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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29307
Title: The Discovery of a Gravitationally Lensed Quasar at z = 6.51
Authors: Fan, Xiaohui
Wang, Feige
Yang, Jinyi
Keeton, Charles R.
Yue, Minghao
Zabludoff, Ann
Bian, Fuyan
BONAGLIA, MARCO 
Georgiev, Iskren Y.
Hennawi, Joseph F.
Li, Jiangtao
McGreer, Ian D.
Naidu, Rohan
Pacucci, Fabio
Rabien, Sebastian
Thompson, David
Venemans, Bram
Walter, Fabian
Wang, Ran
Wu, Xue-Bing
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL LETTERS 
Number: 870
Issue: 2
First Page: L11
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.
URI: http://hdl.handle.net/20.500.12386/29307
URL: https://iopscience.iop.org/article/10.3847/2041-8213/aaeffe
ISSN: 2041-8205
DOI: 10.3847/2041-8213/aaeffe
Bibcode ADS: 2019ApJ...870L..11F
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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