The Dark Galaxy Problem and the Effects of Substructure on Gravitational Lenses

Details The Dark Galaxy Problem and the Effects of Substructure on Gravitational Lenses The Dark Galaxy Problem and the Effects of Substructure on Gravitational Lenses

2001-09-20

arxiv.org/abs/astro-ph/0109347v1

Astronomy and Astrophysics

Astrophysics

5 pages, for proceedings of Marseille 2001 conference "Where's the Matter?", ed. L. Tresse & M. Treyer

Scientific paper

I argue that the cold dark matter (CDM) model requires that even within a few kpc of the center of a galactic halo a significant fraction (greater than a few percent) of the surface density is contained in substructures with masses > 10^3 solar masses. These structures should be light enough to avoid dynamical friction and dense enough to avoid tidal disruption. I then show using the results of numerical simulations that this substructure will significantly alter the flux ratios of multiply imaged quasars (QSOs) without changing the image positions. The degree to which this occurs will depend on the angular size of the QSO and thus the wavelength of the observations.

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