Where Does The Dark Matter Begin?

Details Where Does The Dark Matter Begin? Where Does The Dark Matter Begin?

2004-12-03

arxiv.org/abs/astro-ph/0412089v1

Astronomy and Astrophysics

Astrophysics

to appear in The Impact of Gravitational Lensing on Cosmology (IAU 225), Y. Mellier and G. Meylan, eds

Scientific paper

10.1017/S1743921305002000

While there is convincing evidence that the central regions (r<>Re) are dominated by dark matter, the structure of early-type galaxies in the transition region (a few effective radii, Re) between the stars and the dark matter is unclear both locally and in gravitational lenses. Understanding the structure of galaxies in this transition region is a prerequisite for understanding dark matter halos and how they relate to the luminous galaxy. Potentially the best probe of this region is the sample of ~80 strong gravitational lenses. I review the determination of mass distributions using gravitational lenses using image positions, statistics, stellar dynamics, time delays and microlensing. While the present situation is confusing, there is little doubt that the existing problems can be resolved by further observations.

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