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The Sloan Digital Sky Survey Quasar Catalog. V. Seventh Data Release

  • Authors: Donald P. Schneider, Gordon T. Richards, Patrick B. Hall, Michael A. Strauss, Scott F. Anderson, Todd A. Boroson, Nicholas P. Ross, Yue Shen, W. N. Brandt, Xiaohui Fan, Naohisa Inada, Sebastian Jester, G. R. Knapp, Coleman M. Krawczyk, Anirudda R. Thakar, Daniel E. Vanden Berk, Wolfgang Voges, Brian Yanny, Donald G. York, Neta A. Bahcall, Dmitry Bizyaev, Michael R. Blanton, Howard Brewington, J. Brinkmann, Daniel Eisenstein, Joshua A. Frieman, Masataka Fukugita, Jim Gray, James E. Gunn, Pascale Hibon, Željko Ivezić, Stephen M. Kent, Richard G. Kron, Myung Gyoon Lee, Robert H. Lupton, Elena Malanushenko, Viktor Malanushenko, Dan Oravetz, K. Pan, Jeffrey R. Pier, Ted N. Price III, David H. Saxe, David J. Schlegel, Audry Simmons, Stephanie A. Snedden, Mark U. SubbaRao, Alexander S. Szalay, and David H. Weinberg

SCHNEIDER et al. 2010 The Astronomical Journal 139 2360.

  • Provider: AAS Journals

Caption: Figure 5.

Four panels display the distributions of the catalog quasars in redshift, observed i magnitude, Δ( gi), and absolute magnitude. The two left panels have bin sizes of 0.1; the two panels on the right have magnitude intervals of 0.25. Logarithmic scales have been adopted because of the enormous dynamic range in all of the histograms. If there are zero points in a bin, the logarithm of the counts is set to −0.3 (horizontal lines in each panel). The redshifts range from 0.065 to 5.46. The dips at redshifts of 2.7 and 3.5 are caused by the reduced completeness of the selection algorithm at these redshifts. The i magnitude in the upper right panel is not corrected for Galactic absorption. The sharp drop that occurs at magnitudes slightly fainter than 19 is due to the flux limit for the low-redshift targeted part of the survey. The SDSS Quasar survey has a bright limit of i ≈ 15.0 imposed by the need to avoid saturation in the spectroscopic observations. The distribution of the Δ( gi) colors shows strong asymmetry, with a tail of objects extending to the red.

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