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J/AJ/135/496        SDSS quasar lens search. II.                  (Inada+, 2008)

The Sloan Digital Sky Survey quasar lens search. II. Statistical lens sample from the third Data Release. Inada N., Oguri M., Becker R.H., Shin M.-S., Richards G.T., Hennawi J.F., White R.L., Pindor B., Strauss M.A., Kochanek C.S., Johnston D.E., Gregg M.D., Kayo I., Eisenstein D., Hall P.B., Castander F.J., Clocchiatti A., Anderson S.F., Schneider D.P., York D.G., Lupton R., Chiu K., Kawano Y., Scranton R., Frieman J.A., Keeton C.R., Morokuma T., Rix H.-W., Turner E.L., Burles S., Brunner R.J., Sheldon E.S., Bahcall N.A., Masataka F. <Astron. J., 135, 496-511 (2008)> =2008AJ....135..496I
ADC_Keywords: QSOs ; Gravitational lensing ; Photometry, SDSS Keywords: cosmology: observations - gravitational lensing - quasars: general Abstract: We report the first results of our systematic search for strongly lensed quasars using the spectroscopically confirmed quasars in the Sloan Digital Sky Survey (SDSS). Among 46420 quasars from the SDSS Data Release 3 (∼4188deg2), we select a subsample of 22683 quasars that are located at redshifts between 0.6 and 2.2 and are brighter than the Galactic extinction-corrected i-band magnitude of 19.1. We identify 220 lens candidates from the quasar subsample, for which we conduct extensive and systematic follow-up observations in optical and near-infrared wavebands, in order to construct a complete lensed quasar sample at image separations between 1" and 20" and flux ratios of faint to bright lensed images larger than 10-0.5. We construct a statistical sample of 11 lensed quasars. Ten of these are galaxy-scale lenses with small image separations (∼1"-2") and one is a large separation (15") system which is produced by a massive cluster of galaxies, representing the first statistical sample of lensed quasars including both galaxy- and cluster-scale lenses. The Data Release 3 spectroscopic quasars contain an additional 11 lensed quasars outside the statistical sample. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 127 90 Morphological lens candidates table3.dat 127 262 Color lens candidates table4.dat 120 11 Lensed quasars from the SDSS DR3: statistical sample table5.dat 120 11 Additional lensed quasars in the SDSS DR3 quasar catalog table6.dat 40 22683 Redshifts and Galactic extinction corrected i-band magnitudes of the 22683 quasars refs.dat 91 29 References
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) VII/243 : SDSS quasar catalog. III. (Schneider+, 2005) J/AJ/132/999 : SDSS quasar lens search (Oguri+, 2006) : SDSS Home Page Byte-by-byte Description of file: table[23].dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [SDSS] 6- 24 A19 --- SDSS Object name ( 26 A1 --- f_z [(] Indicates a redshift from follow-up observations 27- 31 F5.3 --- z ? Redshift (from the SDSS DR3 quasar catalog) 33- 37 F5.2 mag imag i-band PSF magnitudes with Galactic extinction correction from the SDSS DR3 quasar catalog. 39- 43 F5.2 arcsec theta ? Image separations between two components from the SDSS imaging data (1) 45- 48 F4.2 mag Dimag ? Magnitude differences (Deltai) between the expected two components, only in table2 (1) 50- 79 A30 --- Image Instruments (and filters) used for the follow-up imaging (2) 82- 88 A7 --- Spec Instruments (and filters) used for the follow-up spectroscopy (2) 90-121 A32 --- Com Comments 123-127 A5 --- r_SDSS References, in refs.dat file
Note (1): Derived from fitting the SDSS i-band image with two PSFs using GALFIT. Note (2): Instruments used for the follow-up observations, defined as follows: 8k = UH8k at UH88 QU = QUIRC at UH88 Op = Optic at UH88 WF = WFGS2 at UH88 Te = Tek2048 at UH88 SP = SPIcam at ARC 3.5m NR = NIRC at Keck UF = UFTI at UKIRT SC = Suprime-Cam at Subaru DA = DIS III at ARC 3.5m LR = LRIS at Keck EF = EFOSC2 at ESO 3.6m MS = MMT spectrograph
Byte-by-byte Description of file: table[45].dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [SDSS] 6- 15 A10 --- Name Object designation (JHHMM+DDMM) 17 I1 --- Nimg Number of lenses 19- 23 F5.3 --- z Redshifts from follow-up observations 25- 29 F5.2 arcsec theta Maximum image separations 31- 34 F4.2 --- fiI Flux ratios in the I- or i-band images (1) 36- 60 A25 --- Comm Comment 62- 86 A25 --- Reject Reason that each lens is excluded from the statistical sample (only for table 5) 88- 95 A8 --- r_SDSS Reference(s); see refs.dat file 97-100 A4 --- --- [SDSS] 102-120 A19 --- SDSS SDSS name ( (not part of the original data, added by CDS) (2)
Note (1): Flux ratios between the brightest lensed image and the farthest lensed image from the brightest image, in the I- or i-band images. Note (2): In col. Comm, SBS 0909+523 is a misprint for SBS 0909+532 and has been corrected here.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [SDSS] 5- 23 A19 --- SDSS Source identification ( 25- 31 F7.5 --- z Redshift 33- 40 F8.5 mag imag Galactic extinction corrected i-band magnitude
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- Bibcode BibCode 24- 38 A15 --- Aut Author's name 40- 91 A52 --- Com Comments
History: From electronic version of the journal References: Oguri et al., Paper I 2006AJ....132..999O, Cat. J/AJ/132/999 Oguri et al., Paper III 2008AJ....135..512O Kayo et al., Paper IV 2010AJ....139.1614K
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 08-Dec-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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