Outlying H$\alpha$ blobs in SDSS IV MaNGA
  We have discovered a population of 29 outlying H$\alpha$ emitters which
appear like unresolved blobs in the DR14 data release of the SDSS IV MaNGA
integral field unit survey. They do not have any underlying optical continuum
emission in deep imaging from the DECam Legacy Survey or Beijing-Arizona Sky
Survey. These blobs either lie away from the disc of the host galaxy in the
MaNGA IFU and/or have velocities which are different from the velocity map of
the host galaxy. Interestingly, all of them show photoionisation due to star
formation. These galaxies have very high specific star formation rates compared
to the known population of dwarf galaxies. However, their metallicities are
consistent with or even lower than those of the local volume dwarfs. Thus, we
can possibly rule out tidal dwarf galaxies. They could represent a new
population of low mass and starbursting dwarf galaxies.
