Validity of strong lensing statistics for constraints on the galaxy evolution model

Abstract

We examine the usefulness of the strong lensing statistics to constrain the evolution of the number density of lensing galaxies by adopting the values of the cosmological parameters determined by recent WMAP observation. For this purpose, we employ the lens-redshift test proposed by Kochanek (1992) and constrain the parameters in two evolution models, simple power-law model characterized by the power law indexes $n{u}_n$ and ${\nu }_v$ and the evolution model by Mitchell et al. (2005) based on CDM structure formation scenario. We use the well-defined lens sample from the Sloan Digital Sky Survey (SDSS) and this is similarly sized samples used in the previous studies. Furthermore, we adopt the velocity dispersion function of early-type galaxies based on SDSS DR1 and DR5. It turns out that the indexes of power-law model are consistent with the previous studies, thus our results indicate the mild evolution in the number and velocity dispersion of early-type galaxies out to z = 1. However we found that the values for p and q used by Mitchell et al. are inconsistent with the presently available observational data. More complete sample is necessary to withdraw more realistic determination on these parameters.

Accepted to MNRAS, 7 pages, 3 figures

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• Gravitational lenses and lens candidates identified from the COSMOS field
• Eight New Quasar Lenses from the Sloan Digital Sky Survey Quasar Lens Search
• New lensed quasars from the MUSCLES survey
• The velocity dispersion function of early-type galaxies and its redshift evolution: the newest results from lens redshift test
• Implications of the lens redshift distribution of strong lensing systems: cosmological parameters and the global properties of early-type galaxies
• A new gravitational lens from the MUSCLES survey: ULAS J082016.1+081216
• Velocity dispersion function evolution from strong lensing statistics
• Cosmological application of the lens-redshift probability distribution with improved galaxy-scale gravitational lensing sample
• Constraints on Holographic cosmologies from strong lensing systems