Self-consistent models for galactic halos

Details Self-consistent models for galactic halos Self-consistent models for galactic halos

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..563s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 2, p. 563-577.

Other

104

Astronomical Models, Galactic Halos, Galactic Rotation, Galactic Structure, Galactic Evolution, Stellar Motions

Scientific paper

Six triaxial nonrotating density models with various axis ratios were chosen to investigate the dynamics of galactic halos. Six-hundred orbits were integrated for each model over a time interval equivalent to about 55 orbital periods, or 1 Hubble time. Half of these orbits (mostly S-tubes, O-tubes, and I-tubes) were defined in the x-z start space, and the other half (primarily boxlets such as bananas, but also many unstable stochastic orbits) were defined in the stationary start space. Self-consistent equilibrium models were developed with the help of a 48 cell grid on the reference sphere and by using long sequences of Lucy iterations. Results indicate that self-consistent solutions exist in all six cases. Equilibrium considerations alone, without the consideration of possible instabilities or halo formation processes, are found to be insufficient to constrain the overall shape of galactic halos.

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