Elliptical galaxies often have isophotes that deviate slightly from pure ellipses. The 4-fold symmetric possibilities are "disky" and "boxy", as parameterized by a4 (positive for disky; negative for boxy).
Boxy and Disky Ellipticals |
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Elliptical galaxies often have isophotes that deviate slightly from pure ellipses. The 4-fold symmetric possibilities are "disky" and "boxy", as parameterized by a4 (positive for disky; negative for boxy). |