Spectral Classification of Galaxies with z ≲ 0.5

Using the ESO-Sculptor faint galaxy redshift survey data, we have extensively tested the Principal Component Analysis (PCA) method to perform the spectral classification of galaxies with z ≲ 0.5. This method allows us to separate all galaxies in an ordered and continuous spectral sequence, which is strongly correlated with the Hubble type. The PCA method works independently of any set of templates, and can also unveil the activity and abnormal spectral features of the sample of galaxy spectra. We study the stability of the approach on the full redshift catalogue in order to search for possible relationships between spectral type, activity and redshift.