Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249...68o&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 1, 1981, p. 68-75.
Astronomy and Astrophysics
Astrophysics
30
Brightness Distribution, Elliptical Galaxies, Flattening, Galactic Structure, Astronomical Models, Axes (Reference Lines), Oblate Spheroids, Prolate Spheroids, Spectrophotometry, Surface Properties
Scientific paper
The relation between apparent ellipticity and surface brightness for a sample of 112 normal, noninteracting, bright elliptical galaxies in the Second Reference Catalogue is used as a test of their intrinsic shapes. The observed trend is consistent with that expected from geometric projection effects for oblate spheroids, when it is assumed that intrinsic surface brightness, as viewed down the symmetry axis, is independent of the intrinsic axis ratio. Prolate models for elliptical galaxies cannot be ruled out, however, if the ad hoc hypothesis is made that a correlation strong enough to dominate the projection effects exists between intrinsic flattening and surface brightness.
de Vaucouleurs Gerard
Olson Donald W.
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