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  The Discovery of a Gravitationally Lensed Quasar at z = 6.51

Fan, X., Wang, F., Yang, J., Keeton, C. R., Yue, M., Zabludoff, A., et al. (2019). The Discovery of a Gravitationally Lensed Quasar at z = 6.51. The Astrophysical Journal, 870.

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Fan, Xiaohui1, Author
Wang, Feige1, Author
Yang, Jinyi1, Author
Keeton, Charles R.1, Author
Yue, Minghao1, Author
Zabludoff, Ann1, Author
Bian, Fuyan1, Author
Bonaglia, Marco1, Author
Georgiev, Iskren Y.1, Author
Hennawi, Joseph F.1, Author
Li, Jiangtao1, Author
McGreer, Ian D.1, Author
Naidu, Rohan1, Author
Pacucci, Fabio1, Author
Rabien, Sebastian1, Author
Thompson, David1, Author
Venemans, Bram1, Author
Walter, Fabian1, Author
Wang, Ran1, Author
Wu, Xue-Bing1, Author
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1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: gravitational lensing: strong quasars: individual: J0439+1634 quasars: supermassive black holes Astrophysics - Astrophysics of Galaxies
 Abstract: Strong gravitational lensing provides a powerful probe of the physical properties of quasars and their host galaxies. A high fraction of the most luminous high-redshift quasars was predicted to be lensed due to magnification bias. However, no multiple imaged quasar was found at z > 5 in previous surveys. We report the discovery of J043947.08+163415.7, a strongly lensed quasar at z = 6.51, the first such object detected at the epoch of reionization, and the brightest quasar yet known at z > 5. High-resolution Hubble Space Telescope imaging reveals a multiple imaged system with a maximum image separation θ ̃ 0.″2, best explained by a model of three quasar images lensed by a low-luminosity galaxy at z ̃ 0.7, with a magnification factor of ̃50. The existence of this source suggests that a significant population of strongly lensed, high-redshift quasars could have been missed by previous surveys, as standard color selection techniques would fail when the quasar color is contaminated by the lensing galaxy.

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 Dates: 2019
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 870 Sequence Number: - Start / End Page: - Identifier: -