1996/08/18 by Andrey V. Kravtsov, Kravtsov, Andrey V.
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Scientific Research and Discoveries #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9608112
5 pages, 2 figures, LaTeX (uses mn.sty), submitted to MNRAS, also available at http://astro.nmsu.edu/~akravtso/publications.html
arxiv created 1996/08/18 · openalex publication_date 1996/08/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have used integral two-point spatial correlation function and its second derivative to analyze the distribution of quasars in three very deep surveys published in the literature. Statistically significant (∼ 2-3σ) correlations were found at scales of ∼ 50-100h-1 Mpc in all of the analyzed surveys. We have used the friends-of-friends cluster analysis to show that these correlations can be explained by the presence of relatively small quasar clusters (3-6 objects) which may possibly belong to larger structures such as Large Quasar Groups found in the bigger surveys. The sizes of these clusters along the redshift direction and distances between them are similar to those for structures found recently in studies of CIV absorption systems. These results present further evidence for the existence of large-scale structures at redshifts z∼ 1-2.