| Abstract: |
I will describe a campaign of imaging observations of the gravitationally lensed quasars from the SDSS, using the Subaru Telescope Adaptive Optics (IRCS+AO188). Eighteen lensed quasars and two lensed quasar candidates were observed for ~20 minutes each, mostly in the laser guide star mode. The sample consists mostly of doubles, and one quad. The purpose of the campaign was to obtain accurate relative astrometry, photometry and lens shapes for each system, reveal detail unseen in the previous low-resolution data, and constrain accurate mass models. Due to weather variability and low Strehl ratios ~10%, the separately-observed stars did not provide an accurately enough PSF. As a result, an analytical or a hybrid PSF was built using the information provided by the targets themselves. For 4 systems, quasar host galaxies were also detected. I will describe the observations, data analysis, present new results on selected systems such as J1405+0959, and show how the data compares with HST observations of similar systems. |
