The Third Image of the Large-Separation Lensed Quasar SDSS J1029+2623

Details The Third Image of the Large-Separation Lensed Quasar SDSS J1029+2623 The Third Image of the Large-Separation Lensed Quasar SDSS J1029+2623

2008-01-31

arxiv.org/abs/0802.0002v1

Astrophys.J.676:L1-L4,2008

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, accepted for publication in ApJ Letters

Scientific paper

10.1086/586897

We identify a third image in the unique quasar lens SDSS J1029+2623, the second known quasar lens produced by a massive cluster of galaxies. The spectrum of the third image shows similar emission and absorption features, but has a redder continuum than the other two images which can be explained by differential extinction or microlensing. We also identify several lensed arcs. Our observations suggest a complicated structure of the lens cluster at z~0.6. We argue that the three lensed images are produced by a naked cusp on the basis of successful mass models, the distribution of cluster member galaxies, and the shapes and locations of the lensed arcs. Lensing by a naked cusp is quite rare among galaxy-scale lenses but is predicted to be common among large-separation lensed quasars. Thus the discovery can be viewed as support for an important theoretical prediction of the standard cold dark matter model.

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