  We present a sample of 48 nearby galaxies with central, biconical outflows
identified by the Mapping Nearby Galaxies at APO (MaNGA) survey. All considered
galaxies have star formation driven bi-conical central outflows (SFB), with no
signs of AGN. We find that the SFB outflows require high central concentration
of the star formation rate. This increases the gas velocity dispersion over the
equilibrium limit and helps maintain the gas outflows. The central starbursts
increase the metallicity, extinction, and the alpha/Fe ratio in the gas.
Significant amount of young stellar population at the centers suggests that the
SFBs are associated with the formation of young bulges in galaxies. More than
70% of SFB galaxies are group members or have companions with no prominent
interaction, or show asymmetry of external isophotes. In 15% SFB cases stars
and gas rotate in the opposite directions, which points at the gas infall from
satellites as the primary reason for triggering the SFB phenomena.

Astrophysics of Galaxies