A dormant overmassive black hole in the early Universe by Juodžbalis, I, Maiolino, R, Baker, WM, Tacchella, S, Scholtz, J, D’Eugenio, F, Witstok, J, Schneider, R, Trinca, A, Valiante, R, DeCoursey, C, Curti, M, Carniani, S, Chevallard, J, de Graaff, A, Arribas, S, Bennett, JS, Bourne, MA, Bunker, AJ, Charlot, S, Jiang, B, Koudmani, S, Perna, M, Robertson, B