What powers the starburst activity of NGC 1068? Star-driven
  gravitational instabilities caught in the act
  We explore the role that gravitational instability plays in NGC 1068, a
nearby Seyfert galaxy that exhibits unusually vigorous starburst activity. For
this purpose, we use the Romeo-Falstad disc instability diagnostics and data
from BIMA SONG, SDSS and SAURON. Our analysis illustrates that NGC 1068 is a
gravitationally unstable "monster". Its starburst disc is subject to unusually
powerful instabilities. Several processes, including AGN/stellar feedback, try
to quench such instabilities from inside out by depressing the surface density
of molecular gas across the central kpc, but they do not succeed. Gravitational
instability "wins" because it is driven by the stars via their much higher
surface density. In this process, stars and molecular gas are strongly coupled,
and it is such a coupling that ultimately triggers local gravitational
collapse/fragmentation in the molecular gas.
