  We investigate the influence of star formation and instantaneous AGN feedback
processes on the ionized gas velocity dispersion in a sample of 1285
emission-line galaxies with stellar masses $\log\,(M_*/M_{\odot}) \geq 9$ from
the integral-field spectroscopy SAMI Galaxy Survey. We fit both narrow and
broad emission line components using aperture spectra integrated within one
effective radius, while ensuring the elimination of velocity differences
between the spectra of individual spaxels. Our analysis reveals that 386 (30%)
galaxies can be adequately described using a single emission component while
356 (28%) galaxies require two (broad and narrow) components. Galaxies
characterized by high mass, elevated star formation rate surface density, or
type-2 AGN-like emissions tend to feature an additional broad emission-line
component, leading to their classification as double-component galaxies. We
explore the correlations between $M_*$ and gas velocity dispersions,
highlighting that the prominence of the broad component significantly
contributes to elevating the gas velocity dispersion. Galaxies displaying
AGN-like emission based on optical definitions show enhanced gas velocity
dispersions. In star-forming galaxies, both stellar mass and star-formation
rate surface density substantially contribute to the velocity dispersion of the
narrow component. Increased star-forming activity appears to elevate the
velocity dispersion of the narrow component. The broad component exhibits a
weaker dependence on stellar mass and is primarily driven by galactic outflows.
We suggest that strong star forming activity leads to the formation of a broad
emission-line component, but the impact on inflating gas velocity dispersion is
moderate. On the other hand, AGN-driven outflows appear to be a more important
contributor to the elevated velocity dispersion of the ionized gas.
