The Expected Properties of Dark Lenses

Details The Expected Properties of Dark Lenses The Expected Properties of Dark Lenses

2002-02-20

arxiv.org/abs/astro-ph/0202360v2

2002 ApJ 572 705

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1086/340367

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.

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