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The Symmetry, Color, and Morphology of Galaxies

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arxiv astro-ph/9710234 v1 pith:XTUZYDGJ submitted 1997-10-22 astro-ph

The Symmetry, Color, and Morphology of Galaxies

classification astro-ph
keywords symmetrycolorfoundgalaxymorphologicalparameterstructuralabsolute
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The structural symmetry of forty-three face-on galaxy images in the R(65 0 nm) and J(450 nm) bands are measured to determine the usefulness of symmetry a s a morphological parameter. Each galaxy image is rotated by $180$\deg and subtr acted from the original to obtain a quantitative value for its structural symmet ry. The symmetry numbers computed for the sample are then compared with RC3 mor phological types, color \& absolute blue magnitudes. A strong correlation betw een color and symmetry is found, and the RC3 Hubble sequence is found to be one of increasing asymmetry. The use of symmetry as a morphological parameter, and the possible causes of the asymmetries are discussed.

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  1. Performance of morphological classifiers for galaxy mergers compared to current machine learning methods

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    Updated G-M20 and G-C morphological cuts achieve ~70% merger precision comparable to ML, with better high-z robustness, but only select pre-mergers.