Discovery of Cluster-Scale Lensed Quasars using the Subaru Telescope

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Discovery of Cluster-ScaleLensed Quasars using
the Subaru Telescope
Naohisa Inada (RIKEN) M.Oguri, T.Broadhurst,
E.Falco et al.
Subaru Users Meeting 29-31 Jan. 2008 _at_NAOJ
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OUTLINE
We are carrying out the Sloan Digital Sky Survey
Quasar Lens Search (SQLS). The main purposes of
the SQLS are 1) constructing a large statistical
sample of lensed quasars and 2) searching
quasars lensed by clusters of galaxies, i.e., a
new population of lensed quasars. So far we have
succeeded in discovering two cluster-scale
lensed quasars, SDSS J10044112 and SDSS
J10292623. We used the Subaru Telescope for the
discoveries and further follow-up observations
of both of them.
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Introduction
Overview of the SQLS Gravitationally lensed
quasar survey using the SDSS data. 50 new
lensed quasars are expected to be discovered
from the 100,000 SDSS quasars.
Main Purposes 1) Constructing a largest
statistical sample of lensed quasars to
probe dark energy. 2) Discovering cluster-scale
lensed quasars to probe dark matter in
galaxy clusters.
Current Status We have succeeded in discovering
28 lensed quasars so far, including 2
cluster-scale lensed quasars. We have completed
the first statistical sample from DR3.
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Discovery of SDSS J10044112
SDSS J10044112 The first (1/2) cluster-scale
lensed quasar. ?? 14.6", zsource 1.734,
zlens 0.680
D
B
A
C
gri-band
Subaru Suprime-Cam
Keck LRIS
originate a single source quasar
existence of the lensing galaxy cluster
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Discovery of SDSS J10292623
SDSS J10292623 The second (2/2) cluster-scale
lensed quasar. ?? 22.3", zsource 2.197,
zlens 0.600
B
A
Subaru FOCAS
VLA
existence of lensing galaxy cluster
originate a single source quasar
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Central lensed image of SDSS J10044112
E
D
B
A
C
E
C
HST ACS
spectroscopically confirmed central odd lensed
image!! (NFW ??? ? ? lt 2.0)
FOCAS
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Arcs in the SDSS J10292623 field
FOCAS
Many arcs are found in the J1029 field
FOCAS
?V between G1 and G2 is more than 2000 km/s
We are going to propose service obs for deeper
images.
ongoing merger of two clusters!?
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Summary

• We discovered two cluster-scale lensed quasars,
• SDSS J10044112 and SDSS J10292623 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.

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