Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.214..449b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 214, June 1, 1985, p. 449-462.
Astronomy and Astrophysics
Astronomy
126
Disk Galaxies, Galactic Structure, Spheroids, Star Distribution, Astrodynamics, Astronomical Models, Bulging, Density Distribution, Distribution Functions
Scientific paper
The authors use a systematic approach to the choice of distribution functions to construct models of box-shaped spheroidal components. They argue that box-shaped bulges differ from elliptical spheroidal components in that in box-shaped systems, only a particular two-dimensional subset of the full three-dimensional continuum of possible orbits is heavily populated. This conjecture is tested by means of two families of distribution functions tailored to yield models with the same radial density profile as Henon's isochrone model. The rotation properties of models of the two families differ principally in that box-shaped models 'rotate on cylinders', in constrast to the more nearly spheroidal rotation characteristic of the elliptical models. This distinction is expected on general grounds and is in agreement with observation. It is argued that distribution functions of the type that generate box-shaped systems can arise either through the cannibalism of small galaxies by large, or through mergers of favourably inclined pairs of galaxies.
Binney James
Petrou Maria
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