Group Analysis Reveals Previously Unrecognized Patterns in Stellar and Galactic Distributions

Details Group Analysis Reveals Previously Unrecognized Patterns in Stellar and Galactic Distributions Group Analysis Reveals Previously Unrecognized Patterns in Stellar and Galactic Distributions

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7721m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #77.21; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

As a novel approach to discover groups in the distribution of nearby stars and galaxies, group analysis, a monothetic divisive clustering method, was applied to stars from the NStars database and the Gliese 3 Star Catalogue, and to galaxies from the Tully Collection. Groups were identified based on position, type, and proper motion. The group coefficient, a measure of significance, was calculated for each group. The groups identified all have a high group coefficient showing that the distribution is not homogenous or random. It was discovered that the cool M type star tends to associate with warmer stars. It was also found that the majority of the stars travel clockwise around the galaxy’s center while the rest do not follow the pattern. Prominent groups in the distribution of galaxies were identified as well: elliptical galaxies were found to associate with spiral galaxies with little star formation. However when elliptical galaxies are absent, groups tended to associate with irregular and spiral galaxies with middle-level star formation. This work has demonstrated that group analysis is a useful new tool for understanding patterns in distributions. It has provided a more detailed description of the structure of nearby space and its underlying correlations.

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