/ftp/cats/J/ApJ/678//635



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J/ApJ/678/635    Spectroscopy of quasar binary candidates         (Myers+, 2008)
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Beginning of ReadMe : J/ApJ/678/635 Spectroscopy of quasar binary candidates (Myers+, 2008) ================================================================================ Quasar clustering at 25 h^-1^ kpc from a complete sample of binaries. Myers A.D., Richards G.T., Brunner R.J., Schneider D.P., Strand N.E., Hall P.B., Blomquist J.A., York D.G. <Astrophys. J., 678, 635-646 (2008)> =2008ApJ...678..635M ================================================================================ ADC_Keywords: Binaries, spectroscopic ; Redshifts ; QSOs Keywords: cosmology: observations - large-scale structure of universe - quasars: general - surveys Abstract: We present spectroscopy of binary quasar candidates, with component separations of 3"<=Deltatheta<6", selected from SDSS DR4 using kernel density estimation (KDE). Of our 27 new quasar pair observations, 10 are binary quasars, which doubles the number of known g<21 binaries with 3"<=Deltatheta<6" separations. Several of our observed binaries are wide-separation lens candidates that merit additional higher resolution spectroscopy, as well as deep imaging to search for lensing galaxies. Our candidates are initially selected by UV excess (u-g<1), but are otherwise selected irrespective of the relative colors of the quasar pair, and we thus use them to suggest optimal color similarity and photometric redshift approaches for targeting binary quasars or projected quasar pairs. We find that a third or more of all binary quasars have quite dissimilar components on the basis of a typical color similarity criterion (chi^2^_color_< 20). From a sample that is complete on proper scales of 23.7h^-1^kpc<R_prop_<29.9h^-1^kpc, we determine the projected quasar correlation function. Description: Spectroscopy of our DR4 KDE binary quasar candidates was obtained with the Ritchey-Chretien Spectrograph on the Mayall 4m telescope at Kitt Peak National Observatory (KPNO) over five nights (UT 2007 February 22-26). We used a 1.5"x98" long slit set at the position angle of the candidate binary, which allowed both components to be simultaneously observed.