A model is presented consisting of two different axially deformed polytropic spheroids, homocentric and coaxial - with arbitrary values for the two masses, the two equatorial radii, and the two polytropic indices - interacting with each other only gravitationally. The model represents the two main components, halo and bulge plus disk, of a galaxy. The flattening of the two spheroids is assumed to be due to rigid-body rotation and tidal interaction, and the treatment follows closely the method of Chandrasekhar and Lebovitz (1962) for single polytropic structures. All useful quantities are evaluated up to first order in the two rotation frequencies. The main properties of sequences of models intended to mimic evolution at constant masses and constant angular momenta are presented.
A polytropic model for a two-component galaxy
CAIMMI, ROBERTO;DALLAPORTA, NICOLO'
1978
Abstract
A model is presented consisting of two different axially deformed polytropic spheroids, homocentric and coaxial - with arbitrary values for the two masses, the two equatorial radii, and the two polytropic indices - interacting with each other only gravitationally. The model represents the two main components, halo and bulge plus disk, of a galaxy. The flattening of the two spheroids is assumed to be due to rigid-body rotation and tidal interaction, and the treatment follows closely the method of Chandrasekhar and Lebovitz (1962) for single polytropic structures. All useful quantities are evaluated up to first order in the two rotation frequencies. The main properties of sequences of models intended to mimic evolution at constant masses and constant angular momenta are presented.
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