The search for and investigation of large quasar groups

Details The search for and investigation of large quasar groups The search for and investigation of large quasar groups

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.282..713k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 282, Issue 3, pp. 713-722.

Astronomy and Astrophysics

Astronomy

24

Quasars: General, Large-Scale Structure Of Universe

Scientific paper

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 the way in which galaxy clusters trace them in nearby space. We checked existing quasar data for the presence of such groups. Large quasar groups (LQGs) were identified using a well-known cluster analysis technique and the following selection criteria: (i) an LQG must contain at least 10 quasars; (ii) the number density of quasars in a group must exceed that of the background by at least a factor of 2; (iii) the majority of quasars in a group must have reliable redshifts. Our final list contains 12 such groups, including one reported previously. It was found that most of the quasars in these groups come from deep homogeneous surveys. Further analysis of the spatial distribution of quasars in these surveys shows that: (i) the probability that the detected groups are random is rather small (generally a few per cent); (ii) their sizes range from ~70 to ~160 h^-1 Mpc, which is comparable to the sizes of nearby rich superclusters; (iii) the detected groups all have redshifts 0.5

Affiliated with

Also associated with

No associations

Rating

The search for and investigation of large quasar groups does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The search for and investigation of large quasar groups, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The search for and investigation of large quasar groups will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1137530