Abstract
Astronomers who use massive data sets tend to eschew the morphological
classification of galaxies in favor of classification based on
easier-to-measure, more objective physical quantities. However, many
astronomers who study detailed properties of galaxies, such as
spatially resolved spectroscopy, stellar populations, and
star-formation, are still using morphology as a classifier. I review
our current understanding of the relationship between morphological
classification, physical properties, and galaxy environment. I
conclude that the currently used classification of galaxies by their
physical quantities omits information that classical morphology
captures. However, I argue that to take classical morphology
seriously it must be put onto a more objective and quantitative basis
than it currently is.