Statistics – Computation
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386...42r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 10, 1992, p. 42-51.
Statistics
Computation
9
Astronomical Models, Celestial Mechanics, Elliptical Galaxies, Galactic Structure, Isophotes, Astronomical Photometry, Brightness Distribution, Computational Astrophysics, Image Analysis
Scientific paper
Two families of models for the intrinsic light distribution of elliptical galaxies are presented; both families consist of a purely ellipsoidal light distribution with the addition of a secondary, nonellipsoidal light distribution which accounts for the isophotal distortion. In the first family, the nonellipsoidal distribution has isoluminosity surfaces in the shape of a box, or rectangular prism. These models may appear disky in projection (a4 is greater than 0) from a limited range of viewing angles. The skew component of the isophotal nonellipsoidal distortion (b4) may be comparable in amplitude to the a4 component. In the second family, the nonellipsoidal distribution is cylindrical. In these models, the isophotal distortion is boxy (a4 is less than 0). For both families, if a fraction of 0.16 of the total light is in the nonellipsoidal component, the resulting isophotal distortions are only at the 1-percent level.
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