Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..701c&link_type=abstract
Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 701-710.
Astronomy and Astrophysics
Astrophysics
15
Elliptical Galaxies, Many Body Problem, Star Distribution, Stellar Evolution, Stellar Rotation, Stellar Systems, Eigenvalues, Equations Of Motion, Galactic Structure, Hubble Constant
Scientific paper
The long term evolution of rotating stellar bars, arising from a bar instability in systems which do not satisfy the Ostriker-Peebles criterion, is studied using traditional (non-FFT) N-body techniques. A number of runs have been made with the same initial conditions but with different values of N (in the range 400-4000) and of the smoothing length of the potential. This allows estimation of what part of the results is affected by the N-body schematization and thus permits extrapolation of the results to a true stellar system. It is found that the secular evolution of the ideal collisionless bar appears to maintain the bar shape while increasing its rotation period. The increase of the period is quite slow (a factor of 2 in approximately 70 initial rotation periods); therefore, there is no problem, from this point of view, in identifying bars with elliptical galaxies, provided it is accepted that the pattern rotation velocity may substantially decrease in an Hubble time.
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