Keeton, Charles R.
Georgiev, Iskren Y.
Hennawi, Joseph F.
McGreer, Ian D.
AffiliationUniv Arizona, Steward Observ
Keywordsgravitational lensing: strong
quasars: individual (J0439+1634)
quasars: supermassive black holes
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationFan, X., Wang, F., Yang, J., Keeton, C. R., Yue, M., Zabludoff, A., ... & Wu, X-B. (2019). The Discovery of a Gravitationally Lensed Quasar at z=6.51. The Astrophysical Journal Letters, 870(2), L11.
JournalASTROPHYSICAL JOURNAL LETTERS
Rights© 2019. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractStrong 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 theta similar to 0 ''.2, best explained by a model of three quasar images lensed by a low-luminosity galaxy at z similar to 0.7, with a magnification factor of similar to 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.
VersionFinal published version
SponsorsUS NSF [AST-1716585, AST-1515115]; NASA ADAP [NNX17AF28G]; Space Telescope Science Institute [HST-GO-13644]; NSF [AST-1211874]; NASA Chandra award [AR8-19021A]; Yale Keck program [Y144]; ERC grant "Cosmic Dawn"; NSFC ; ERC grant "Cosmic Gas"