  While in massive galaxies active galactic nuclei (AGN) feedback plays an
important role, the role of AGN feedback is still under debate in dwarf
galaxies. With well spatially resolved data obtained from the Multi-Unit
Spectroscopic Explorer (MUSE), we identify a spatially extended ($\rm \sim 3\;
kpc$) and fast ($V_{80} \sim 471\; \rm km\;s^{-1}$) AGN-driven outflow in a
dwarf galaxy: SDSS J022849.51-090153.8 with $M_{*} \sim 10^{9.6}\;{\rm
M_{\odot}}$ that host an intermediate-mass black hole of $M_{\rm BH} \sim
10^5\;{\rm M_{\odot}}$ and $L_{\rm AGN}/L_{\rm Edd} \sim 0.15$. Through the
measurement of the rotation curve, we estimate the escape velocity of the halo
and the ratio of the outflow velocity to the halo escape velocity to be
$1.09\pm0.04$, indicating that the outflow is capable of escaping not only the
galaxy disk but the halo. The outflow size of our AGN is found to be larger
than AGN in massive galaxies at the given AGN [O III] luminosity, while the
size of the photo-ionized narrow-line region is comparable. These results
suggest the important role of AGN feedback through outflows in dwarf galaxies
when their central intermediate-mass black holes accrete at high-Eddington
ratios.
