The search and investigation of the Large Groups of Quasars

@article{Komberg1996TheSA,
  title={The search and investigation of the Large Groups of Quasars},
  author={B. Komberg and A. Kravtsov and Vladimir N. Lukash Astro Space Center and Moscow and N. University},
  journal={arXiv: Astrophysics},
  year={1996}
}
Recently, it was suggested that large concentrations or groups of quasars may trace sites of enhanced matter density at medium and high redshifts analogous to how galaxy clusters trace them in nearby space. We have checked existing quasar data for the presence of such groups. Large Quasar Groups (LQGs) were identified using a well-known cluster analysis technique. Our final list consists of 12 groups, including one reported previously. Most of the quasars in these groups come from deep… Expand
9 Citations

Tables from this paper

LARGE SDSS QUASAR GROUPS AND THEIR STATISTICAL SIGNIFICANCE
We use a volume-limited sample of quasars in the Sloan Digital Sky Survey (SDSS) DR7 quasar catalog to identify quasar groups and address their statistical significance. This quasar sample has aExpand
Detection of the first X-ray selected large AGN group
We have examined the spatial distribution of 856 AGN detected by the ROSAT All-Sky Survey (RASS) using a direct search for structures with the minimal spanning tree. The AGNs were compiled from anExpand
Tracing high redshift cosmic web with quasar systems
  • M. Einasto
  • Physics
  • Proceedings of the International Astronomical Union
  • 2014
Abstract We study the cosmic web at redshifts 1.0 ≤ ≤ 1.8 using quasar systems based on quasar data from the SDSS DR7 QSO catalogue. Quasar systems were determined with a friend-of-friend (FoF)Expand
Tracing a high redshift cosmic web with quasar systems
We study the cosmic web at redshifts 1.0 z 1.8 using quasar systems based on quasar data from the SDSS DR7 QSO catalogue. Quasar systems were determined with a friendof-friend (FoF) algorithm at aExpand
Investigation of homogeneity and matter distribution on large scales using large quasar groups
We use 12 large quasar group (LQG) samples to investigate the homogeneity of $0.5\lesssim z \lesssim 2$ Universe ($z$ denotes the redshift). We calculate the bias factor $b$ and the two-pointExpand
An I-Band-Selected Sample of Radio-Emitting Quasars: Evidence for a Large Population of Red Quasars
We present a new sample of 35 quasars selected from the FIRST radio survey and the Deeprange I-band survey (Postman et al. 1998, 2002). A comparison with the FIRST Bright Quasar survey samplesExpand
Large-scale fluctuations in the number density of galaxies in independent surveys of deep fields
New arguments supporting the reality of large-scale fluctuations in the density of the visible matter in deep galaxy surveys are presented. A statistical analysis of the radial distributions ofExpand
A giant ring-like structure at 0.78
According to the cosmological principle, Universal large-scale structure is homogeneous and isotropic. The observable Universe, however, shows complex structures even on very large scales. The recentExpand
List, the Structure, and Chemistry of Neutrinium Elements of Light Matter
Light Matter (LM) is a substance composed of light nuclei of neutrinium (NN) with a mass of 1 to several tens of MeV. It is assumed that neutrinos are able to form short-lived Cooper pairs, some ofExpand

References

SHOWING 1-10 OF 23 REFERENCES
The Space Distribution of Quasars
Article de synthese traitant des techniques d'observation et de la fonction de luminosite des quasars, ainsi que des associations quasar-galaxie et quasar-quasar
Astrophys. J
  • Astrophys. J
  • 1993
Astron. J
  • Astron. J
  • 1991
Astrophys. J. Suppl
  • Astrophys. J. Suppl
  • 1991
Catalogue of Quasars and Active Nuclei, ESO Sci. Rep. N10
  • Catalogue of Quasars and Active Nuclei, ESO Sci. Rep. N10
  • 1991
The Space Distribution of Quasars, ASP Conf. Ser
  • The Space Distribution of Quasars, ASP Conf. Ser
  • 1991
Astron.J
  • Astron.J
  • 1994
Astronomy & Astrophys
  • Astronomy & Astrophys
  • 1994
Astrophys.J.Lett
  • Astrophys.J.Lett
  • 1993
Astronomy & Astrophys
  • Astronomy & Astrophys
  • 1992
...
1
2
3
...