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• W2012912641 abstract "We describe application of the shapelet linear decomposition of galaxy images to morphological classification using images of ∼3000 galaxies from the Sloan Digital Sky Survey. After decomposing the galaxies, we perform a principal component analysis to reduce the number of dimensions of the shapelet space to nine. We find that each of these nine principal components contains unique morphological information and give a description of each principal component's contribution to a galaxy's morphology. We find that galaxies of differing Hubble type separate cleanly in the shapelet space. We apply a Gaussian mixture model to the nine-dimensional space spanned by the principal components and use the results as a basis for classification. Using the mixture model, we separate galaxies into seven classes and give a description of each class' physical and morphological properties. We find that several of the mixture model classes correlate well with the traditional Hubble types both in their morphology and their physical parameters (e.g., color, velocity dispersions, etc.). In addition, we find an additional class of late-type morphology but with high velocity dispersions and very blue color; most of these galaxies exhibit poststarburst activity. This method provides an objective and quantitative alternative to traditional and subjective visual classification." @default.
• W2012912641 created "2016-06-24" @default.
• W2012912641 creator A5060700578 @default.
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• W2012912641 date "2004-02-01" @default.
• W2012912641 modified "2023-10-18" @default.
• W2012912641 title "Morphological Classification of Galaxies by Shapelet Decomposition in the Sloan Digital Sky Survey" @default.
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• W2012912641 doi "https://doi.org/10.1086/380934" @default.
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