Statistics – Computation
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..743r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Dec. 15, 1991, p. 743-752.
Statistics
Computation
9
Brightness Distribution, Computational Astrophysics, Elliptical Galaxies, Galactic Structure, Astronomical Models, Isophotes, Luminosity
Scientific paper
The formula for the projected surface brightness of an elliptical galaxy is derived under the assumption that the isoluminosity surfaces are coaxial ellipsoids, with axis ratios varying with radius. The surface brightness for a set of five model galaxies is computed explicitly; the models have luminosity profiles which are close to a de Vaucouleurs law and have smoothly varying axis ratios. Certain models show large isophote twists (up to 90 deg) from some viewing angles while showing negligible twists from other viewing angles. The projected isophotes usually show a discy distortion from a purely elliptical shape, but with an amplitude which is less than 0.5 percent in radius. The principal axes of the projected isophotes can stray far away from the projected principal axes of the isoluminosity ellipsoids.
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