Is There a Quad Problem among Optical Gravitational Lenses?

Abstract

Most of 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.

9 pages, 4 figures, invited contribution to appear in New Journal of Physics (Focus on Gravitational Lensing)

References in corpus (30)

• The Sloan Digital Sky Survey: Technical Summary
• The SDSS Quasar Survey: Quasar Luminosity Function from Data Release Three
• The 2dF QSO Redshift Survey - XII. The spectroscopic catalogue and luminosity function
• The 2dF QSO Redshift Survey - I. The Optical QSO Luminosity Function
• The Cosmic Lens All-Sky Survey: I. Source selection and observations
• The Cosmic Lens All-Sky Survey:II. Gravitational lens candidate selection and follow-up
• Early-type galaxies in the SDSS. II. Correlations between observables
• Shear and Ellipticity in Gravitational Lenses
• The velocity dispersion function of early-type galaxies
• Internal and Collective Properties of Galaxies in the Sloan Digital Sky Survey
• WFPC2 Images of the Central Regions of Early-Type Galaxies - I. The Data
• The 2dF-SDSS LRG and QSO Survey: The z<2.1 Quasar Luminosity Function from 5645 Quasars to g=21.85
• The Sloan Digital Sky Survey Quasar Lens Search. I. Candidate Selection Algorithm
• The Cosmic Lens All-Sky Survey: statistical strong lensing, cosmological parameters, and global properties of galaxy populations
• SDSS J092455.87+021924.9: an Interesting Gravitationally Lensed Quasar from the Sloan Digital Sky Survey
• Effects of Triaxiality on the Statistics of Large-Separation Gravitational Lenses
• The image separation distribution of strong lenses: Halo versus subhalo populations
• The Flat Spectrum Radio Luminosity Function, Gravitational Lensing, Galaxy Ellipticities and Cosmology
• Why is the Fraction of Four-Image Radio Lens Systems So High?
• Discovery of Two Gravitationally Lensed Quasars with Image Separations of 3 Arcseconds from the Sloan Digital Sky Survey
• A Spectroscopic Survey of Faint Quasars in the SDSS Deep Stripe: I. Preliminary Results from the Co-added Catalog
• The First FIRST Gravitationally Lensed Quasar: FBQ 0951+2635
• Effects of Ellipticity and Shear on Gravitational Lens Statistics
• SDSS J0246-0825: A New Gravitationally Lensed Quasar from the Sloan Digital Sky Survey
• SDSS J1335+0118: A New Two-Image Gravitational Lens
• SDSS J0806+2006 and SDSS J1353+1138: Two New Gravitationally Lensed Quasars from the Sloan Digital Sky Survey
• Cosmological Parameters from the SDSS DR5 Velocity Dispersion Function of Early-Type Galaxies through Radio-Selected Lens Statistics
• The Effects of Massive Substructures on Image Multiplicities in Gravitati onal Lenses
• SDSSJ102111.02+491330.4: A Newly Discovered Gravitationally Lensed Quasar
• Two New Gravitationally Lensed Double Quasars from the Sloan Digital Sky Survey

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• The Sloan Digital Sky Survey Quasar Lens Search. IV. Statistical Lens Sample from the Fifth Data Release
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• Galaxy density profiles and shapes -- II. selection biases in strong lensing surveys
• Mass models and environment of the new quadruply lensed quasar SDSS J1330+1810
• The impact of $\Lambda$CDM substructure and baryon-dark matter transition on the image positions of quad galaxy lenses
• A search for disk-galaxy lenses in the Sloan Digital Sky Survey
• Exact interacting Green's function for the Anderson impurity at high bias voltages