Discovery of an Unusual Gravitational Lens

Caltech press release: plain text file or link * EPFL press release * Georges Meylan YouTube video * Keck press release
Discovery paper: PDF file or astro-ph archive link

Image credit: F. Courbin, S. G. Djorgovski, G. Meylan, et al., Caltech / EPFL / WMKO

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Image of the quasar SDSS J0013+1523 (blue), bracketed by the lensed images of the background galaxy (red), obtained with the W. M. Keck Observatory's 10-m telescope and Adaptive Optics.

The same, but without the labels:

An illustration of the gravitational lensing:

For more information, please contact:

George Djorgovski,
ph. +1 (626) 395-4415
email: george @

Learn more about Gravitational lensing * Quasars * Adaptive optics

Some coverage: Science * Nature Research Highlights * Discovery News * Universe Today * Space Daily * PhysOrg * EurekAlert * Scientific Computing * Sify news * Softpedia * Sciences et Avenir (in French) * FuturaSciences (in French) * Le Scienze /Republica (in Italian) * Honolulu Star-Advertiser * Daily News and Analysis * Deccan Herald * Central Chronicle * ZeeNews * Science Blogs * Machines Like Us * * * redOrbit * AstroArts (Japanese) * * *

Other pertinent links:

W. M. Keck Observatory
Caltech Media Relations
Laboratory of Astrophysics of EPFL