%0 Journal Article %T The multiple merger assembly of a hyperluminous obscured quasar at redshift 4.6 %+ Centre de Recherche Astrophysique de Lyon (CRAL) %A Díaz-Santos, T. %A Assef, R. J. %A Blain, A. W. %A Aravena, M. %A Stern, D. %A Tsai, C. -W. %A Eisenhardt, P. %A Wu, J. %A Jun, H. D. %A Dibert, K. %A Inami, H. %A Lansbury, G. %A Leclercq, F. %< avec comité de lecture %@ 0036-8075 %J Science %I American Association for the Advancement of Science (AAAS) %V 362 %P 1034-1036 %8 2018 %D 2018 %Z 1811.05992 %Z 2018Sci...362.1034D %R 10.1126/science.aap7605 %K ASTRONOMY %K Astrophysics - Astrophysics of Galaxies %Z Sciences of the Universe [physics]Journal articles %X Galaxy mergers and gas accretion from the cosmic web drove the growth of galaxies and their central black holes at early epochs. We report spectroscopic imaging of a multiple merger event in the most luminous known galaxy, WISE J224607.56-052634.9 (W2246-0526), a dust-obscured quasar at redshift 4.6, 1.3 billion years after the Big Bang. Far-infrared dust continuum observations show three galaxy companions around W2246-0526 with disturbed morphologies, connected by streams of dust likely produced by the dynamical interaction. The detection of tidal dusty bridges shows that W2246-0526 is accreting its neighbors, suggesting that merger activity may be a dominant mechanism through which the most luminous galaxies simultaneously obscure and feed their central supermassive black holes. %G English %L insu-03711202 %U https://insu.hal.science/insu-03711202 %~ ENS-LYON %~ INSU %~ CNRS %~ UNIV-LYON1 %~ CRAL %~ UDL %~ UNIV-LYON %~ TEST3-HALCNRS