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The Symmetry, Color, and Morphology of Galaxies

Christopher J. Conselice
Publications of the Astronomical Society of the Pacific
Vol. 109, No. 741 (1997 November), pp. 1251-1255
Stable URL: http://www.jstor.org/stable/40681030
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Symmetry, Color, and Morphology of Galaxies
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Abstract

The structural symmetry of 43 face-on galaxy images in the R (650 nm) and J (450 nm) bands are measured to determine the usefulness of symmetry as a morphological parameter. Each galaxy image is rotated by 180° and subtracted from the original to obtain a quantitative value for its structural symmetry. The symmetry numbers computed for the sample are then compared with RC3 morphological types, color, and absolute blue magnitudes. A strong correlation between 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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