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Tresse, M. Bethermin, M. Franco, M. Hirschmann, M. Huertas-Company, M. Shuntov, M. Trebitsch, N. E. Drakos, O. Ilbert, P. A. Oesch, R. C. Arango-Toro, R. Massey, R. M. Rich, S. Gillman, S. Harish, S. Jin, S. M. Wilkins, S. Toft, V. Kokorev, W. Mercier, Y. Dubois","submitted_at":"2024-10-10T18:21:25Z","abstract_excerpt":"We study the stellar mass function (SMF) and the co-evolution with dark matter halos via abundance matching in the largest redshift range to date $0.2<z<12$ in $0.53 \\, {\\rm deg}^2$ imaged by JWST from the COSMOS-Web survey. At $z>5$, we find increased abundances of massive (log$\\, M_{\\star}/M_{\\odot}>10.5$) implying integrated star formation efficiencies (SFE) $\\epsilon_{\\star}\\equiv M_{\\star}\\, f_{\\rm b}^{-1} M_{\\rm halo}^{-1} \\gtrsim 0.5$. We find a flattening of the SMF at the high-mass end that is better described by a double power law at $z>5.5$. 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