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Paper: Clustering of Identical Quasars in the SDSS First Data Release
Volume: 311, AGN Physics with the Sloan Digital Sky Survey
Page: 467
Authors: Trump, J.R.; Schneider, D.P.; Richards, G.T.
Abstract: We discuss sets of "identical" clustered quasars from the Sloan Digital Sky Survey First Data Release at comoving separations up to 200 h−1Mpc (in a cosmology with ΩM = 0.3 and ΩΛ = 0.7). The components of each set have nearly identical redshifts, colors, and spectra. While most of the comparisons were two-point, several identical triplets were also identified. Statistical analyses show that the amount of spectral similarity in quasars pairs within 110 h−1Mpc exceeds the expected similarity from a randomly distributed set of quasars. The high degree of exhibited spectral similarity is unlikely to be due to gravitational lensing at such wide separations.
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