SDSS-IV MaNGA: Enhanced Star Formation in Galactic-scale Outflows
  Using the integral field unit (IFU) data from Mapping Nearby Galaxies at
Apache Point Observatory (MaNGA) survey, we collect a sample of 36 star forming
galaxies that host galactic-scale outflows in ionized gas phase. The control
sample is matched in the three dimensional parameter space of stellar mass,
star formation rate and inclination angle. Concerning the global properties,
the outflows host galaxies tend to have smaller size, more asymmetric gas disk,
more active star formation in the center and older stellar population than the
control galaxies. Comparing the stellar population properties along axes, we
conclude that the star formation in the outflows host galaxies can be divided
into two branches. One branch evolves following the inside-out formation
scenario. The other locating in the galactic center is triggered by gas
accretion or galaxy interaction, and further drives the galactic-scale
outflows. Besides, the enhanced star formation and metallicity along minor axis
of outflows host galaxies uncover the positive feedback and metal entrainment
in the galactic-scale outflows. Observational data in different phases with
higher spatial resolution are needed to reveal the influence of galactic-scale
outflows on the star formation progress in detail.
