Poster Presentation
Is the dichotomy among early-type galaxies real?
Presenter: Rogerio Monteiro-oliveira (ASIAA)
Early-type galaxies are believed to consist of two groups with
distinct properties. For the group occupying the luminous end, their
isophotes are boxy-shaped and their kinematics are consistent with
being slow or no rotation. The other group, on the other hand,
consists of less luminous galaxies, and are disk-dominated, and fast
rotators. However, such an apparent dichotomy was based only on
relatively small samples.
Using a large sample of early-type galaxies observed by the MaNGA
survey, which has been classified via a deep learning code and further visually confirmed by Galaxy Zoo 2 project, we investigated the existence of the dichotomy in the galaxy properties. For this, we
accurately measured their isophotes and kinematics. We also determined their chemical composition ([Mg/Fe]) and velocity dispersion to check for any additional dependence. We found no evidence that early-type galaxies can be divided into two distinct groups. This suggests that their formation process may be more complex, involving several evolutionary paths.
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