SDSS J102111.02+491330.4: A newly discovered gravitationally lensed quasar

Bart Pindor, Daniel J. Eisenstein, Michael D. Greeg, Robert H. Becker, Naohisa Inada, Masamune Oguri, Patrick B. Hall, David E. Johnston, Gordon T. Richards, Donald P. Schneider, Edwin L. Turner, Guido Brasi, Philip M. Hinz, Matthew A. Kenworthy, Doug Miller, J. C. Barentine, Howard J. Brewington, J. Brinkmann, Michael Harvanek, S. J. KleinmanJurek Krzesinski, Dan Long, Eric H. Neilsen, Peter R. Newman, Atsuko Nitta, Stephanie A. Snedden, Donald G. York

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


We report follow-up observations of two gravitational lens candidates identified in the Sloan Digital Sky Survey (SDSS) data set. We have confirmed that SDSS J102111.02+491330.4 is a previously unknown gravitationally lensed quasar. This lens system exhibits two images of a z = 1.72 quasar, with an image separation of 1.″14 ± 0.″ 04. Optical and near-IR imaging of the system reveals the presence of the lensing galaxy between the two quasar images. Observations of SDSS J112012.12+671116.0 indicate that it is more likely a binary quasar than a gravitational lens. This system has two quasars at a redshift of z = 1.49, with an angular separation of 1.″49 ± 0.″02. However, the two quasars have markedly different spectral energy distributions, and no lens galaxy is apparent in optical and near-IR images of this system. We also present a list of 31 SDSS lens candidates that follow-up observations have confirmed are not gravitational lenses.

Original languageEnglish (US)
Pages (from-to)41-48
Number of pages8
JournalAstronomical Journal
Issue number1
StatePublished - Jan 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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