The Expected Properties of Dark Lenses

Abstract

We investigate the properties of multiple-image gravitational lens systems formed by dark matter halos. Both the Navarro-Frenk-White (NFW) and Moore et al. mass profiles are considered, and the effects of quadrupole perturbations to the lensing potential are taken into account. The systems produced by dark halos exhibit two generic properties that serve as powerful benchmarks for scrutinizing individual lens candidates: small flux ratios between the two brightest images in triples, and detectable odd images. In contrast, most currently ambiguous quasar pairs consist of two components with flux ratios > 3:1. Such systems are statistical outliers in the expected distribution of dark lenses, and are therefore likely to be binary quasars.

final version, minor corrections, 18 pages, ApJ June 20 2002

References in corpus (11)

• The Luminosity Function of Galaxies in SDSS Commissioning Data
• Direct Detection of CDM Substructure
• Compound gravitational lensing as a probe of dark matter substructure within galaxy halos
• CDM and Strong Lensing: Concord or Conflict?
• Global Probes of the Impact of Baryons on Dark Matter Halos
• Cusped Mass Models Of Gravitational Lenses
• Lensing Constraints on the Cores of Massive Dark Matter Halos
• Strong Gravitational Lensing and Dark Energy
• Resolved nuclear CO(1-0) emission in APM08279+5255: Gravitational lensing by a naked cusp?
• Evolution of the Luminosity Function and Colors of Galaxies in a Lambda-CDM Universe
• Chandra Observations of the QSO Pair Q2345+007: Binary Quasar or Massive Dark Lens?

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• The Sloan Digital Sky Survey Quasar Lens Search. IV. Statistical Lens Sample from the Fifth Data Release
• Gravitational Lensing by a Compound Population of Halos: Standard Models
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• Constraints on the Baryonic Compression and Implications for the Fraction of Dark Halo Lenses
• Detecting low-mass haloes with strong gravitational lensing II: constraints on the density profiles of two detected subhaloes
• Statistics of Quasars Multiply Imaged by Galaxy Clusters
• Is the Optically Unidentified Radio Source, FIRST J121839.7+295325, a Dark Lens?
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