Journal article

Observations and theoretical implications of the large-separation lensed quasar SDSS J1004 4112

M Oguri, N Inada, CR Keeton, B Pindor, JF Hennawi, MD Gregg, RH Becker, K Chiu, Y Suto, EL Turner, J Annis, NA Bahcall, J Brinkmann, FJ Castander, DJ Eisenstein, JA Frieman, T Goto, JE Gunn, DE Johnston, SM Kent Show all



We study the recently discovered gravitational lens SDSS J1004+4112, the first quasar lensed by a cluster of galaxies. It consists of four images with a maximum separation of 14″.62. The system was selected from the photometric data of the Sloan Digital Sky Survey (SDSS) and has been confirmed as a lensed quasar at z = 1.734 on the basis of deep imaging and spectroscopic follow-up observations. We present color-magnitude relations for galaxies near the lens plus spectroscopy of three central cluster members, which unambiguously confirm that a cluster at z = 0.68 is responsible for the large image separation. We find a wide range of lens models consistent with the data, and despite considerab..

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University of Melbourne Researchers