Title：MaNGA survey: gas accretion in nearby galaxies

Speaker：Min Bao, Nanjing Normal University

Time: 10:00 am Feb. 5th (Thursday)    

Location: 19th floor, Galaxy Lecture Hall

Abstract：

Gas accretion, one of the most critical processes in galaxy evolution, supplies material for star formation and black hole growth. However, given that accretion typically occurs along the gas disk with low velocity, it is coupling with the disk rotation. To overcome this limitation, we constructed the largest observational sample to date — 496 galaxies with kinematically misaligned gas and stars from the MaNGA survey. The formation of these galaxies is widely attributed to external gas accretion, which can further trigger gas inflows. Using HI-MaNGA observations, we applied the curve-of-growth method to quantify the neutral hydrogen (HI) profiles of the misaligned sample. Our analysis reveals that gas accretion alters the cold gas distribution by driving gas inflows toward the galactic center. Furthermore, by comparing the gas and stellar spins of misaligned galaxies with the large-scale structure (LSS), we discovered a perpendicular spin-LSS correlation for the gas component — a trend absent in stellar spin. These findings indicate that the misaligned gas can be accreted from the large-scale environments.

CV：

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 in nearby galaxies, and the correlation between galaxy evolution and cosmic web.