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arXiv · 2503.14280

Constraints on the early Universe star formation efficiency from galaxy clustering and halo modeling of H$\alpha$ and [O III] emitters

Marko Shuntov·Pascal A. Oesch·Sune Toft·Romain A. Meyer·Alba Covelo-Paz·Louise Paquereau·Rychard Bouwens·Gabriel Brammer·Viola Gelli·Emma Giovinazzo·Thomas Herard-Demanche·Garth D. Illingworth·Charlotte Mason·Rohan P. Naidu·Andrea Weibel·Mengyuan Xiao
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Abstract

We develop a theoretical framework to provide observational constraints on the early Universe galaxy-halo connection by combining measurements of the UV luminosity function (UVLF) and galaxy clustering via the 2-point correlation function (2PCF). We implemented this framework in the FRESCO and CONGRESS JWST NIRCam/grism surveys by measuring the 2PCF of spectroscopically selected samples of H$\alpha$ and [OIII] emitters at $3.8 9$ shows that a constant SFE-$M_{\rm h}$ fixed at $z=8$ cannot reproduce the observed UVLF and neither high maximum SFE nor high stochasticity alone can explain the high abundances of luminous galaxies seen by JWST. Extending the analysis of the UVLF and 2PCF to $z>9$ measured from wider surveys will be crucial in breaking degeneracies.

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Marko Shuntov, Pascal A. Oesch, Sune Toft, Romain A. Meyer, Alba Covelo-Paz, Louise Paquereau, Rychard Bouwens, Gabriel Brammer, Viola Gelli, Emma Giovinazzo, Thomas Herard-Demanche, Garth D. Illingworth, Charlotte Mason, Rohan P. Naidu, Andrea Weibel, Mengyuan Xiao. 2025-03-18. Constraints on the early Universe star formation efficiency from galaxy clustering and halo modeling of H$\alpha$ and [O III] emitters. https://doi.org/10.1051/0004-6361%2F202554618

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