Mass Follows Light

Details Mass Follows Light Mass Follows Light

2001-06-27

arxiv.org/abs/astro-ph/0106495v1

Astronomy and Astrophysics

Astrophysics

to appear in the proceedings of the Yale Cosmology Workshop on the Shapes of Galaxies and Their Halos (10 pages, 3 figs)

Scientific paper

We use comparisons between the shapes of gravitational lens galaxies and models for their mass distributions to derive statistical constraints on the alignment of the mass distribution relative to the observed lens galaxy and on the strength of tidal shear perturbations. The mass distributions are aligned with the luminous galaxies, with a 10 degree upper limit on the rms dispersion in the angle between the major axes. Statistical constraints, such as our bound on the misalignment between mass and light, are an important new approach to reducing the uncertainties in individual lens models, particularly for lenses used to estimate the Hubble constant.

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