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Images for an Isothermal Ellipsoidal Gravitational Lens from a Single Real Algebraic Equation
Hideki Asada, Takashi Hamana, Masumi Kasai
We present explicit expressions for the lens equation for a cored isothermal ellipsoidal gravitational lens as a single real sixth-order algebraic equation in two approaches; 2-dim…
Non-Gaussian Tails of Cosmological Density Distribution Function from Dark Halo Approach
Atsushi Taruya, Takashi Hamana, Issha Kayo
We present a simple model based on the dark halo approach which provides a useful way to understand key points determining the shape of the non-Gaussian tails of the dark matter on…
Searching for dark matter halos in the Suprime-Cam 2 sq deg field
S. Miyazaki, T. Hamana, K. Shimasaku +13
We report the first result of weak gravitational lensing survey on a 2.1 sq deg Rc-band image taken with a wide field camera (Suprime-Cam) on the prime focus of 8.2 m Subaru Telesc…
Improving the Accuracy of Cosmic Magnification Statistics
Brice Menard, Takashi Hamana, Matthias Bartelmann +1
The systematic magnification of background sources by the weak gravitational-lensing effects of foreground matter, also called cosmic magnification, is becoming an efficient tool b…
Cosmic shear statistics in the Suprime-Cam 2.1 sq deg field: Constraints on Omega_m and sigma_8
T. Hamana, S. Miyazaki, K. Shimasaku +13
We present measurements of the cosmic shear correlation in the shapes of galaxies in the Suprime-Cam 2.1 deg^2 R_c-band imaging data. As an estimator of the shear correlation origi…
Subaru Spectroscopy of the Gravitational Lens HST 14176+5226: Implications for a Large Cosmological Constan
Youichi Ohyama, Takashi Hamana, Nobunari Kashikawa +8
We present new optical spectroscopy of the lens elliptical galax in the ``Einstein Cross'' lens system HST 14176+5226, using the Faint Object Camera and Spectrograph (FOCAS) of the…