Statistics – Computation
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..291w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 291-302.
Statistics
Computation
51
Alignment, Computational Astrophysics, Galactic Clusters, Astronomical Models, Density Distribution, Interacting Galaxies, Monte Carlo Method, Red Shift
Scientific paper
A static semianalytical derivation is presented of the frequency of chance occurrence of isolated subgroups within groups of galaxies. It is shown that contamination by interlopers has a small effect on the frequency of isolated subgroups but explains the relatively large fraction of discordant redshifts in Hickson's (1982) compact groups. The high frequencies of chance alignments found in earlier dynamical simulations of groups are confirmed, and it is found that the typical NBG group contributes enough to produce, by chance alignments of galaxies, compact groups strictly meeting Hickson's selection criteria. However, the typical NBG group contributes negligibly to the production of compact groups as compact as Hickson's chance alignments. It is shown that a few loss groups, as well as small clusters and the Virgo cluster, contribute disproportionately more than the typical NBG group. Binaries are shown to be important in NBG groups.
Mamon Gary A.
Walke D. G.
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