Position of the 3 best z ~ 8 candidates selected in this study in a size-luminosity diagram (red dots). For comparison purposes, we plotted the size of objects selected using the first Frontier Fields dataset (Kawamata et al. 2014; Laporte et al. 2014) and results from the HUDF (Ono et al. 2013). Lines display the size-luminosity relation assuming several star formation rate densities: 10 (black), 5 (dashed), and 1 (dash-dotted) M⊙ yr-1 kpc-2
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