Task: Text Categorization
Input (English): Code and Welch first observed the kind of these structures that emit ultraviolet radiation, challenging popular opinion that they would be dark in that part of the spectrum. Their metallicity is given by the magnesium-sigma relation. Isophotes that describe these structures may feature a twist in them, or a boxy appearance. AGNs that emit radio waves are typically found within these structures, one example of which is M87. They have their surface intensity related to empirical distance via de Vaucouleurs' law. An empirical law modeling the luminosity of these structures is derived from the fundamental plane relation and states that the luminosity is equal to the fourth power of the velocity dispersion, which is known as the FaberJackson relation. For 10 points, identify these galaxies named for their oblate shape.
Output (English): Science