Dissipation in barred galaxies - The growth of bulges and central mass concentrations

Details Dissipation in barred galaxies - The growth of bulges and central mass concentrations Dissipation in barred galaxies - The growth of bulges and central mass concentrations

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...363..391p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 10, 1990, p. 391-410. Research supported by SNSF.

Statistics

Computation

273

Barred Galaxies, Disk Galaxies, Galactic Bulge, Galactic Mass, Active Galactic Nuclei, Computational Astrophysics, Galactic Evolution, Galactic Structure, Time Dependence

Scientific paper

Basic dynamical mechanisms that produce an amplification of the accretion rate of gas clouds into the central regions of barred galaxies, and their subsequent effects on the evolution of barred galaxies, are discussed. Weakly dissipative orbits, representing gas clouds, are computed in a barred galaxy model with a central mass concentration such as a black hole, or a secondary small inner bar. Amplified accretion across resonances that is especially rapid inside the inner Lindblad resonance, large excursions outside the galactic plane, and the existence of nontrivial attractors like strange (chaotic) attractors or limit cycles are found. The underlying physical mechanisms are, in general, due to the presence of broad horizontal and vertical resonances through which weakly dissipative particles can rapidly traverse. The principal physical implications of these findings are discussed.

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