The Sloan Digital Sky Survey Quasar Lens Search
Naohisa Inada （Nara National College of Technology） and the SQLS team（e-mail to: inada@libe.nara-k.ac.jp）
We have completed the Sloan Digital Sky Survey Quasar Lens Search （SQLS）, that is a lensed quasar survey basedon the SDSS-I and –II spectroscopically confirmed quasars （from Early Data Release to Data Release 7）. From the 44
discoveries and 18 identifications of previously known lensed quasars, the SQLS is now recognized as the current
largest lensed quasar survey. In the course of the SQLS, the UH88 telescope is playing an important role, both for thediscoveries and for the detailed follow-up observations of the SQLS lenses. Below we summarize the results obtained
mainly from the uses of the UH88 telescope. We are now continuing the lensed quasar survey using the SDSS-III data.

• Awarded UH88 nights for the SQLS from 2004A:year
2004A
2004B
2005A
2005B
2006A
2006B
2007A
2007B

instrument
UH8k
UH8k
QUIRC
WFGS2
WFGS2
Optic
WFGS2
Optic→tek2k
WFGS2
WFGS2
Tek2k
－# of nights22222122111－

condition
unknownunknown
unknown○、○○、○○
×、○○、○○○○－PSF subtracted

SDSSJ1320+1644; lensed bya galaxy group with  = 8.6,although the possibility of a binary
quasar cannot be fully excluded.

2008B
2009A

2009B
2010
2011

instrument
Tek2k
WFGS2
Tek2k
WFGS2
Tek2k
WFGS2
Tek2k
Tek2k
WFGS2
Tek2k

# of nights
23
2
1
3
2
2
2
3
2

condition
○、×
△、○、○
△、○
○
×、×、○○、×
○、○
○、○
△、△、△
×、×

40 nights in total !
• References:• Recently discovered lenses:

PSF+G subtracted

year2008A

PSF+G subtracted

SDSSJ1334+3315; a two-image
lensed quasar with  = 0.8.
The lensing hypothesis isconfirmed by LGS+AO188 ofthe Subaru telescope.

• Constraints on Cosmological Parameters:
From our extensive follow-up observations using the UH88 andother telescopes, we are constructing statistical samples oflensed quasars. We use the 19 lensed quasars from the SDSS
DR7 （50,826 quasars）, for the final statistical analysis.
Again, the SQLS represents the current largest statistical lenssample, in terms of both the numbers of source quasars andlenses. By comparing the observed abundance of lenses withtheoretical expectations, we obtain constraints on cosmologicalparameters, to be+0.22+0.17
w = 1.44
0.25（stat.）0.18（syst.）
m = 0.25+0.030.03（stat.） +0.030.02（syst.）
See Oguri et al. 2012 AJ 143 120 for more details.

See the following papers for more details.
Oguri et al. 2012 AJ 143 120; SDSS Quasar Lens Search VI
Inada et al. 2012 AJ 143 119; SDSS Quasar Lens Search V
Inada et al. 2010 AJ 140 403; SDSS Quasar Lens Search IV
Oguri et al. 2008 AJ 135 512; SDSS Quasar Lens Search III
Inada et al. 2008 AJ 135 496; SDSS Quasar Lens Search II
Oguri et al. 2006 AJ 132 999; SDSS Quasar Lens Search IRusu et al. 2013 ApJ 765 139; SDSSJ1320+1644
Rusu et al. 2011 ApJ 738 30; SDSSJ1334+3315
McGreer et al. 2010 AJ 140 370; current most distant lens QSOKayo et al. 2010 AJ 139 1614; discovery of 8 new lenses
Inada et al. 2009 AJ 137 4118; discovery of 5 new lenses
Oguri et al. 2008 MNRAS 391 1973; SDSSJ1330+1810+ more than 10 papers!

↑ Our statistical sample
of 19 lensed quasars. .
→ Constraints on cosmologicalparameters under dark energy model,
combining with the SDSS BAO result.