Tidal disruption events can power the observed AGN in dwarf galaxies
  In recent years, numerous active galactic nuclei have been discovered in ever
smaller galaxies, questioning the paradigm that dwarf galaxies do not harbour
central massive black holes. Even if such black holes exist, feeding them by
gas streams is difficult, since star formation should be more efficient than
AGN feeding in dwarf galaxies. In this paper, I investigate the possibility
that tidal disruptions of stars are responsible for the observed AGN in dwarf
galaxies. I show that the expected duty cycles of TDE-powered AGN, $f_{\rm AGN}
\geq 0.5\%$, are consistent with observed AGN fractions assuming that the
occupation fraction in dwarf galaxies is close to unity. Furthermore, I
calculate the properties of outflows driven by TDE-powered AGN under idealised
conditions and find that they might have noticeable effects on the host
galaxies. Outflows themselves might not be detectable, except in gas-poor
galaxies, where they can accelerate to $v_{\rm out} > 100$~km/s, but increased
gas turbulence, more diffuse density profile and lower star formation
efficiency can be discovered and used to constrain the black hole occupancy
fraction and more nuanced effects on dwarf galaxy evolution. If massive black
holes form from seeds that are much more massive than stellar black holes, then
their outflows should be easily detectable; this result, aided by observations
of high-redshift dwarf galaxies, provides a potential way of determining seed
masses of black holes.
