Linear Clusters of Galaxies: A999 and A1016
Abstract
The authors have measured 44 new redshifts in A 999 and 40 in A 1016: these clusters are both "linear" according to Rood and Sastry (1971) and Struble and Rood (1982, 1984). With 20 cluster members in A 999 and 22 in A 1016, the authors can estimate the probability that these clusters are actually drawn from spherically symmetric distributions. By comparing the clusters with Monte Carlo King models, they find that A 999 is probably intrinsically spherically symmetric, but A 1016 is probably linear. The authors estimate that ⪆2% of a catalog of spherically symmetric clusters might be erroneously classified as linear. They use the data to estimate the virial masses for these systems. The authors reassess the clustergalaxy alignment analysis of Adams, Strom, and Strom (1980) and examine the relationship between the luminosity and morphological type of the cluster members and the cluster itself.
 Publication:

The Astronomical Journal
 Pub Date:
 September 1987
 DOI:
 10.1086/114493
 Bibcode:
 1987AJ.....94..571C
 Keywords:

 Galactic Clusters;
 Galactic Evolution;
 Galactic Mass;
 Mass To Light Ratios;
 Red Shift;
 X Ray Astronomy;
 Anisotropy;
 Computational Astrophysics;
 Elliptical Galaxies;
 Line Of Sight;
 Statistical Tests;
 Virial Theorem;
 Astrophysics;
 GALAXIES: CLUSTERING