Speaker
Description
It is well-known that there is a correlation between the galaxy color/quiescence and the morphology. Especially, the more recent studies revealed a tight correlation between the central stellar mass surface density within 1 kpc and the total stellar mass for quiescent galaxies, which suggests that a dense core is an indicator for quenching. Therefore, the population of blue star-forming spiral galaxies with dense cores may represent rejuvenated systems. In this talk, I will introduce our work on exploring the nature of blue spirals with dense cores based on MaNGA data. By comparing with a sample of blue spirals with less dense cores, we find that the centers of blue spirals with dense cores are younger, alpha-element depressed and forming stars more actively. Furthermore, they show more asymmetric gas velocity fields. These results support the rejuvenation scenario for blue spirals with dense cores, which also strengthens the importance of a dense core for quenching.
