Discovery of Cluster-Scale Lensed Quasars using the Subaru Telescope Naohisa Inada （ RIKEN ） M.Oguri, T.Broadhurst, E.Falco et al. Subaru Users’ Meeting 29 － 31 Jan.

S We are carrying out the Sloan Digital Sky Survey QLSSQLS Quasar Lens Search （ SQLS ）. The main purposes of the SQLS are 1 ） constructing a large statistical sample searching quasars lensed by of lensed quasars and 2 ） searching quasars lensed by clusters of galaxies clusters of galaxies, i.e., a new population of lensed quasars. So far we have succeeded in discovering two SDSS J cluster-scale lensed quasars, SDSS J and SDSS J Subaru Telescope SDSS J We used the Subaru Telescope discoveries and further follow-up observations for the discoveries and further follow-up observations of both of them of both of them. # OUTLINE #

Introduction Overview of the SQLS : Gravitationally lensed quasar survey using the SDSS ~50 new lensed quasars data. ~50 new lensed quasars are expected to be discovered from the ~100,000 SDSS quasars. Main Purposes : largest statistical sample 1 ） Constructing a largest statistical sample of lensed quasars to probe dark energy. cluster-scale lensed quasars ２） Discovering cluster-scale lensed quasars to probe dark matter in galaxy clusters. Current Status : 28 lensed quasars We have succeeded in discovering 28 lensed quasars including 2 cluster-scale lensed quasars so far, including 2 cluster-scale lensed quasars. We have completed the first statistical sample from DR3.

Discovery of SDSS J SDSS J SDSS J : first The first （ 1/2 ） cluster-scale lensed quasar.  = 14.6", z source = 1.734, z lens = Subaru Suprime-Cam Keck LRIS existence of the lensing galaxy cluster originate a single source quasar gri-band A B C D

Discovery of SDSS J SDSS J SDSS J : second The second （ 2/2 ） cluster-scale lensed quasar.  = 22.3", z source = 2.197, z lens = Subaru FOCAS VLA existence of lensing galaxy cluster originate a single source quasar A B

Central lensed image of SDSS J A B C D E CE spectroscopically confirmed central odd lensed image!! （ NFW +ρ    < 2.0 ） HST ACS FOCAS

Arcs in the SDSS J field  V between G1 and G2 is more than 2000 km/s FOCAS FOCAS Many arcs are found in the J1029 field We are going to propose service obs for deeper images. ongoing merger ongoing merger of two clusters!?

Summary # References # J1004 discovery : Inada et al. 2003, Nature, 426, 810 ; Oguri et al. 2004, ApJ, 605, 78 J1029 discovery : Inada et al. 2006, ApJ, L97 J1004 central image : Inada et al. 2005, PASJ, 57, L7 ; Inada et al. in preparation J1029 follow-up : Oguri et al. ApJL submitted We discovered two cluster-scale lensed quasars, SDSS J and SDSS J using the Subaru Telescope. Further follow-up observations with Subaru : We spectroscopically confirmed the central lensed image of J1004, and we may find J1029 to be more interesting （ important ） than J1004.