Fig. 1 from Binary Quasars in the Sloan Digital Sky Survey: Evidence for Excess Clustering on Small Scales

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Binary Quasars in the Sloan Digital Sky Survey: Evidence for Excess Clustering on Small Scales

Authors: Joseph F. Hennawi, Michael A. Strauss, Masamune Oguri, Naohisa Inada, Gordon T. Richards, Bartosz Pindor, Donald P. Schneider, Robert H. Becker, Michael D. Gregg, Patrick B. Hall, David E. Johnston, Xiaohui Fan, Scott Burles, David J. Schlegel, James E. Gunn, Robert H. Lupton, Neta A. Bahcall, Robert J. Brunner, and Jon Brinkmann

Hennawi et al. 2006 The Astronomical Journal 131 1.

Provider: AAS Journals

Caption: Fig. 1.

Histogram of the χ² color similarity statistic (see eq. [2]) values for 64,621 unique pair combinations of 359 quasars in the SDSS sample in the narrow redshift interval ﹩2.4< z< 2.45﹩. Although the quasars are all at nearly the same redshift, ﹩z\simeq 2.4﹩, the dispersion in the color‐redshift relation of quasars (Richards et al. 2001a) results in a broad distribution. The median value is 33.1, so that a quasar pair survey that aims to achieve 50% completeness for ﹩z\simeq 2.4﹩ quasars would have to observe all quasar pair candidates with ﹩\chi ^{2}< 33.1﹩.

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