Box and peanut shapes generated by stellar bars

Details Box and peanut shapes generated by stellar bars Box and peanut shapes generated by stellar bars

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233...82c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 1, July 1990, p. 82-95. Research supported by the Universite de Genev

Astronomy and Astrophysics

Astrophysics

349

Barred Galaxies, Galactic Structure, Kinematic Equations, Computerized Simulation, Fast Fourier Transformations, Poisson Equation, Stellar Orbits, Stellar Systems

Scientific paper

By means of three-dimensional N-body simulations, it is found that all the stellar bars that develop in realistic models of collisionless disk galaxies take after some time a more or less pronounced peanut-shape when seen edge-on. According to the projection direction, the bar can also appear box-shaped or round. This morphology gradually appears after the bar has formed and reaches its maximum intensity when the bar is in a steady state; there is then a wide resonance zone corresponding to a marginal horizontal Inner Lindblad Resonance (ILR), and a distinct vertical ILR. Stars in this zone oscillate along orbits far from the plane, forming the peanut shape.

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