演講資訊

摘要：

Gravitationally lensed quasars are valuable astronomical objects that offer unique opportunities for studying galaxy evolution and cosmology. Current and upcoming imaging surveys will contain thousands of new lensed quasars, augmenting the existing sample by an order of magnitude. We report the discovery of new lensed quasars (or candidates) in the HSC and CFIS surveys. The HSC covers 1400 square degrees with grizy bands, while the CFIS covers 2500 square degrees with ur bands. After the preselection of quasar sources using the existing catalogs or color cuts, we search for the presence of multiple point sources with similar color through the convolution of the Laplacian of the preselected quasar image cutouts with the Laplacian of the point spread function. We conduct a multiple phase visual inspection to grade our systems, resulting ~100 new lens quasar candidates. Spectroscopic or high-resolution imaging follow up on these newly discovered lensed quasar candidates will further allow their natures to be confirmed.