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Large-Separation Lensed Quasars in the SDSS

Published online by Cambridge University Press:  15 June 2005

Masamune Oguri
Masamune Oguri
Affiliation:
Department of Physics, University of Tokyo, Tokyo, 113-0033, JAPAN email: oguri@utap.phys.s.u-tokyo.ac.jp
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Abstract

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The existence of lensed quasars with splitting angles larger than $7''$ has been predicted on the basis of the cold dark matter model. We searched for these large-separation lensed quasars from the spectroscopically classified $\sim40,000$ quasars obtained by the Sloan Digital Sky Survey (SDSS), and succeeded in discovering the first lensed quasar by a cluster of galaxies, SDSS J1004+4112: It consists of four images, and the maximum separation is $14.62''$. Here we describe the discovery and the follow-up observations of this system, as well as the latest results of the large-separation lens search in the SDSS. We also present the new statistical model which fully incorporates non-sphericity of dark halos, and compare the theoretical predictions with the SDSS results.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS225 , July 2004 , pp. 407 - 412
Copyright
© 2004 International Astronomical Union