Аннотация
Using 3D spectroscopy with a scanning Fabry-Perot interferometer, we study
the ionized gas kinematics in 58 nearby dwarf galaxies. Combining our results
with data from literature, we provide a global relation between the gas
velocity dispersion sigma and the star formation rate SFR and Halpha luminosity
for galaxies in a very broad range of star formation rates SFR=0.001-300 Mo/yr.
We find that the slope of the L\_Halpha - sigma relation for dwarf galaxies is
significantly different from that of large galaxies: L\_H= sigma**6.1 for
L\_H\alpha<1.e41erg/s as compared to L\_Halpha = sigma**2.7 for brighter
galaxies. We also find no correlation between sigma and the circular velocity
of galaxies V\_max. This implies that velocity dispersion of the ionized gas
does not reflect the virial motions in the gravitational potential of dwarf
galaxies, the view which was often suggested. We find that the ionized gas
turbulent motions are mainly determined by the energy injected into the
interstellar medium by the ongoing star formation.
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