Automatic Unsupervised Classification of All Sloan Digital Sky Survey Data Release 7 Galaxy Spectra

Using the k-means cluster analysis algorithm, we carry out an unsupervised classification of all galaxy spectra in the seventh and final Sloan Digital Sky Survey data release (SDSS/DR7). Except for the shift to rest-frame wavelengths and the normalization to the g-band flux, no manipulation is appli...

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