A new gravitational lens from the MUSCLES survey: ULAS J082016.1+081216
Corresponding Author
Neal Jackson
Jodrell Bank Centre for Astrophysics, University of Manchester, Turing Building, Oxford Road, Manchester M13 9PL
E-mail: [email protected]Search for more papers by this authorEran O. Ofek
Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
Search for more papers by this authorMasamune Oguri
Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Menlo Park, CA 94025, USA
Search for more papers by this authorCorresponding Author
Neal Jackson
Jodrell Bank Centre for Astrophysics, University of Manchester, Turing Building, Oxford Road, Manchester M13 9PL
E-mail: [email protected]Search for more papers by this authorEran O. Ofek
Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
Search for more papers by this authorMasamune Oguri
Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Menlo Park, CA 94025, USA
Search for more papers by this authorABSTRACT
We present observations of a new double-image gravitational lens system, ULAS J082016.1+081216, of image separation 2.3 arcsec and high (∼6) flux ratio. The system is selected from the Sloan Digital Sky Survey (SDSS) spectroscopic quasar list using new high-quality images from the UKIRT (United Kingdom Infrared Telescope) Deep Sky Survey (UKIDSS). The lensed quasar has a source redshift of 2.024, and we identify the lens galaxy as a faint red object of redshift 0.803 ± 0.001. Three other objects from the UKIDSS survey, selected in the same way, were found not to be lens systems. Together with the earlier lens found using this method, the SDSS–UKIDSS lenses have the potential to significantly increase the number of quasar lenses found in SDSS, to extend the survey to higher flux ratios and lower separations, and to give greater completeness which is important for statistical purposes.
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