SDSS IV MaNGA: Star-formation-driven Biconical Outflows in the Local Universe

Authors

Dmitry Bizyaev, Apache Point Observatory
Yan Mei Chen, Nanjing University
Yong Shi, Nanjing University
Rogemar A. Riffel, Laboratório Interinstitucional de e-Astronomia
Rogerio Riffel, Laboratório Interinstitucional de e-Astronomia
Aleksandar M. Diamond-Stanic, Bates CollegeFollow
Namrata Roy, University of California, Santa Cruz

Publication Title

Astrophysical Journal

Document Type

Article

Department or Program

Physics and Astronomy

Publication Date

9-2019

Keywords

Galaxies: Spiral-galaxies: Star formation-ism: Jets and outflows-ism: Kinematics and dynamics

Abstract

We present a sample of 48 nearby galaxies with central, biconical outflows identified by the Mapping Nearby Galaxies at APO survey. All considered galaxies have star-formation-driven biconical (SFB) central outflows, with no signs of an active galactic nucleus. 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 [/Fe] ratio in the gas. A 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% of 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.

Comments

Original version is available from the publisher at: https://doi.org/10.3847/1538-4357/ab3406

Recommended Citation

Bizyaev, D., Chen, Y.-M., Shi, Y., Riffel, R. A., Riffel, R., Diamond-Stanic, A. M., & Roy, N. (2019). SDSS IV MaNGA: Star-formation-driven Biconical Outflows in the Local Universe. The Astrophysical Journal, 882(2), 145–.