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arXiv · 2603.22239

A Bending in the Size-mass Relation of Star-forming Galaxies across $0.5 < z < 6.0$ at a Critical Stellar Mass of $10^{10}M_\odot$ Revealed by JWST

Longyue Chen·Tao Wang·Hanwen Sun·Ke Xu·Luwenjia Zhou·Tiancheng Yang·Maxime Tarrasse·Houjun Mo·Zhaozhou Li·Yangyao Chen·Avishai Dekel·Emanuele Daddi·Xuheng Ding·Mauro Giavalisco·David Elbaz
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Abstract

We investigate the rest-frame optical size-stellar mass relation of galaxies at $0.5 M_{\rm p}$, an increasing fraction of SFGs decouple from halo growth and become compact, likely associated with rapid bulge (and black hole) growth in $M_{\rm h} \gtrsim 10^{12} M_{\odot}$ halos. These compact SFGs are promising progenitors of massive QGs, as evidenced by their similar masses, surface brightness profiles, and morphologies. Their high number densities can account for the observed buildup of massive QGs at $z > 2$, suggesting that the compaction pathway, rather than major mergers of extended SFGs, dominates the formation of high-z massive QGs.

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Longyue Chen, Tao Wang, Hanwen Sun, Ke Xu, Luwenjia Zhou, Tiancheng Yang, Maxime Tarrasse, Houjun Mo, Zhaozhou Li, Yangyao Chen, Avishai Dekel, Emanuele Daddi, Xuheng Ding, Mauro Giavalisco, David Elbaz. 2026-03-23. A Bending in the Size-mass Relation of Star-forming Galaxies across $0.5 < z < 6.0$ at a Critical Stellar Mass of $10^{10}M_\odot$ Revealed by JWST. https://doi.org/10.3847/2041-8213/ae5a93

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