Constraints on photoionization feedback from number counts of ultra-faint high-redshift galaxies in the Frontier Fields

M. Castellano, B. Yue, A. Ferrara +11

We exploit a sample of ultra-faint high-redshift galaxies (demagnified HST $H_{160}$ magnitude $>30$) in the Frontier Fields clusters A2744 and M0416 to constrain a theoretical mod…