期刊
SCIENCE
卷 348, 期 6236, 页码 779-783出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa5397
关键词
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资金
- Alexander von Humboldt foundation
- German Federal Ministry for Education and Research
- NSF [AST-1010004]
- W. M. Keck Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1010004] Funding Source: National Science Foundation
All galaxies once passed through a hyperluminous quasar phase powered by accretion onto a supermassive black hole. But because these episodes are brief, quasars are rare objects typically separated by cosmological distances. In a survey for Lyman-alpha emission at redshift z approximate to 2, we discovered a physical association of four quasars embedded in a giant nebula. Located within a substantial overdensity of galaxies, this system is probably the progenitor of a massive galaxy cluster. The chance probability of finding a quadruple quasar is estimated to be similar to 10(-7), implying a physical connection between Lyman-alpha nebulae and the locations of rare protoclusters. Our findings imply that the most massive structures in the distant universe have a tremendous supply (similar or equal to 10(11) solar masses) of cool dense (volume density similar or equal to 1 cm(-3)) gas, which is in conflict with current cosmological simulations.
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