431.06 - A Gravitationally Lensed Quasar at the Epoch of Reionization

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Jan 10th at 2:50 PM until 3:00 PM

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Author(s): X. Fan, J. Yang, M. Yue, A. Zabludoff, I. McGreer, D. Thompson, University of Arizona, Tucson, Arizona, UNITED STATES|F. Wang, J. Hennawi, University of California, Santa Barbara, Santa Barbara, California, UNITED STATES|C. Keeton, Rutgers University, Piscataway, New Jersey, UNITED STATES|F. Bian, European Southern Observatory, Santiago, New Jersey, CHILE|M. Bonaglia, INAF, Florence, New Jersey, ITALY|I. Georgiev, B. Venemans, F. Walter, MPIA, Heidelberg, New Jersey, GERMANY|J. Li, University of Michigan, Ann Arbor, Michigan, UNITED STATES|R. Naidu, Center for Astrophysics, Cambridge, Massachusetts, UNITED STATES|F. Pacucci, Yale University , New Haven, Connecticut, UNITED STATES|S. Rabien, MPE, Garching, Connecticut, GERMANY|X. Wu, R. wang, Peking University , Beijing, Connecticut, CHINA|
Institution(s): 1. University of Arizona, Tucson, AZ, United States. 2. University of California, Santa Barbara, Santa Barbara, CA, United States. 3. Rutgers University, Piscataway, NJ, United States. 4. European Southern Observatory, Santiago, Chile. 5. INAF, Florence, Italy. 6. MPIA, Heidelberg, Germany. 7. University of Michigan, Ann Arbor, MI, United States. 8. Center for Astrophysics, Cambridge, MA, United States. 9. Yale University , New Haven, CT, United States. 10. MPE, Garching, Germany. 11. Peking University , Beijing, China.
Contributing team(s): (none)
A high fraction of the most luminous high-redshift quasars was predicted to be lensed due to magnification bias. We report the discovery of a strongly lensed ultraluminous 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 HST imaging reveals a multiple imaged system with a maximum image separation 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. This discovery suggests that a significant population of strongly lensed, high redshift quasars could have been missed by previous surveys, as standard color selection fails when the quasar color is contaminated by the lensing galaxy flux.