Prog. Theor. Phys. Vol. 107 No. 3 (2002) pp. 625-630

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Letters

Lens Model Degeneracy and Cosmological Tests by Strong Gravitational Lensing

Takeshi Chiba and Ryuichi Takahashi

Department of Physics, Kyoto University, Kyoto 606-8502, Japan

(Received November 5, 2001)

Abstract:

We estimate the sensitivity of lensing observables to the parameters in the lens model (isothermal sphere/Navarro-Frenk-White profile) parameters and to cosmological parameters. We find that the observables are primarily dependent on the lens model parameters, while the dependence on cosmological parameters is minor (especially so for the dark energy parameters). We demonstrate the lens model degeneracy by deriving both the projected mass density profile and the circular velocity profile. We also identify a possible source of the problem of fitting the averaged mass profile of CL 0024+1654 with the Navarro-Frenk-White profile.

URL : http://ptp.ipap.jp/link?PTP/107/625/
DOI : 10.1143/PTP.107.625

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Citing Article(s) :

Progress of Theoretical Physics Vol. 108 No. 5 (2002) pp. 809-818 :
Is Dark Energy the Only Solution to the Apparent Acceleration of the Present Universe?

Hideo Iguchi, Takashi Nakamura and Ken-ichi Nakao