Discovery of Cluster-ScaleDiscovery of Cluster-ScaleLensed Quasars using the Lensed Quasars using the
Subaru TelescopeSubaru Telescope
Naohisa InadaNaohisa Inada (( RIKENRIKEN ))M.Oguri, T.Broadhurst, E.Falco et al.
Subaru Users’ Meeting29 - 31 Jan. 2008 @NAOJ
We are carrying out the SSloan Digital Sky Survey QQuasar LLens SSearch ( SQLSSQLS ) . The main purposes of the SQLS are 1 ) constructing a large statistical sample of lensed quasars and 2 ) searching quasars lensed by searching quasars lensed by clusters of galaxiesclusters of galaxies, i.e., a new population of lensed quasars. So far we have succeeded in discovering two cluster-scale lensed quasars, SDSS J1004+4112SDSS J1004+4112 and SDSS J1029+2623SDSS J1029+2623. We used the Subaru TelescopeSubaru Telescopefor the discoveries and further follow-up observations discoveries and further follow-up observations of both of themof both of them.
# OUTLINE #
Introduction
Overview of the SQLS :Overview of the SQLS : Gravitationally lensed quasar survey using the SDSS data. ~50 new lensed quasars~50 new lensed quasars are expected to be discovered from the ~100,000 SDSS quasars.
Main Purposes :Main Purposes :1 ) Constructing a largest statistical samplelargest statistical sample of lensed quasars to probe dark energy.2) Discovering cluster-scale lensed quasarscluster-scale lensed quasars to probe dark matter in galaxy clusters.
Current Status :Current Status :We have succeeded in discovering 28 lensed quasars28 lensed quasarsso far, including 2 cluster-scale lensed quasarsincluding 2 cluster-scale lensed quasars. We have completed the first statistical sample from DR3.
Discovery of SDSS J1004+4112
SDSS J1004+4112SDSS J1004+4112 : The firstfirst ( 1/2 ) cluster-scale lensed quasar. = 14.6", zsource = 1.734, zlens = 0.680
Subaru Suprime-CamSubaru Suprime-Cam Keck LRIS
existence of the lensinggalaxy cluster
originate a single source quasar
gri-band
A
B
C
D
Discovery of SDSS J1029+2623
SDSS J1029+2623SDSS J1029+2623 : The secondsecond ( 2/2 ) cluster-scale lensed quasar. = 22.3", zsource = 2.197, zlens = 0.600
Subaru FOCASSubaru FOCAS VLAexistence of lensing galaxy cluster
originate a single source quasar
A
B
Central lensed image of SDSS J1004+4112
A
B
C
D
E
CE
spectroscopically confirmedcentral odd lensed image!!( NFW +ρ < 2.0 )
HST ACS
FOCASFOCAS
Arcs in the SDSS J1029+2623 field
V between G1 and G2is more than 2000 km/s
FOCASFOCAS
FOCASFOCASMany arcs are found in the J1029 field
We are going to propose service obsfor deeper images.
ongoing mergerongoing merger of two clusters!?
Summary
# References #
J1004 discovery : Inada et al. 2003, Nature, 426, 810 ; Oguri et al. 2004, ApJ, 605, 78J1029 discovery : Inada et al. 2006, ApJ, L97J1004 central image : Inada et al. 2005, PASJ, 57, L7 ; Inada et al. in preparationJ1029 follow-up : Oguri et al. ApJL submitted
• We discovered two cluster-scale lensed quasars, SDSS J1004+4112 and SDSS J1029+2623 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.
Recommended