HongSheng Zhao and Bo Qin 2003 ApJ 582 2 doi:10.1086/344474
HongSheng Zhao1,2 and Bo Qin1,2
Show affiliationsA degeneracy in the strong lens model is shown analytically. The observed time delays and quasar image positions might not uniquely determine the concentration and the extent of the lens galaxy halo mass distribution. Simply hard wiring the Hubble constant (H0) and the cosmology (Ω, Λ) to the standard Λ cold dark matter cosmology values might not fully lift this degeneracy, which exists rigorously 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 H0 and Λ from strong lenses even more daunting.
cosmological parameters; dark matter; distance scale; gravitational lensing
Issue 1 (2003 January 1)
Received 2002 July 3, accepted for publication 2002 August 28
HongSheng Zhao and Bo Qin 2003 ApJ 582 2
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