The multiple merger assembly of a hyperluminous obscured quasar at redshift 4.6
The multiple merger assembly of a hyperluminous obscured quasar at redshift 4.6
复制标题
红移 4.6 处超发光模糊类星体的多次合并组装
DOI：
10.1126/science.aap7605
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发表时间：
2018-11-30
期刊：
影响因子：
56.9
通讯作者：
Leclercq, F.
中科院分区：
文献类型：
--
作者：
Diaz-Santos, T.;Assef, R. J.;Leclercq, F.
合并推动了一个强大的尘埃类星体大质量星系在早期宇宙中拥有中心的超大质量黑洞。当物质落向黑洞时，它会释放能量，并被观察到是类星体。天文学家发现了一群强大的遥远类星体，它们被尘埃遮挡住了，但它们是如何形成的还不清楚。Díaz-Santos等人。在亚毫米波长观察了被尘埃遮挡的类星体WISE J224607.56-052634.9，发现了三个通过气体和尘埃桥梁与类星体相连的小伴星星系。他们推断，星系合并既可以提供驱动类星体的原材料，也可以提供大量的尘埃来遮盖它。科学，本期第1034页星系合并可以提供原材料，在早期宇宙中驱动强大的尘埃观测到的类星体。星系合并和来自宇宙网络的气体吸积在早期推动了星系及其中心黑洞的增长。我们报道了在已知最明亮的星系WISE R2 24607.56−052634.9(W2246−0526)中发生的多重合并事件的光谱成像，该星系是大爆炸13亿年后红移4.6时的一个被尘埃遮挡的类星体。远红外尘埃连续谱观测显示，W2246−0526附近有三个星系伴星，它们的形态受到干扰，由可能由动力相互作用产生的尘埃流连接在一起。对潮汐尘埃桥的探测表明，W2246−0526正在吸积其邻近星系，这表明合并活动可能是最明亮的星系同时遮蔽和供给其中心超大质量黑洞的主要机制。
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 Galaxy mergers can provide the raw materials to drive powerful dust-observed quasars in the early Universe. 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.