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Gaseous flows in galaxies

Published online by Cambridge University Press:  01 July 2007

Francoise Combes
Francoise Combes*
Affiliation:
Observatoire de Paris, LERMA (CNRS:UMR8112), 61 Av. de l'Observatoire, 75014 Paris, France email: francoise.combes@obspm.fr
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Abstract

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The gas component plays a major role in the dynamics of spiral galaxies, because of its dissipative character, and its ability to exchange angular momentum with stars in the disk. Due to its small velocity dispersion, it triggers gravitational instabilities, and the corresponding non-axisymmetric patterns produce gravity torques, which mediate these angular momentum exchanges. When a srong bar pattern develops with the same pattern speed all over the disk, only gas inside corotation can flow towards the center. But strong bars are not long lived in presence of gas, and multiple-speed spiral patterns can develop between bar phases, and help the galaxy to accrete external gas flowing from cosmic filaments. The gas is then intermittently driven to the galaxy center, to form nuclear starbursts and fuel an active nucleus. The various time-scales of these gaseous flows are described.

Keywords

galaxies: spiral – galaxies: kinematics and dynamics – galaxies: interstellar matter – galaxies: bulges – galaxies: nuclei – galaxies: starburst – galaxies: interactions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 151 - 160
Copyright
Copyright © International Astronomical Union 2008

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