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

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Science  30 Nov 2018:
Vol. 362, Issue 6418, pp. 1034-1036
DOI: 10.1126/science.aap7605

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Mergers drive a powerful dusty quasar

Massive galaxies in the early Universe host supermassive black holes at their centers. When material falls toward the black hole, it releases energy and is observed as a quasar. Astronomers found a population of powerful distant quasars that are obscured by dust, but it has been unclear how they are formed. Díaz-Santos et al. observed the dust-obscured quasar WISE J224607.56-052634.9 at submillimeter wavelengths, finding three small companion galaxies connected to the quasar by bridges of gas and dust. They inferred that galaxy mergers can provide both the raw material to power a quasar and large quantities of dust to obscure it.

Science, this issue p. 1034