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Seminários de Astronomia: Morfometryka: principles and applications — Fabricio Ferrari (FURG)
18 de julho de 2017:12:30 - 13:30
Morphology is a result of galaxy formation, evolution and interaction with neighbors. The relationship between galaxy morphology and other properties can help us infer how galaxies acquired the properties that we observe today. The traditional method of classification based on visual inspection of images by experts is deficient, for several reasons: it is very subjective expert-dependent method; it does not capture the morphological subtleties; it cannot be applied to large datasets. Here we plan to use Morfometryka (Ferrari et al. 2015) – an algorithm designed to measure structural parameters for an extended morphometric system (Concentration, Asymmetry, Smoothness, Gini, M20, Spirality and Entropy) to investigate galaxy morphometry. A supervised classification method can help to assign each new galaxy a probability of being elliptical or spiral. In this way, we can investigate how the morphometric parameters are related to other structural parameters of galaxies and how they vary with redshift, providing us with clues about how they formed and evolved.