Rapid gas supply to a nuclear region by self-gravitational instability in a weak barred potential

Details Rapid gas supply to a nuclear region by self-gravitational instability in a weak barred potential Rapid gas supply to a nuclear region by self-gravitational instability in a weak barred potential

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258...82w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 1, Sept. 1, 1992, p. 82-94.

Other

92

Flow Stability, Galactic Nuclei, Gas Dynamics, Interacting Galaxies, Starburst Galaxies, Astronomical Models, Barred Galaxies, Two Dimensional Models

Scientific paper

Gas dynamics in a weak barred potential is studied with 2D numerical simulations taking into account self-gravity of gas to explain the mechanism of rapid gas inflow into the central region of a starburst galaxy. The gas is assumed to be initially uniformly distributed inside the corotation radius of the weak barred potential and pursue the self-gravitational gas motion in the case that the inner Lindblad resonance (ILR) exists in this potential. For an initial gas-to-stellar mass ratio greater than 10 percent, a central elongated gas ring becomes unstable and collapses after gas accumulates to form the elongated gas ring near the ILR radius. Dense gas clumps are formed at both sides of the elongated ring and collide with each other in a highly elongated orbit. After frequent collisions, these gas clumps merge and finally form a central dense core. As a result, a large amount of gas is concentrated in the center beyond the ILR radius in a dynamical time-scale after the ring formation.

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