Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30..769j&link_type=abstract
American Astronomical Society Meeting, 191, #130.11
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a statistical comparison between spectral line strength variations in Coma galaxies and galaxies in three rich clusters at z ~ 0.3. Using a principal component analysis, we have transformed the observable quantities, the line strengths, into new mutually orthogonal axes and found two specific results. First, more independent parameters are required to account for the line strength variations in the distant cluster data than in the Coma data, and second, line strengths which are not correlated in the distant cluster data are strongly coupled in the Coma data. These results suggest that galaxies in clusters have been homogenized such that most of the information from the conditions present at their formation has been destroyed. Hence, it may be possible that the present day homogeneity of early type galaxy properties, e.g. fundamental plane relations, does not require a single formation scenario, but that a variety of formation scenarios for different galaxies could still yield the observed behaviour of nearby galaxies.
Couch Warrick
Jones Lynne
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