Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...95..401p&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 95, no. 2, p. 401-412
Astronomy and Astrophysics
Astrophysics
52
Astronomical Catalogs, Astronomical Maps, Astronomical Models, Galactic Clusters, Galactic Structure, Alignment, Frequency Distribution, Mathematical Models
Scientific paper
The position angles of a large number of Abell and Shectman clusters, identified in the Lick map as surface galaxy-density enhancements, are estimated. I determine the major axis orientation of a total of 637 clusters, of which 448 are Shectman clusters (202 of which are also Abell clusters) and 189 are Abell clusters not originally detected by Shectman due to his adopted density threshold. Using published redshifts for 277 of these clusters I have detected strong nearest neighbor alignments over scales up to approximately 15/h Mpc at a greater than or approximately = 2.5 - 3 sigma significance level, while quite weak alignments are detected even up to approximately 60/h Mpc. A more significant alignment signal (approximately = 4 sigma) is detected among all neighbors residing in superclusters and having separations less than or approximately = 10/h Mpc. Again, weaker but significant alignments are found when larger separations are considered. Since my cluster sample is neither volume limited nor redshift complete (which would have tended to wash out any real alignment signal), the alignments detected should reflect a real and possibly a stronger underline effect.
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