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The Subaru Seminar is usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you are interested in giving a seminar, please contact Subaru seminar organizers (Tae-Soo Pyo, Sherry Yeh, Nagayoshi Ohashi) by email : (please change"_at" to @).

May 14, Thursday, 11:00 am in 104

" Lens statistics with gravitationally lensed yet morphologically regular images "

Toshifumi Futamase

(Tohoku University)

GRAMORs are strongly magnified lensed images with small distortion. One example is discovered in a cluster MACS J1149.5+2223 in 2009. We investigate the lens statistics of GRAMORs in detail. Assuming NFW profile for our sample of clusters, we calculate the expected number and redshift distribution of GRAMORs using parameters given by COSMOS data for the number density of the background galaxy. Our model of the cluster placed at z= 0.544 and the background galaxies with WMAP 5 cosmology predicts the redshift of GRAMOR at z ~= 1.49 which is close to the observed z=1.4906. It is found that the probability distribution function of GRAMORs depends strongly on the existence of the dark energy and maybe useful for constraining the nature of dark energy.

Seminars are also held at JAC, CFHT, and IfA.

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