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The multiple merger assembly of a hyperluminous obscured quasar at redshift 4.6

Abstract : 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.
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Submitted on : Friday, July 1, 2022 - 11:22:40 AM
Last modification on : Monday, July 4, 2022 - 3:33:59 AM

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T. Díaz-Santos, R. J. Assef, A. W. Blain, M. Aravena, D. Stern, et al.. The multiple merger assembly of a hyperluminous obscured quasar at redshift 4.6. Science, 2018, 362, pp.1034-1036. ⟨10.1126/science.aap7605⟩. ⟨insu-03711202⟩

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