# SDSS IV MaNGA -- Star-Formation Driven Biconical Outflows in the Local Univers

## TL;DR

This study identifies 48 nearby galaxies with star formation driven biconical outflows, revealing their properties, triggers, and implications for galaxy evolution, especially in relation to starbursts and minor interactions.

## Contribution

First comprehensive analysis of star formation driven biconical outflows in local galaxies using MaNGA data, highlighting their characteristics and origins.

## Key findings

- High central star formation concentration is essential for outflows.
- Outflows increase gas velocity dispersion and metallicity.
- Most outflow galaxies are in groups or have minor companions.

## Abstract

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.