Accelerated evolution of galaxy host halo masses during Cosmic Dawn from deep JWST clustering

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Authors: Nicolò Dalmasso, Giovanni Ferrami, Nicha Leethochawalit, Emanuele M Ventura, Michele Trenti
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Abstract

We present the deepest clustering analysis of early galaxies to date, analyzing $N_{\rm{g}} \simeq 6500$ photometrically-selected Lyman Break Galaxies from JWST's Advanced Deep Extragalactic Survey (JADES) to reveal how galaxies and dark matter evolved during cosmic dawn ($5 \leq z < 11$). Using halo occupation distribution (HOD) modeling of the two-point angular correlation function, we trace the galaxy-halo relationships across the first billion years of cosmic history. Our analysis reveals that galaxies at $z = 10.6$ reside in dark matter halos over an order of magnitude less massive ($M_{\rm{h}} \sim 10^{10.12} M_{\odot}$) than their counterparts at $z = 5.5$ ($M_{\rm{h}} \sim 10^{11.45} M_{\odot}$), while exhibiting correspondingly higher effective bias values ($b_{\rm{g}}^{\rm{eff}} = 8.13^{+0.04}_{-0.02}$ compared to $5.64^{+0.10}_{-0.13}$). Correspondingly, the satellite galaxy fraction hints at a declining trend with decreasing redshift, reaching $

Fields of Study & Subjects

Galaxies: Formation Evolution Phenomena Astronomy and Astrophysical Research Dark Matter and Cosmic Phenomena

Publication details

Journal / source
arXiv (Cornell University)
Publication date
5 January 2026
Document type
Preprint