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-a emission at redshift z ≈ 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 ∼10-7, implying a physical connection between Lyman-a nebulae and the locations of rare protoclusters. Our findings imply that the most massive structures in the distant universe have a tremendous supply (≅1011 solar masses) of cool dense (volume density ≅1 cm-3) gas, which is in conflict with current cosmological simulations.

Hennawi, J., Prochaska, J., Cantalupo, S., & Arrigoni-Battaia, F. (2015). Quasar quartet embedded in giant nebula reveals rare massive structure in distant universe. SCIENCE, 348(6236), 779-783 [10.1126/science.aaa5397].

Quasar quartet embedded in giant nebula reveals rare massive structure in distant universe

Cantalupo S.;
2015

Abstract

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-a emission at redshift z ≈ 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 ∼10-7, implying a physical connection between Lyman-a nebulae and the locations of rare protoclusters. Our findings imply that the most massive structures in the distant universe have a tremendous supply (≅1011 solar masses) of cool dense (volume density ≅1 cm-3) gas, which is in conflict with current cosmological simulations.
Articolo in rivista - Articolo scientifico
Intergalactic Medium - galaxy formation - quasars
English
779
783
5
Hennawi, J., Prochaska, J., Cantalupo, S., & Arrigoni-Battaia, F. (2015). Quasar quartet embedded in giant nebula reveals rare massive structure in distant universe. SCIENCE, 348(6236), 779-783 [10.1126/science.aaa5397].
Hennawi, J; Prochaska, J; Cantalupo, S; Arrigoni-Battaia, F
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/297349
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