The Symmetry, Color, and Morphology of Galaxies

Details The Symmetry, Color, and Morphology of Galaxies The Symmetry, Color, and Morphology of Galaxies

1997-10-22

arxiv.org/abs/astro-ph/9710234v1

Astronomy and Astrophysics

Astrophysics

Accepted for Publication in PASP; five figures

Scientific paper

10.1086/134004

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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