The central image of a gravitationally lensed quasar

@article{Winn2004TheCI,
  title={The central image of a gravitationally lensed quasar},
  author={Joshua N. Winn and David Joseph Rusin and Christopher S. Kochanek},
  journal={Nature},
  year={2004},
  volume={427},
  pages={613-615}
}
A galaxy can act as a gravitational lens, producing multiple images of a background object. Theory predicts that there should be an odd number of images produced by the lens, but hitherto almost all lensed objects have two or four images. The missing ‘central’ images, which should be faint and appear near the centre of the lensing galaxy, have long been sought as probes of galactic cores too distant to resolve with ordinary observations. There are five candidates for central images, but in one… 
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