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J/AJ/131/1            Binary quasars in the SDSS                (Hennawi+, 2006)

Binary quasars in the Sloan Digital Sky Survey: evidence for excess clustering on small scales. Hennawi J.F., Strauss M.A., Oguri M., Inada N., Richards G.T., Pindor B., Schneider D.P., Becker R.H., Gregg M.D., Hall P.B., Johnston D.E., Fan X., Burles S., Schlegel D.J., Gunn J.E., Lupton R.H., Bahcall N.A., Brunner R.J., Brinkmann J. <Astron. J., 131, 1-23 (2006)> =2006AJ....131....1H
ADC_Keywords: QSOs ; Photometry, SDSS Keywords: cosmology: observations - large-scale structure of universe - quasars: general - surveys Abstract: We present a sample of 221 new quasar pairs with proper transverse separations Rprop<1h1Mpc over the redshift range 0.5<z<3.0, discovered from an extensive follow-up campaign to find companions around the Sloan Digital Sky Survey (Cat. VII/243) and 2dF QSO Redshift Survey (Cat. VII/241) quasars. This sample includes 26 new binary quasars with separations Rprop<50h-1kpc ({thetas}<10"), more than doubling the number of such systems known. We define a statistical sample of binaries selected with homogeneous criteria and compute its selection function, taking into account sources of incompleteness. The first measurement of the quasar correlation function on scales 10h-1kpc<Rprop<400h-1kpc is presented. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 185 36 Binary quasars with separations 3"<Δθ<60" discovered from follow-up observations table3.dat 185 6 Binary quasars with Δθ<3" discovered from lens selection table4.dat 185 179 Binary quasars discovered in overlapping plates and the SDSS +2QZ catalog table8.dat 185 507 Projected pairs of quasars discovered in overlapping plates table9.dat 185 73 Projected pairs of quasars discovered from follow up spectroscopy table10.dat 185 89 Quasar-star pairs discovered from follow up spectroscopy
See also: VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004) VII/243 : SDSS quasar catalog. III. (Schneider+, 2005) Byte-by-byte Description of file: table*.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name1 Quasar A name (1) 17- 31 A15 --- Name2 Quasar B name (1) 33- 37 F5.3 --- z1 Quasar A redshift 39- 43 F5.3 --- z2 ? Quasar B redshift 45- 49 F5.1 arcsec theta Angular separation 51- 55 I5 km/s dV ? Velocity of quasar B relative to A 57- 61 F5.1 kpc r ? Transverse proper separation in h-1kpc 63- 68 F6.1 --- chi2 Color similarity statistic value 70- 71 I2 h RA1.h Hour of Quasar A Right Ascension (J2000) 73- 74 I2 min RA1.m Minute of Quasar A Right Ascension (J2000) 76- 80 F5.2 s RA1.s Second of Quasar A Right Ascension (J2000) 82 A1 --- DE1.- Sign of the Quasar A Declination (J2000) 83- 84 I2 deg DE1.d Degree of Quasar A Declination (J2000) 86- 87 I2 arcmin DE1.m Arcminute of Quasar A Declination (J2000) 89- 92 F4.1 arcsec DE1.s Arcsecond of Quasar A Declination (J2000) 94- 98 F5.2 mag umag1 The Quasar A SDSS u band PSF magnitude (2) 100-104 F5.2 mag gmag1 The Quasar A SDSS g band PSF magnitude (2) 106-110 F5.2 mag rmag1 The Quasar A SDSS r band PSF magnitude (2) 112-116 F5.2 mag imag1 The Quasar A SDSS i band PSF magnitude (2) 118-122 F5.2 mag zmag1 The Quasar A SDSS z band PSF magnitude (2) 124-125 I2 h RA2.h Hour of Quasar B Right Ascension (J2000) 127-128 I2 min RA2.m Minute of Quasar B Right Ascension (J2000) 130-134 F5.2 s RA2.s Second of Quasar B Right Ascension (J2000) 136 A1 --- DE2.- Sign of the Quasar B Declination (J2000) 137-138 I2 deg DE2.d Degree of Quasar B Declination (J2000) 140-141 I2 arcmin DE2.m Arcminute of Quasar B Declination (J2000) 143-146 F4.1 arcsec DE2.s Arcsecond of Quasar B Declination (J2000) 148-152 F5.2 mag umag2 The Quasar B SDSS u band PSF magnitude (2) 154-158 F5.2 mag gmag2 The Quasar B SDSS g band PSF magnitude (2) 160-164 F5.2 mag rmag2 The Quasar B SDSS r band PSF magnitude (2) 166-170 F5.2 mag imag2 The Quasar B SDSS i band PSF magnitude (2) 172-176 F5.2 mag zmag2 The Quasar B SDSS z band PSF magnitude (2) 178-185 A8 --- Sample Selection algorithm used to find the binary
Note (1): Quasars labeled "A" are the members of the SDSS or 2QZ spectroscopic quasar catalog. Quasars discovered from follow up spectroscopy are designated as "B". For pairs discovered from the photometric catalog, "A" designates the brighter of the two quasars. The binary quasar SDSSJ0117+3153 was discovered after this paper was submitted for publication. It is published here for completeness, however it is not used in the clustering analyses discussed in the text. Note (2): Extinction corrected.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 07-Aug-2006
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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