SDSS-IV MaNGA: Evidence of the importance of AGN feedback in low-mass
  galaxies
  We present new evidence for AGN feedback in a subset of 69 quenched low-mass
galaxies ($M_{\star} \lesssim 5\times10^{9}$ M$_{\odot}$, $M_{\rm{r}} > -19$)
selected from the first two years of the SDSS-IV MaNGA survey. The majority (85
per cent) of these quenched galaxies appear to reside in a group environment.
We find 6 galaxies in our sample that appear to have an active AGN that is
preventing on-going star-formation; this is the first time such a feedback
mechanism has been observed in this mass range. Interestingly, five of these
six galaxies have an ionised gas component that is kinematically offset from
their stellar component, suggesting the gas is either recently accreted or
outflowing. We hypothesise these six galaxies are low-mass equivalents to the
"red geysers" observed in more massive galaxies. Of the other 63 galaxies in
the sample, we find 8 do appear for have some low-level, residual star
formation, or emission from hot, evolved stars. The remaining galaxies in our
sample have no detectable ionised gas emission throughout their structures,
consistent with them being quenched. This work shows the potential for
understanding the detailed physical properties of dwarf galaxies through
spatially resolved spectroscopy.
