Densisty waves in gaseous mini-disks of NGC 4501 and NGC 6951

Details Densisty waves in gaseous mini-disks of NGC 4501 and NGC 6951 Densisty waves in gaseous mini-disks of NGC 4501 and NGC 6951

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..384o&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

Dense Stellar Systems

Scientific paper

We studied the gaseous mini-disks of the central regions of NGC 4501 and NGC 6951. Taking into account the observed properties of the molecular gas in the central region we built equilibrium models for both galaxies. These models are characterized by a gas-rich self-gravitating central region which is close to marginal stability measured by the Toomre parameter Q. The minimum Q-values are 1.2 and 0.8 for NGC 4501 and NGC 6951 respectively. In agreement with the expectation from linear analysis our hydrodynamical simulations showed that both mini-disks are gravitationally unstable. Moreover different to extended galactic disks multi-armed modes are dominant instead of low-m modes. This yields in a flocculent morphology which is in good agreement with the observed structures for both galaxies.

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