? • Clumps and Inward Migration byNiloofar Sharei| Feb 11, 2026 |Daily Paper Summaries|0 comments Title: Clump-like Structures in High-Redshift Galaxies: Mass Scaling and Radial Trends from JADES Authors: Yongda Zhu , Marcia J. • Rieke , Zhiyuan Ji , Andrew J. • Bunker , Courtney Carreira , A. • Lola Danhaive, Qiao Duan , Eiichi Egami , Daniel J. • First Author’s Institute:Steward Observatory, University of Arizona, Tucson, AZ, USAStatus: Preprint on arXiv If you want to understand how galaxies build their structure, you can learn a lot by studying their “clumps”.

Article Summaries:

  • A new JWST/NIRCam study of ~3,600 galaxies from the JADES survey examines “clump‑like” star‑forming knots in galaxies between redshifts 2 and 8. By fitting and subtracting smooth Sérsic profiles, the authors isolate clumps and find their frequency rises toward cosmic noon (z ≈ 2) before declining at higher redshift, with incompleteness affecting the farthest systems. Clump abundance correlates more strongly with the Gini coefficient than with Sérsic index, indicating that internal light contrast better captures clumpiness. Photometric modeling shows typical clumps are low‑mass (10⁷-10⁸ M☉), actively star‑forming, and modestly dusty. A clear size-mass relation emerges, with clumps at later epochs being larger at fixed mass, suggesting evolving internal dynamics.

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