2007

Cosmological parameters from strong gravitational lensing and stellar dynamics in elliptical galaxies

Grillo, C., Lombardi, M., Bertin, G.

Understand

We show how the combination of observations related to strong gravitational lensing and stellar dynamics in ellipticals offers a new way to measure the cosmological matter and dark-energy density parameters.

A gravitational lensing estimate of the mass enclosed inside the Einstein circle can be obtained by measuring the Einstein angle, once the critical density of the system is known.
A model-dependent dynamical estimate of this mass can also be obtained by measuring the central velocity dispersion of the stellar component.
By assuming the well-tested homologous 1/r^{2} profile for the total density distribution in the lens elliptical galaxies, these two mass measurements can be properly compared.

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