Title: Gas cycle between galaxies and cosmic web in the local universe

Speaker: 鲍敏

Institute: 南京师范大学

Host: 顾为民

Time: 2026.4.30 周四 14:30

Location: 物理楼 552

Abstract:

The gas cycle, which includes gas accretion (inflow) and galactic outflow, plays a critical role in galaxy evolution. A galaxy can accrete external gas, triggering gas inflow and providing fuel for star formation and black hole activity in the galactic center. In turn, intense star formation and black hole activity in the center can drive galactic outflow. We studied both gas accretion and galactic outflow in nearby galaxies using observations from MaNGA, ALMA, NOEMA, ALFALFA, and GBT, as well as the large‑scale structure from the ELUCID project. For gas accretion, we found that: (1) external gas is mainly accreted from the cosmic web; (2) it contributes to more centrally concentrated HI gas distributions; (3) it boosts efficient star formation; and (4) it triggers enhanced star formation and black hole activity in the galactic center. For galactic outflow, we found that: (1) intense star formation and molecular outflow can be connected via fast shocks; (2) galactic outflow contributes enriched metallicity and enhanced star formation to the host galaxies. As the starting process of the gas cycle, gas accretion can govern galaxy evolution. We also tried to determine the factors that dominate this process based on spin correlation for the gas component. It turns out that the cosmic environment is the dominant factor, followed by star formation activity. In contrast, the influence of halo mass is negligible. We conclude that while the cosmic web regulates the availability of gas supply, active star formation — likely through efficient feedback — is able to suppress further accretion.

Bio:

Min Bao obtained her PhD degree from Nanjing Normal University in 2022. During her PhD program, she was jointly educated at Nanjing University and the University of Tokyo. Since September 2022, she moved to Nanjing University to do postdoctoral research. In November 2025, Min joined School of Physics and Technology at Nanjing Normal University. Her research focuses on the gas cycle between galaxies and cosmic web, including gas accretion and galactic outflow.

Related papers:

https://ui.adsabs.harvard.edu/abs/2019MNRAS.490.3830B/abstract

https://ui.adsabs.harvard.edu/abs/2021MNRAS.505..191B/abstract

https://ui.adsabs.harvard.edu/abs/2024A%26A...687A..43B/abstract

https://ui.adsabs.harvard.edu/abs/2025ApJ...982L..29B/abstract

https://ui.adsabs.harvard.edu/abs/2025ApJ...993..149Z/abstract