![]() ![]() The survey contains images and parameters of roughly 287 million objects over 9583 deg^2, and 1.27 million spectra of stars, galaxies, quasars and blank sky (for sky subtraction) selected over 7425 deg^2. With the Sixth Data Release of the Sloan Digital Sky Survey, the imaging of the Northern Galactic Cap is now complete. Finally, we report on three interesting variable quasars, including variability confirmation of the BL Lac candidate PKS 1222+037. The establishment of statistically robust trends and efficient, non-spectroscopic selection algorithms will aid in quasar identification and categorization in upcoming massive synoptic surveys. ![]() Using already-known quasars as a template, we introduce a light curve morphology algorithm that provides an efficient method for discriminating variable quasars from periodic variable objects in the absence of spectroscopic information. Our comparison of variability likelihood to radio, IR, and X-ray data is consistent with earlier quasar studies. In a time-limited synoptic survey, we detect an anti-correlation between redshift and the likelihood of variability. ![]() These quasars are grouped into variable and non-variable populations based on measured variability confidence levels. We present variability and multi-wavelength photometric information for the 933 known quasars in the QUEST Variability Survey. ![]()
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