Masamune Oguri 2007 New J. Phys. 9 442 doi:10.1088/1367-2630/9/12/442
Is there a quad problem among optical gravitational lenses?
Focus on Gravitational LensingMasamune Oguri
Show affiliationsPart of Focus on Gravitational Lensing
Most of the optical gravitational lenses recently discovered in the Sloan Digital Sky Survey Quasar Lens Search (SQLS) have two-images rather than four-images, in marked contrast to radio lenses for which the fraction of four-image lenses (quad fraction) is quite high. We revisit the quad fraction among optical lenses by taking the selection function of the SQLS into account. We find that the current observed quad fraction in the SQLS is indeed lower than, but consistent with, the prediction of our theoretical model. The low quad fraction among optical lenses, together with the high quad fraction among radio lenses, implies that the quasar optical luminosity function has a relatively shallow faint end slope.
- PACS
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Instrumentation and measurement
- Dates
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Issue 12 (December 2007)
Received 24 February 2007
Published 17 December 2007
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Is there a quad problem among optical gravitational lenses?
Masamune Oguri 2007 New J. Phys. 9 442
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