SDSS J092455.87+021924.9: An interesting gravitationally lensed quasar from the sloan digital sky survey

Naohisa Inada, Robert H. Becker, Scott Burles, Francisco J. Castander, Daniel Eisenstein, Patrick B. Hall, David E. Johnston, Bartosz Pindor, Gordon T. Richards, Paul L. Schechter, Maki Sekiguchi, Richard L. White, J. Brinkmann, Joshua A. Frieman, S. J. Kleinman, Jurek Krzesiński, Daniel C. Long, Eric H. Neilsen, Peter R. Newman, Atsuko NittaDonald P. Schneider, S. Snedden, Donald G. York

Research output: Contribution to journalArticlepeer-review

83 Scopus citations


We report the discovery of a new gravitationally lensed quasar from the Sloan Digital Sky Survey, SDSS J092455.87+021924.9 (SDSS J0924+0219). This object was selected from among known SDSS quasars by an algorithm that was designed to select another known SDSS lensed quasar (SDSS J1226-0006A,B). Five separate components, three of which are unresolved, are identified in photometric follow-up observations obtained with the Magellan Consortium's 6.5 m Walter Baade Telescope at Las Campanas Observatory. Two of the unresolved components (designated A and B) are confirmed to be quasars with z = 1.524; the velocity difference is less than 100 km s-1 according to spectra taken with the W. M. Keck Observatory's Keck II Telescope at Mauna Kea, Hawaii. A third stellar component, designated C, has the colors of a quasar with redshift similar to components A and B. The maximum separation of the point sources is 1″.78. The other two sources, designated G and D, are resolved. Component G appears to be the best candidate for the lensing galaxy. Although component D is near the expected position of the fourth lensed component in a four-image lens system, its properties are not consistent with being the image of a quasar at z ∼ 1.5. Nevertheless, the identical redshifts of components A and B and the presence of component C strongly suggest that this object is a gravitational lens. Our observations support the idea that a foreground object reddens the fourth lensed component and that another unmodeled effect (such as micro- or millilensing) demagnifies it, but we cannot rule out the possibility that SDSS J0924+0219 is an example of the relatively rare class of " three-component " lens systems.

Original languageEnglish (US)
Pages (from-to)666-674
Number of pages9
JournalAstronomical Journal
Issue number2 1772
StatePublished - Aug 2003

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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