A generating mechanism of spiral structure in barred galaxies

Details A generating mechanism of spiral structure in barred galaxies A generating mechanism of spiral structure in barred galaxies

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..151t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 199, Apr. 1982, p. 151-169.

Astronomy and Astrophysics

Astronomy

9

Barred Galaxies, Density Wave Model, Disk Galaxies, Galactic Evolution, Galactic Structure, Spiral Galaxies, Angular Momentum, Body Kinematics, Equations Of Motion, Fourier Analysis, Galactic Rotation, Interstellar Gas, Perturbation Theory, Stellar Motions, Time Dependence

Scientific paper

The relation between the time-dependence of the bar-shaped perturbation in a barred galaxy and the resulting spiral structure is analyzed using a concept according to which the bar, after initial bar-forming instability, further increases in strength due to the fact that the spiral forced by the bar drains angular momentum from the bar. This hypothesis is consistent with N-body experiments. The behavior is simulated by a growing oval distortion that, after the initial increase, slowly approaches a limiting strength. The behavior of cold disks with the stars initially in purely circular motion is also investigated and the results compared with those found for the gas response to oval distortions. The linear cyclic approximation is used to estimate the stellar response to growing oval distortions analytically and also to develop some insight into the kinematical mechanisms that lead to the observed behavior.

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