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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 @).

January 16, Thursday, at 11:00 am

" Subaru Telescope Adaptive Optics Observations of the SDSS Gravitationally Lensed Quasars "

Cristian Eduard Rusu

(University of Tokyo/NAOJ)

I will describe a campaign of imaging observations of the gravitationally lensed quasars from the SDSS database, using the Subaru Telescope Adaptive Optics (IRCS+AO188). Eighteen lensed quasars and two lensed quasar candidates were observed for 10-20 minutes, mostly in the laser guide star mode. The sample consists mostly of doubles, and one quad. The purpose of the campaign is to obtain accurate relative astrometry, photometry and lens shapes for each system, reveal detail unseen in existing low-resolution data, and constrain accurate mass models. Due to weather variability and low Strehl ratios ≲10%, separately observed stars do not constitute accurate PSF representations, and the PSF was built on target, either as a 2 Moffat analytical profile or as a hybrid (a core component from the observed quasar images, and analytical wings). I will describe the observations, data analysis and simulations, present new results on selected systems, and general results on the alignment and ellipticity of mass and light, as well as the mean radial mass profile of elliptical galaxies, from the combination of multiple samples.

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

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