Authors: Jin He
Weakly interacted galaxies present very simple body structure. They are either three-dimensional objects resembling ellipsoids or flat-shaped disks showing spiral disturbance. Elliptical galaxies present little dust and gas but spiral galaxies demonstrate arms and rings which are characterized by containing a huge amount of dust and gas. Since arms and rings are linear-shaped, the body structure of spiral galaxies may be a textured one as earth-bound materials always are. This led to the concept of rational structure which is based on proportion curves. The proportion curves for normal spiral galaxies are all equiangular spirals which trace or cut through arms consistently. This paper demonstrates the spider-shaped proportion curves for barred spiral galaxies. It shows for the third galaxy NGC 6782 that the curves do trace or cut through arms or rings consistently. More examples of barred galaxies will be studied for the testification of Nature's rationality.
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