Intrinsic Degeneracy of Gravitational Lens Time Delays: the case for a simple quadruple system in $Λ$CDM cosmology

Details Intrinsic Degeneracy of Gravitational Lens Time Delays: the case for a simple quadruple system in $Λ$CDM cosmology Intrinsic Degeneracy of Gravitational Lens Time Delays: the case for a simple quadruple system in $Λ$CDM cosmology

2002-09-10

arxiv.org/abs/astro-ph/0209191v2

Astrophys.J. 582 (2003) 2-5

Astronomy and Astrophysics

Astrophysics

5pp w/ 3 color eps fig (To be published in ApJ 582, 1/1/2003 Issue)

Scientific paper

10.1086/344474

A degeneracy in strong lens model is shown analytically. The observed time delays and quasar image positions might {\it not} uniquely determine the concentration and the extent of the lens galaxy halo mass distribution. Simply hardwiring the Hubble constant ($H_0$) and the cosmology ($\Omega, \Lambda$) to the standard values of $\Lambda$CDM cosmology might {\it not} fully lift this degeneracy, which exists rigourously even with very accurate data. Equally good fits to the images could be found in lens mass models with either a mostly Keplerian or a flat rotation curve. This degeneracy in mass models makes the task of getting reliable $H_0$ and $\Lambda$ from strong lenses even more daunting.

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